Prosecution Insights
Last updated: April 19, 2026
Application No. 18/350,522

OPTICAL ELEMENT FOR REFLECTING RADIATION, AND OPTICAL ASSEMBLY

Final Rejection §103
Filed
Jul 11, 2023
Examiner
GASSEN, CHRISTOPHER J
Art Unit
2881
Tech Center
2800 — Semiconductors & Electrical Systems
Assignee
Carl Zeiss Smt GmbH
OA Round
2 (Final)
80%
Grant Probability
Favorable
3-4
OA Rounds
2y 11m
To Grant
99%
With Interview

Examiner Intelligence

Grants 80% — above average
80%
Career Allow Rate
105 granted / 131 resolved
+12.2% vs TC avg
Strong +24% interview lift
Without
With
+24.3%
Interview Lift
resolved cases with interview
Typical timeline
2y 11m
Avg Prosecution
29 currently pending
Career history
160
Total Applications
across all art units

Statute-Specific Performance

§101
2.9%
-37.1% vs TC avg
§103
42.5%
+2.5% vs TC avg
§102
17.5%
-22.5% vs TC avg
§112
32.6%
-7.4% vs TC avg
Black line = Tech Center average estimate • Based on career data from 131 resolved cases

Office Action

§103
DETAILED ACTION Notice of Pre-AIA or AIA Status The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA . Response to Amendment The amendments filed 12/22/2025 have been entered. Claim 18 has been canceled. Claim 21 has been added. Claims 1-17 and 19-21 are now pending in the application. Response to Arguments Applicant’s amendments to the drawings and specification have overcome each and every objection previously set forth in the Non-Final Office Action dated 09/23/2025, hereinafter NFOA0923. Applicant’s amendments to the claims have overcome each and every objection previously set forth in NFOA0923. Applicant’s amendments to the claims have overcome each and every 35 U.S.C. 112(b) rejection previously set forth in NFOA0923. Applicant’s amendments to the claim have overcome the previously presented prior art rejection of claim 1 via the addition of the limitations “for a first cooling channel of the plurality of cooling channels: the first channel forms a first depression into the first partial body; the first channel forms a second depression into the second partial body”, which is not disclosed by Nienhuys. However, further search and consideration of the prior art identified disclosure the limitations. See discussion below. Claim Objections Claim 5 is objected to because of the following informalities: Claim 5 has a colon between two clauses (i.e., before ‘and/or’), which it appears should be a semi-colon. Appropriate correction is required. Claim Rejections - 35 USC § 103 In the event the determination of the status of the application as subject to AIA 35 U.S.C. 102 and 103 (or as subject to pre-AIA 35 U.S.C. 102 and 103) is incorrect, any correction of the statutory basis (i.e., changing from AIA to pre-AIA ) for the rejection will not be considered a new ground of rejection if the prior art relied upon, and the rationale supporting the rejection, would be the same under either status. The following is a quotation of 35 U.S.C. 103 which forms the basis for all obviousness rejections set forth in this Office action: A patent for a claimed invention may not be obtained, notwithstanding that the claimed invention is not identically disclosed as set forth in section 102, if the differences between the claimed invention and the prior art are such that the claimed invention as a whole would have been obvious before the effective filing date of the claimed invention to a person having ordinary skill in the art to which the claimed invention pertains. Patentability shall not be negated by the manner in which the invention was made. Claims 1-2, 12-14, 16-17, and 19-21 are rejected under 35 U.S.C. 103 as being unpatentable over Nienhuys (U.S. PGPub. No. US 20180239252 A1) in view of Phillips (U.S. PGPub. No. US 20070091485 A1). Regarding claim 1, Nienhuys teaches an optical element configured to reflect radiation (Abstract; [0115]), the optical element comprising: a substrate comprising a first partial body and a second partial body (See Figs. 5-7, substrate formed by items 4 and 8, respectively) joined at an interface (See interface between items 4 and 8; [0124]); a reflective coating ([0115], metallic layer) supported by a surface of the first partial body (See Figs. 5-7, item 5 supported by top surface of item 4; [0022]; [0115]; [0167]); a plurality of cooling channels (See Figs. 5-7, items 10) in the substrate in a region of the interface below the surface supporting the reflective coating (See Figs. 5-7, items 10, and in particular Fig. 6 showing the channels 10 in the substrate 4/8 below the top surface of item 4; [0120]); a distributor (See Figs. 5-6, item 12) in the substrate and configured to connect a coolant inlet to the plurality of cooling channels (See Figs. 5-6, items 10, 12 connected within the substrate 4/8; [0120]); and a collector (See Figs. 5-6, item 14) in the substrate and configured to connect the plurality of cooling channels to a coolant outlet (See Figs. 5-6, items 10, 14 connected within the substrate 4/8; [0120]), wherein: at least one member selected from the group consisting of the distributor and the collector (See Figs. 5-6, items 12 and/or 14) extends, proceeding from the interface, further into the second partial body of the substrate than into the first partial body of the substrate (See Figs. 5-6, items 12, 14, each of which extend from the interface of 4 and 8 further into item 8 than into 4; [0120]); Nienhuys does not teach for a first cooling channel of the plurality of cooling channels: the first channel forms a first depression into the first partial body; the first channel forms a second depression into the second partial body. Phillips teaches for a first cooling channel of the plurality of cooling channels: the first channel forms a first depression into the first partial body (See Fig. 9C; [0070]-[0073]); the first channel forms a second depression into the second partial body (See Fig. 9C; [0070]-[0073]). It would have been obvious to one of ordinary skill in the art before the effective filing date of the claimed invention to have modified Nienhuys to include for a first cooling channel of the plurality of cooling channels: the first channel forms a first depression into the first partial body; the first channel forms a second depression into the second partial body, or in other words, the concept of dividing a cooling channel into both the body of the reflective portion of the substrate and into body of the supporting part of the substrate, as taught by Phillips. Doing so represents combining known prior art elements according to known methods in order to achieve predictable results, and would allow one to spread the size of the channel into both the bodies to prevent increasing the thickness of mirror to achieve adequate cooing, as discussed in Phillips. Regarding claim 2, Nienhuys in view of Phillips teaches the optical element of claim 1. Nienhuys further teaches wherein the at least one member, in a portion of the second body proceeding from the interface, is aligned at an angle of at most 30° relative to a thickness direction of the substrate (See Figs. 5-7, items 12, 14 proceeding from interface of 4 and 8 toward second partial body 8; Examiner notes that ‘at most 30° relative to a thickness direction of the substrate’ is understood to mean less than or equal to 30°, and thus 0° satisfies the limitation). Regarding claim 12, Nienhuys in view of Phillips teaches the optical element of claim 1. Nienhuys further teaches wherein: the coolant inlet is in the second partial body; the coolant outlet is in the second partial body (See Figs. 5-6, items 12, 14, both disposed in second partial body 8); the coolant inlet is in a third partial body of the substrate; or the coolant outlet is in a third partial body of the substrate. Regarding claim 13, Nienhuys in view of Phillips teaches the optical element of claim 1. Phillips further teaches wherein the surface supporting the reflective coating is curved, and/or wherein the cooling channel is curved (See Figs 3A-3D; [0051]-[0052]; [0055]). Regarding claim 14, Nienhuys in view of Phillips teaches the optical element of claim 13. Nienhuys further teaches wherein the cooling channel is a constant spacing from the surface supporting the reflective coating (See Figs. 5-7, wherein 10 are a constant spacing from upper surface of 4). However, Nienhuys does not explicitly teach cooling channels being a constant spacing from a curved surface in particular. Thus, for completeness, Examiner notes, Phillips further teaches, for a curved surface, wherein the cooling channel is a constant spacing from the surface supporting the reflective coating (See Figs. 3A and 3B, items 308, 318; [0054]-[0055]). Regarding claim 16, Nienhuys in view of Phillips teaches the optical element of claim 1. Nienhuys further teaches wherein the radiation comprises EUV radiation ([0047]; [0067]; [0077]-[0078]; [0115]; [0173]-[0174]). Regarding claim 17, Nienhuys in view of Phillips teaches an optical arrangement (Nienhuys: [0115]), comprising: the optical element according to claim 1 (See claim 1 for mapping); and a cooling device configured to provide a coolant to the plurality of cooling channels (Nienhuys: [0122]-[0126]; [0165]-[0166]). Regarding claim 19, Nienhuys in view of Phillips teaches an apparatus, comprising: an optical arrangement (Nienhuys: [0115]), comprising: the optical element according to claim 1 (See claim 1 for mapping); and a cooling device configured to provide a coolant to the plurality of cooling channels (Nienhuys: [0122]-[0126]; [0165]-[0166]), wherein the apparatus is a lithography projection exposure apparatus (Nienhuys: [0002]-[0004]; [0036]; [0040]; [0045]). Regarding claim 20, Nienhuys in view of Phillips teaches the apparatus of claim 19. Nienhuys further teaches wherein the radiation comprises EUV radiation ([0047]; [0067]; [0077]-[0078]; [0115]; [0173]-[0174]). Regarding claim 21, Nienhuys in view of Phillips teaches the optical element of claim 1. Phillips further teaches wherein the interface is planar (See Figs. 3C-3D and Fig. 9C, where the interface is planar), and the first cooling channel is curved (See Figs. 4-6, showing the cooling channels