Prosecution Insights
Last updated: July 17, 2026
Application No. 18/461,094

FILTER ELEMENT, FILTER ELEMENT ARRANGEMENT, AND FILTER SYSTEM WITH A FILTER ELEMENT ARRANGEMENT

Final Rejection §102§103
Filed
Sep 05, 2023
Priority
Mar 04, 2021 — DE 10 2021 105 231.9 +1 more
Examiner
MILLER-CRUZ, EKANDRA S.
Art Unit
1773
Tech Center
1700 — Chemical & Materials Engineering
Assignee
Mann+hummel GmbH
OA Round
2 (Final)
66%
Grant Probability
Favorable
3-4
OA Rounds
0m
Est. Remaining
99%
With Interview

Examiner Intelligence

Grants 66% — above average
66%
Career Allowance Rate
222 granted / 339 resolved
+0.5% vs TC avg
Strong +52% interview lift
Without
With
+52.2%
Interview Lift
resolved cases with interview
Typical timeline
2y 6m
Avg Prosecution
42 currently pending
Career history
378
Total Applications
across all art units

Statute-Specific Performance

§101
0.7%
-39.3% vs TC avg
§103
89.4%
+49.4% vs TC avg
§102
1.6%
-38.4% vs TC avg
§112
6.7%
-33.3% vs TC avg
Black line = Tech Center average estimate • Based on career data from 339 resolved cases