curving in the plane of the mirror, wherein Figs. 8-9 show cross sectional views of the curved cooling channels). Claims 3-11 and 15 are rejected under 35 U.S.C. 103 as being unpatentable over Nienhuys (U.S. PGPub. No. US 20180239252 A1) in view of Phillips (U.S. PGPub. No. US 20070091485 A1) and Taylor (USPN US 5168924 A). Regarding claim 3, Nienhuys in view of Phillips teaches the optical element of claim 1. Nienhuys does not explicitly teach wherein: a partial region of the surface is not covered by the reflective coating; and the at least one member, in a portion proceeding from the interface, is below the partial region of the surface that is not covered by the reflective coating. However, Nienhuys does discuss the incident radiation not covering the whole of the surface covered by the reflective coating, despite Nienhuys not disclosing having a partial region of the surface not being covered by the reflective coating. Taylor also does not explicitly teach a partial region of the surface is not covered by the reflective coating and the at least one member, in a portion proceeding from the interface, is below a partial region of the surface that is not covered by the reflective coating (Emphases added by Examiner), however, Taylor discloses the coolant flow in the distributor/collector being disposed such that they “extend beyond the active area of the faceplate so that any coolant flow-induced distortions of the faceplate will be in a non-critical area” (Col. 6, Lines 38-48). This disclosure of Taylor achieves the same goal sought by these limitations of the instant application in the same way, despite not disclosing a partial region of the surface that is not covered by the reflective coating. Furthermore, one of ordinary skill in the art would be reasonably apprised of various conventional thin film coating techniques to dispose a coating on only a desired portion of a substrate/target (e.g. masking, blanking), and could readily dispose the reflective coating on only a portion of the surface which is to be irradiated without the use of inventive activity. Such a modification amounts to a mere change in size of the coating, however, a change in size is generally recognized as being within the level of ordinary skill in the art. In re Rose, 105 USPQ 237 (CCPA 1955). As such, it is Examiner’s opinion that it would have been obvious to one of ordinary skill in the art before the effective filing date of the claimed invention to have modified Nienhuys to include the teachings of Taylor to achieve ‘any coolant flow-induced distortions of the faceplate being in a non-critical area’, in order to achieve a partial region of the surface is not covered by the reflective coating and the at least one member, in a portion proceeding from the interface, is below a partial region of the surface that is not covered by the reflective coating (Emphasis added by Examiner), as changing the size of the reflective coating is an obvious modification to an ordinarily skilled artisan, and as Nienhuys indicates mitigating distortions of the reflector (see [0003]-[0004]) as a major goal of their invention, including by the use of cooling liquid flow as discussed above. Doing so represents combining known prior art elements according to known methods in order to achieve predictable results, and would allow one to further mitigate distortion in the reflective surface of the reflector of Nienhuys via the placement of the distributor/collector outside of the active area of the reflector which receives the incident radiation as taught by Taylor. Regarding claim 4, Nienhuys in view of Phillips teaches the optical element of claim 1. Nienhuys does not teach wherein the distributor comprises a distributor chamber which widens from the coolant inlet, and/or wherein the collector comprises a collecting chamber which tapers toward the coolant outlet. Taylor teaches wherein the distributor comprises a distributor chamber which widens from the coolant inlet, and/or wherein the collector comprises a collecting chamber which tapers toward the coolant outlet (See Figs. 5-8, items 48 or 68, which taper toward coolant outlet 28 and/or items 40 which widen from coolant inlet 26; Abstract; Col. 6, Line 12 – Col. 7, Line 19). It would have been obvious to one of ordinary skill in the art before the effective filing date of the claimed invention to have modified Nienhuys to include wherein the distributor comprises a distributor chamber which widens from the coolant inlet, and/or wherein the collector comprises a collecting chamber which tapers toward the coolant outlet, as taught by Taylor. Doing so represents combining known prior art elements according to known methods in order to achieve predictable results, and would allow one to mitigate distortions of the reflector, as discussed by Taylor in Col. 6, Lines 38-48, and as indicated to be desirable by Nienhuys in [0003]-[0004]. Regarding claim 5, Nienhuys in view of Phillips teaches the optical element of claim 1. Nienhuys does not teach wherein: the distributor comprises a distributor chamber which widens from the coolant inlet, and the distributor chamber extends from the coolant inlet to the interface: and/or the collector comprises a collecting chamber which tapers toward the coolant outlet, and the collecting chamber extends from the interface to the coolant outlet. Taylor teaches wherein: the distributor comprises a distributor chamber which widens from the coolant inlet (See Figs. 5-8, items 40 which widen from coolant inlet 26; Abstract; Col. 6, Line 12 – Col. 7, Line 19), and the distributor chamber extends from the coolant inlet to the interface (See Figs. 5-8, items 40 which extend from interface of item 22 and upper portion of substrate part 24 toward coolant inlet 26; Col. 6, Line 12 – Col. 7, Line 19): and/or the collector comprises a collecting chamber which tapers toward the coolant outlet (See Figs. 5-8, items 48 or 68, which taper toward coolant outlet 28; Abstract; Col. 6, Line 12 – Col. 7, Line 19), and the collecting chamber extends from the interface to the coolant outlet (See Figs. 5-8, items 68 which extend from seam 65 toward coolant outlet 28; Col. 6, Line 12 – Col. 7, Line 19). Doing so represents combining known prior art elements according to known methods in order to achieve predictable results, and would allow one to mitigate distortions of the reflector, as discussed by Taylor in Col. 6, Lines 38-48, and as indicated to be desirable by Nienhuys in [0003]-[0004]. Regarding claim 6, Nienhuys in view of Phillips teaches the optical element of claim 1. Nienhuys further teaches wherein the at least one member (See Figs. 5-6, items 12 and/or 14) comprises a portion which proceeds from the interface and comprises connecting channel(See Figs. 5-6, items 12, 14 proceed from the interface of 4 and 8 and includes a channel (i.e., in the u direction as shown in Figs. 5-6) which connects the cooling channels 10 to the inlet/outlet (i.e., the ends of the channels of 12 and/or 14); [0120]). Nienhuys does not explicitly teach wherein the at least one member comprises a portion which proceeds from the interface and comprises connecting channels configured to connect at least one cooling channel to the coolant inlet or to the coolant outlet (Emphasis added by Examiner), and rather teaches one respective connecting channel on each of the inlet and outlet. Taylor teaches wherein the at least one member comprises a portion which proceeds from the interface and comprises connecting channels configured to connect at least one cooling channel to the coolant inlet or to the coolant outlet (See Figs. 5-8, items 38, 40, 48, 58, 60, 68, wherein several connecting channels connect between cooling channels 46 and/or 64 and coolant inlet/outlet 26/28; Examiner notes each of these items could be interpreted as satisfying the limitation under the broadest reasonable interpretation; Col. 6, Line 12 – Col. 7, Line 19). It would have been obvious to one of ordinary skill in the art before the effective filing date of the claimed invention to have modified Nienhuys to include wherein the at least one member comprises a portion which proceeds from the interface and comprises connecting channels configured to connect at least one cooling channel to the coolant inlet or to the coolant outlet (Emphasis added by Examiner), as taught by Taylor. Doing so represents combining known prior art elements according to known methods in order to achieve predictable results, and would allow one, as taught by Taylor, to control the cooling fluid flow within the substrate in order to reduce distortions in the reflective surface, as indicated to be desirable by Nienhuys in [0003]-[0004]. Regarding claim 7, Nienhuys in view of Phillips and Taylor teaches the optical element of claim 6. Nienhuys further teaches wherein a connecting channel is connected to at least two cooling channels (See Figs. 5-6, items 12, 14 connecting to a plurality of cooling channels 10; [0120]). Regarding claim 8, Nienhuys in view of Phillips and Taylor teaches the optical element of claim 6. Taylor further teaches wherein a cross section of a connecting channel decreases from the interface (See Figs. 5-8, items 40 and/or 68, each of which have a cross section that decreases from interface (either between 22 and substrate or from 65); Col. 6, Line 12 – Col. 7, Line 19). Regarding claim 9, Nienhuys in view of Phillips teaches the optical element of claim 1. Nienhuys does not teach wherein: the distributor comprises a portion which proceeds from the interface, the portion of the distributor which proceeds from the interface comprises connecting channels configured to connect at least one cooling channel to the coolant inlet, and the distributor comprises a distributor chamber connected to the portion of the distributor having the connecting channels; or the collector comprises a portion which proceeds from the interface, the portion of the collector which proceeds from the interface comprises connecting channels configured to connect at least one cooling channel to the coolant outlet, and the collector comprises a collecting chamber connected to the