Office Action

§102 §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 . Claim Status Claims 1-2, 4-11 and 13-17 are pending: Claims 1-2, 4-11 and 13-17 are rejected. Response to Amendments Amendments filed 03/31/2026 have been entered. Amendments to the claims overcome previous §102 and §103 rejections as previously set forth in non-final Office Action mailed 01/06/2026. Amendments have necessitated new grounds of rejection. Response to Arguments Arguments filed 03/31/2026 have been entered. Arguments were fully considered. On pgs. 8-14 of Applicant’s arguments, Applicant argues that: Claim Rejections - 35 USC § 102 Claims 1-9 stand rejected under 35 U.S.C. 102(a)(1) as being anticipated by Neef (WO 2019/207024). The applicant respectfully traverses the rejection of claims 1-9 under U.S.C. 102(a)(1) as being anticipated by Neef (WO 2019/207024), for the following reasons. Regarding claims 1-5 Independent claim 1 is amended. The an amended portion of the claim language of amended claim 1 requires, inter-alia: ... wherein an outer end face (162) of first end plate (160) includes, at least one engagement means (110) embodied as at least one recess formed in the outer end face (162) of the first end plate (160), spaced radially inwardly away from a rim (164) of the first end plate (160) and extending in the axial direction parallel to the longitudinal axis (50), wherein the at least one engagement means (110) is configured to contact a further filter element (200) to be arranged adjacent to the first end plate (160) in the axial direction. See, paragraphs [0056] and [0066]; Figs. 2-5. Additional support is found directly in the originally filed application at paragraphs [0020] and [0021] teaching: "[0020] According to a beneficial embodiment, the engagement means can be formed as a recess. In particular, the engagement means can be embodied as a recess in a rim region of the end plate. This region is particularly stable." "[0021] A recess can be designed as an opening or depression surrounded by a material or as a type of groove, for example, in U-shape or V-shape, in a material with an open side facing outwardly in radial direction." Additional support can be found in other places in the originally filed specification, claims and drawings. Respectfully, in our reading, Neef (WO 2019/207024) fails to teach, disclose or fairly suggest: at least one engagement means (110) embodied as at least one recess formed in the outer end face (162) of the first end plate (160), spaced radially inwardly away from a rim (164) of the first end plate (160) and extending in an axial direction parallel to the longitudinal axis (50), wherein the at least one engagement means (110) is configured to contact a further filter element (200) to be arranged adjacent to the first end plate (160) in the axial direction as required by the claim language of amended claim 1. Regardinq claims 4 and 5: The claim language of claims 4 and 5 require, in summary: The filter element according to claim 1, wherein the recess is arranged in a rim region (164) of the first end plate (160). The filter medium body (102) is embedded in the rim region (164) of the first end plate (160). The at least one engagement means (110) is arranged in the rim region (164) of the first end plate (160). Respectfully, in our reading, Neef (WO 2019/207024) fails to teach, disclose or fairly suggest the above additional limitations required by the language of claims 4 and 5. Regardinq claims 6-9 Independent claim 6 is amended to require, inter-alia: a filter medium body (200); a seal device (218) connected to the filter medium body and configured to radially seal the filter element in relation to a filter housing; wherein the seal device comprises at least one pin-shaped engagement means (210) having an endarranged on the seal device and proiectinq outwardly in an axial direction perpendicularly to the plane spanned by the seal device;_and wherein the at least one pin-shaped engagement means (210) is configured to engage an adiacent filter element (100), positioning the adiacent filter element (100) spaced away from the filter medium body (202) in the axial direction at a clearance (paragraph (00631, 302, Fig 5). Support for the amendment is found directly in paragraphs [0063], [0066] and Fig. 5 as well as in other places in the originally filed specification, claims and drawings. Respectfully, in our reading, Neef (WO 2019/207024) fails to teach, disclose or fairly suggest a filter element having at least one pin-shaped engagement means configured to engage an adjacent filter element, positioning the adjacent filter element spaced away from the filter medium body in the axial direction at a (free space) clearance. Claims 7 and 8 depend from amended and discussed claim 6. Regarding claim 9 The claim language of amended claim 9 requires, inter-alia: (with drawing reference labels for easy cross-reference to support) wherein the at least one pin-shaped engagement means (210) is a pin (210) having a first end arranged on the plate of the seal device and projecting perpendicularly to the plane spanned by the seal device, wherein the pin projects in the axial direction away from the plate beyond the filter medium body by at least the clearance (302), and wherein the at least one pin-shaped second engagement means (210) is configured to contact and engage the adjacent filter element (100) to position the adjacent filter element at the clearance (302 Fig. 5) away from the filter medium body (202). Support is found directly in paragraph [0005], in Figs, 3 and 5, as well as in other places in the of the originally filed specification, claims and drawings. Respectfully, in our reading, Neef (WO 2019/207024) fails to teach, disclose or fairly suggest a filter element having at least the above limitations of amended claim 9. In view of the above discussion and in view of the claim dependencies, the applicant respectfully believes and kindly asserts that claims 1-9 are novel over Neef (WO 2019/207024). Thus, applicant respectfully requests the reconsideration and the withdrawal of the rejection of claims 1-9 under U.S.C. 102(a)(1) as being anticipated by Neef (WO 2019/207024). Claim Rejections - 35 USC § 103 Claim 10 stands rejected under 35 U.S.C. 103 as being unpatentable over Neef (WO 2019/207024) in view of Scott (USPN 8,216,335). The applicant respectfully traverses the rejection of claim 10 as being unpatentable over Neef (WO 2019/207024) in view of Scott (USPN 8,216,335), for the following reasons. The Office Action asserts that Scott teaches an air cleaner (see ABS) comprising a demounting aid of "wire latches" (Scott: 506), the Office equating this with the applicant's demounting aid. First, we note that claim 10 is amended herein to require, inter-alia: (with drawing reference labels added for easy cross reference to support); ... wherein the at least one engagement means comprises a demounting aid (220, Fig 3) embodied as a cutout (220) formed into the pin-shaped engagement means (210), the demounting aid configured to receive a demounting force for demounting the filter element from the filter housing. Respectfully, Neef (WO 2019/207024) in view of Scott (USPN 8,216,335) teaches a "demounting aid" (Scott 506), as wire latches 506 of an air cleaner housing. Scott's wire latches 506 (Scott's Fig 19) removably mounting Scott's housing cover 503 onto the sidewall 506 of Scott's air cleaner housing. Neef (WO 2019/207024) in view of Scott (USPN 8,216,335) fails to teach, disclose or fairly suggest the applicant's demounting aid "embodied as a cutout (220) formed into the pin-shaped engagement means (210), the demounting aid configured to receive a demounting force for demounting the filter element from the filter housing". Respectfully, and very different from Scott, the applicant's demounting aid is taught and disclosed as a cutout 220 formed in the sidewall of the pin-shaped engagement means 210 (Fig 3). A cutout, not Scott's air cleaner housing wire latches. To more distinctly claim the originally disclosed invention, the claim language of amended claim 10 is amended to recite, among other things: ... wherein the at least one engagement means comprises a demounting aid (220, Fig 3) embodied as a cutout (220) formed into the pin-shaped engagement means (210), the demounting aid configured to receive a demounting force for demounting the filter element from the filter housing. Support for the amendment is found directly in paragraph [0030] and Fig. 3, as well as at other places in the originally filed specification, claims and drawings. In view of the above, the applicant respectfully requests the reconsideration and the withdrawal of the 35 U.S.C. 103 rejection of claim 10 as being unpatentable over Neef (WO 2019/207024) in view of Scott (USPN 8,216,335). Claims 11-17 stand rejected under 35 U.S.C. 103 as being unpatentable over Neef (WO 2019/207024) in view of Gillenberg (US 2010/0096315). The applicant respectfully traverses the rejection of claims 11-17 under 35 U.S.C. 103 as being unpatentable over Neef (WO 2019/207024) in view of Gillenberg (US 2010/0096315), for the following reasons. Regardinq claim 11: Respectfully, in our reading, the combined teaching of Neef (WO 2019/207024) in view of Gillenberg (US 2010/0096315) fail to teach, disclose or fairly suggest: A first filter element and a second filter element. The second filter element having a seal device comprising at least one pin- shaped second engagement means projecting outwardly in the axial direction towards the first filter element at a radial outer side of the second filter medium body and beyond the second filter medium body by at least a clearance to engage with the at least one first engagement means of the first filter element, such that, when the at least one first engagement means and the at least one second engagement means engage each other, the first filter element is held spaced apart from the second filter medium body at the clearance. (emphasis added). as required by the claim language of amended claim 11. Claim 12 is canceled without prejudice. Regardinq claims 13-17 Claims 13-17 depend from and require all of the claim limitations of the filter element arrangement according to claim 11. Respectfully the patentability of amended claim 11 over Neef (WO 2019/207024) in view of Gillenberg (US 2010/0096315) was discussed and shown to be patentable above. In view of the above, the applicant respectfully requests the reconsideration and the withdrawal of the 35 U.S.C. 103 rejection of claims 11-17 under 35 U.S.C. 103 as being unpatentable over Neef (WO 2019/207024) in view of Gillenberg (US 2010/0096315). Accordingly, the applicant believes all claims are allowable and the application is now in condition for immediate allowance. The argument are considered moot because amendments have necessitated new grounds of rejection. 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. The factual inquiries for establishing a background for determining obviousness under 35 U.S.C. 103 are summarized as follows: 1. Determining the scope and contents of the prior art. 2. Ascertaining the differences between the prior art and the claims at issue. 3. Resolving the level of ordinary skill in the pertinent art. 4. Considering objective evidence present in the application indicating obviousness or nonobviousness. This application currently names joint inventors. In considering patentability of the claims the examiner presumes that the subject matter of the various claims was commonly owned as of the effective filing date of the claimed invention(s) absent any evidence to the contrary. Applicant is advised of the obligation under 37 CFR 1.56 to point out the inventor and effective filing dates of each claim that was not commonly owned as of the effective filing date of the later invention in order for the examiner to consider the applicability of 35 U.S.C. 102(b)(2)(C) for any potential 35 U.S.C. 102(a)(2) prior art against the later invention. Claims 1-2 and 4-5 are rejected under 35 U.S.C. 103 as being unpatentable over Neef (WO 2019/207024; US 2021/0039031, which is a national stage application of the PCT/EP2019/060565 (WO 2019/207024) has been used as an English equivalent document for Neef) in view of Scott (US 2004/0134171). Regarding claim 1, Neef teaches a filter element (see ABS) comprising: a filter medium body(filter medium body 6) comprising a wall configured to be flowed through by a fluid to be purified in a radial direction in relation to a longitudinal axis of the filter medium body (the fluid flows through the wall of the filter medium body 6 radially from the inside to the outside, see ¶38), wherein the filter medium body comprises oppositely positioned end faces (see Figs. 4-5) spaced apart in an axial direction along the longitudinal axis, wherein the axial direction is a direction of the longitudinal axis (see Fig. 6); a first end plate (end plate 10) and a second end plate (end plate 