portion of the collector that has the connecting channels. Taylor teaches wherein: the distributor comprises a portion which proceeds from the interface, the portion of the distributor which proceeds from the interface comprises connecting channels configured to connect at least one cooling channel to the coolant inlet, and the distributor comprises a distributor chamber connected to the portion of the distributor having the connecting channels (See Figs. 5-8, items 48 or 68 and/or 40, being connected to items 38, 58, 60; Col. 6, Line 12 – Col. 7, Line 19); or the collector comprises a portion which proceeds from the interface, the portion of the collector which proceeds from the interface comprises connecting channels configured to connect at least one cooling channel to the coolant outlet, and the collector comprises a collecting chamber connected to the portion of the collector that has the connecting channels (See Figs. 5-8, items 48 or 68 and/or 40, being connected to items 38, 58, 60; Col. 6, Line 12 – Col. 7, Line 19). It would have been obvious to one of ordinary skill in the art before the effective filing date of the claimed invention to have modified Nienhuys to include wherein: the distributor comprises a portion which proceeds from the interface, the portion of the distributor which proceeds from the interface comprises connecting channels configured to connect at least one cooling channel to the coolant inlet, and the distributor comprises a distributor chamber connected to the portion of the distributor having the connecting channels; or the collector comprises a portion which proceeds from the interface, the portion of the collector which proceeds from the interface comprises connecting channels configured to connect at least one cooling channel to the coolant outlet, and the collector comprises a collecting chamber connected to the portion of the collector that has the connecting channels, as taught by Taylor Doing so represents combining known prior art elements according to known methods in order to achieve predictable results, and would allow one to mitigate distortions of the reflector, as discussed by Taylor in Col. 6, Lines 38-48, and as indicated to be desirable by Nienhuys in [0003]-[0004]. Regarding claim 10, Nienhuys in view of Phillips teaches the optical element of claim 1. Nienhuys does not teach wherein: the distributor comprises a portion which proceeds from the interface, the portion of the distributor which proceeds from the interface comprises connecting channels configured to connect at least one cooling channel to the coolant inlet, the distributor comprises a distributor chamber connected to the portion of the distributor having the connecting channels, and the distributor chamber extends along a further interface between the second partial body and a third partial body of the substrate that is joined with the second partial body at the further interface; or the collector comprises a portion which proceeds from the interface, the portion of the collector which proceeds from the interface comprises connecting channels configured to connect at least one cooling channel to the coolant outlet, the collector comprises a collecting chamber connected to the portion of the distributor having the connecting channels, and the collecting chamber extends along a further interface between the second partial body and a third partial body of the substrate that is joined with the second partial body at the further interface. Taylor teaches wherein: the distributor comprises a portion which proceeds from the interface, the portion of the distributor which proceeds from the interface comprises connecting channels configured to connect at least one cooling channel to the coolant inlet, the distributor comprises a distributor chamber connected to the portion of the distributor having the connecting channels (See Figs. 5-8, items 48 or 68 and/or 40, being connected to items 38, 58, 60; Col. 6, Line 12 – Col. 7, Line 19), and the distributor chamber extends along a further interface between the second partial body and a third partial body of the substrate that is joined with the second partial body at the further interface (See Figs. 5-8, in particular items 22, 24 or 65, 66 and the coolant distribution elements running therethrough; Col. 6, Line 12 – Col. 7, Line 19); or the collector comprises a portion which proceeds from the interface, the portion of the collector which proceeds from the interface comprises connecting channels configured to connect at least one cooling channel to the coolant outlet, the collector comprises a collecting chamber connected to the portion of the distributor having the connecting channels (See Figs. 5-8, items 48 or 68 and/or 40, being connected to items 38, 58, 60; Col. 6, Line 12 – Col. 7, Line 19), and the collecting chamber extends along a further interface between the second partial body and a third partial body of the substrate that is joined with the second partial body at the further interface (See Figs. 5-8, in particular items 22, 24 or 65, 66 and the coolant distribution elements running therethrough; Col. 6, Line 12 – Col. 7, Line 19). It would have been obvious to one of ordinary skill in the art before the effective filing date of the claimed invention to have modified Nienhuys to include wherein: the distributor comprises a portion which proceeds from the interface, the portion of the distributor which proceeds from the interface comprises connecting channels configured to connect at least one cooling channel to the coolant inlet, the distributor comprises a distributor chamber connected to the portion of the distributor having the connecting channels, and the distributor chamber extends along a further interface between the second partial body and a third partial body of the substrate that is joined with the second partial body at the further interface; or the collector comprises a portion which proceeds from the interface, the portion of the collector which proceeds from the interface comprises connecting channels configured to connect at least one cooling channel to the coolant outlet, the collector comprises a collecting chamber connected to the portion of the distributor having the connecting channels, and the collecting chamber extends along a further interface between the second partial body and a third partial body of the substrate that is joined with the second partial body at the further interface, as taught by Taylor. Doing so represents combining known prior art elements according to known methods in order to achieve predictable results, and would allow one to mitigate distortions of the reflector, as discussed by Taylor in Col. 6, Lines 38-48, and as indicated to be desirable by Nienhuys in [0003]-[0004]. Examiner additionally notes that Nienhuys discloses the use of additional partial bodies and cooling channels therein (See Figs. 8-9 and supporting description). Regarding claim 11, Nienhuys in view of Phillips teaches the optical element of claim 1. Nienhuys does not teach wherein: the distributor comprises a portion which proceeds from the interface, the portion of the distributor which proceeds from the interface comprises connecting channels configured to connect at least one cooling channel to the coolant inlet, and the connecting channels of the distributor open into a common inlet channel which is connected to the coolant inlet; or the collector comprises a portion which proceeds from the interface, the portion of the collector which proceeds from the interface comprises connecting channels configured to connect at least one cooling channel to the coolant outlet, and the connecting channels of the collector open into a common outlet channel which is connected to the coolant outlet. Taylor teaches wherein: the distributor comprises a portion which proceeds from the interface, the portion of the distributor which proceeds from the interface comprises connecting channels configured to connect at least one cooling channel to the coolant inlet (See Figs. 5-8, items 48 or 68 and/or 40, being connected to items 38, 58, 60; Col. 6, Line 12 – Col. 7, Line 19), and the connecting channels of the distributor open into a common inlet channel which is connected to the coolant inlet (See Figs. 5-8, items 34, 52, 56 and/or 74; Col. 6, Line 12 – Col. 7, Line 19); or the collector comprises a portion which proceeds from the interface, the portion of the collector which proceeds from the interface comprises connecting channels configured to connect at least one cooling channel to the coolant outlet (See Figs. 5-8, items 48 or 68 and/or 40, being connected to items 38, 58, 60; Col. 6, Line 12 – Col. 7, Line 19), and the connecting channels of the collector open into a common outlet channel which is connected to the coolant outlet (See Figs. 5-8, items 34, 52, 56 and/or 74; Col. 6, Line 12 – Col. 7, Line 19). It would have been obvious to one of ordinary skill in the art before the effective filing date of the claimed invention to have modified Nienhuys to include wherein: the distributor comprises a portion which proceeds from the interface, the portion of the distributor which proceeds from the interface comprises connecting channels configured to connect at least one cooling channel to the coolant inlet, and the connecting channels of the distributor open into a common inlet channel which is connected to the coolant inlet; or the collector comprises a portion which proceeds from the interface, the portion of the collector which proceeds from the interface comprises connecting channels configured to connect at least one cooling channel to the coolant outlet, and the connecting channels of the collector open into a common outlet channel which is connected to the coolant outlet, as taught by Taylor. Doing so represents combining known prior art elements according to known methods in order to achieve predictable results, and would allow one to mitigate distortions of the reflector, as discussed by Taylor in Col. 6, Lines 38-48, and as indicated to be desirable by Nienhuys in [0003]-[0004]. Regarding claim 15, Nienhuys in view of Phillips teaches the optical element of claim 13. Nienhuys further teaches wherein the at least one member (See Figs. 5-6, items 12 and/or 14) comprises a portion which proceeds from the interface and comprises connecting channel(See Figs. 5-6, items 12, 14 proceed from the interface of 4 and 8 and includes a channel (i.e., in the u direction as shown in Figs. 5-6) which connects the cooling channels 10 to the inlet/outlet (i.e., the ends of the channels of 12 and/or 14); [0120]). Nienhuys does not explicitly teach wherein the at least one member comprises a portion which proceeds from the interface and comprises connecting channels configured to connect at least one cooling channel to the coolant inlet or to the coolant outlet (Emphasis added by Examiner), and rather teaches one respective connecting channel on each of the inlet and outlet. Taylor further teaches wherein the at least one member comprises a portion which proceeds from the interface and comprises connecting channels configured to connect at least one cooling channel to the coolant inlet or to the coolant outlet (See Figs. 5-8, items 38, 40, 48, 58, 60, 68, wherein several connecting channels connect between cooling channels 46 and/or 64 and coolant inlet/outlet 26/28; Examiner notes each of these items could be interpreted as satisfying the limitation under the broadest reasonable interpretation; Col. 6, Line 12 – Col. 7, Line 19). It would have been obvious to one of ordinary skill in the art before the effective filing date of the claimed invention to have modified Nienhuys to include wherein the at least one member comprises a portion which proceeds from the interface and comprises connecting channels configured to connect at least one cooling channel to the coolant inlet or to the coolant outlet (Emphasis added by Examiner), as taught by Taylor. Doing so represents combining known prior art elements according to known methods in order to achieve predictable results, and would allow one, as taught by Taylor, to control the cooling fluid flow within the substrate in order to reduce distortions in the reflective surface, as indicated to be desirable by Nienhuys in [0003]-[0004]. Conclusion Applicant's amendment necessitated the new ground(s) of rejection presented in this Office action. Accordingly, THIS ACTION IS MADE FINAL. See MPEP § 706.07(a). Applicant is reminded of the extension of time policy as set forth in 37 CFR 1.136(a). A shortened statutory period for reply to this final action is set to expire THREE MONTHS from the mailing date of this action. In the event a first reply is filed within TWO MONTHS of the mailing date of this final action and the advisory action is not mailed until after the end of the THREE-MONTH shortened statutory period, then the shortened statutory period will expire on the date the advisory action is mailed, and any nonprovisional extension fee (37 CFR 1.17(a)) pursuant to 37 CFR 1.136(a) will be calculated from the mailing date of the advisory action. In no event, however, will the statutory period for reply expire later than SIX MONTHS from the mailing date of this final action. Any inquiry concerning this communication or earlier communications from the examiner should be directed to CHRISTOPHER J GASSEN whose telephone number is (571)272-4363. The examiner can normally be reached M-F 9-5. Examiner interviews are available via telephone, in-person, and video conferencing using a USPTO supplied web-based collaboration tool. To schedule an interview, applicant is encouraged to use the USPTO Automated Interview Request (AIR) at http://www.uspto.gov/interviewpractice. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, ROBERT H KIM can be reached at (571)272-2293. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of published or unpublished applications may be obtained from Patent Center. Unpublished application information in Patent Center is available to registered users. To file and manage patent submissions in Patent Center, visit: https://patentcenter.uspto.gov. Visit https://www.uspto.gov/patents/apply/patent-center for more information about Patent Center and https://www.uspto.gov/patents/docx for information about filing in DOCX format. For additional questions, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). If you would like assistance from a USPTO Customer Service Representative, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. /CHRISTOPHER J GASSEN/ Examiner, Art Unit 2881 /MICHAEL J LOGIE/ Primary Examiner, Art Unit 2881
Read full office action

Prosecution Timeline

Jul 11, 2023
Application Filed
Sep 17, 2025
Non-Final Rejection — §103
Dec 22, 2025
Response Filed
Dec 22, 2025
Examiner Interview Summary
Mar 04, 2026
Final Rejection — §103 (current)

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Prosecution Projections

3-4
Expected OA Rounds
80%
Grant Probability
99%
With Interview (+24.3%)
2y 11m
Median Time to Grant
Moderate
PTA Risk
Based on 131 resolved cases by this examiner. Grant probability derived from career allow rate.

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