9) arranged at the oppositely positioned end faces of the filter medium body (see Figs. 4-5); wherein an outer end face of first end plate includes at least one engagement means (opening 28), wherein the at least one engagement means is configured to contact a further filter element to be arranged adjacent to the first end plate in the axial direction (the fluid after flowing through the round filter element 5 is forced to flow through the secondary filter element 31 in the axial direction from top to bottom, see ¶51). Neef does not teach that the at least one engagement means is embodied as at least one recess formed in the outer end face of the first end plate, spaced radially inwardly away from a rim of the first end plate and extending in the axial direction parallel to the longitudinal axis. In a related field of endeavor, Scott teaches an air cleaner (see ABS) comprising at least one engagement means is embodied as at least one recess (receiver 185) formed in the outer end face of the first end (see Fig. 3), spaced radially inwardly away from a rim of the first end (see Fig. 3) and extending in the axial direction parallel to the longitudinal axis (see Fig. 3). It would have been obvious to one of ordinary skill in the art before the effective filing date of invention to modify the engagement means of Neef by configuring said engagement means as at least one recess formed in the outer end face of the first end plate, spaced radially inwardly away from a rim of the first end plate and extending in the axial direction parallel to the longitudinal axis as disclosed by Scott because it facilitates alignment and support between components (Scott, see ¶165); thereby, improving positioning and assembly. Regarding claim 2, Neef and Scott teach the filter element according to claim 1, wherein the first end plate (Neef, i.e. end plate 10) is a closed end plate (Neef, see Figs. 6-7). Regarding claim 4, Neef and Scott teach the filter element according to claim 1, wherein the recess is arranged in a rim region of the first end plate (Neef, a further support element 29 a in the form of a blade is provided at the support body 33 in the rim region and projects into the rim-side recess 30 which is formed as one piece together with the shaped body 25, see ¶53; Neef shows in Fig. 7 that the recess 30 receives support element 29a of secondary filter element 31, thereby contacting and engaging a further filter element arranged axially adjacent to the first filter element). The recess of claim 4 is interpreted to be a recess of the at least one engagement means recited in claim 1. Regarding claim 5, Neef and Scott teach the filter element according to claim 1, wherein the filter medium body is embedded in a region of the first end plate (Neef, see Figs. 6-7). Claims 6-9 are rejected under 35 U.S.C. 103 as being unpatentable over Neef (WO 2019/207024; US 2021/0039031, which is a national stage application of the PCT/EP2019/060565 (WO 2019/207024) has been used as an English equivalent document for Neef) in view of Gillenberg (US 2010/0096315). Regarding claim 6, Neef teaches a filter element (see ABS) comprising: a filter medium body (filter medium body 6); a seal device (sealing disk 26) connected to the filter medium body (see Fig. 5) and configured to radially seal the filter element in relation to a filter housing (see Fig. 7); wherein a flow direction of a fluid to be filtered through the filter medium body is arranged perpendicularly to a plane spanned by the seal device (see Fig. 6); wherein the seal device comprises: at least one pin-shaped engagement means (support pin 29) having an end arranged on the seal device and projecting outwardly in an axial direction perpendicularly to the plane spanned by the seal device (see Fig. 7). Neef does not teach that the at least one pin-shaped engagement means is configured to engage an adjacent filter element, positioning the adjacent filter element spaced away from the filter medium body in the axial direction at a clearance. In a related field of endeavor, Gillenberg teaches fluid filter with a filter element (see ABS) teaches at least one engagement means (mounting aids 11, 12, see ¶28 and Fig. 5) is configured to engage an adjacent filter element (filter element 10), positioning the adjacent filter element spaced away from the filter medium body in the axial direction at a clearance (see Fig. 1 of mounting aid 11 positioning filter element 10 spaced away from filter element 6) (socket 11 is positioned at a minimal radial spacing relative to the radially father outwardly positioned inner wall of the filter housing 2, see ¶27). It would have been obvious to one of ordinary skill in the art before the effective filing date of invention to modify the pin-shaped engagement means of Neef by configuring to engage an adjacent filter element, positioning the adjacent filter element spaced away from the filter medium body in the axial direction at a clearance as disclosed by Gillenberg because it ensures that incorrect mounting of components in a filter is prevented (Gillenberg, see ¶4). Regarding claim 7, Neef and Gillenberg teach the filter element according to claim 6, wherein the seal device (Neef, sealing disk 26) comprises a region radially outside of the filter medium body (Neef, see Fig. 6),wherein the at least one pin-shaped engagement (Neef, support member 29) means is arranged in said region of the seal device radially outside of the filter medium body (Neef, see Fig. 6). Regarding claim 8, Neef and Gillenberg teach the filter element according to claim 6, wherein the seal device comprises a plate with a circumferentially extending seal (the outer circumference, a circumferentially extending sealing element 34, see ¶51) having a seal extending circumferentially about a rim of the plate and configured to radially seal the filter element with the filter housing (see Fig. 8). Regarding claim 9, Neef and Gillenberg teach the filter element according to claim [[6]] 8, wherein the at least one pin-shaped engagement means is a pin (Neef, i.e. support pin 29) having a first end arranged on the plate of the seal device (Neef, sealing disk 26) and projecting perpendicularly to the plane spanned by the seal device (Neef, see Fig. 7), wherein the pin projects in the axial direction away from the plate beyond the filter element body to project outwardly from the filter element body by at least the clearance (Gillenberg, mounting aids 11, 12 means projects radially and axially, see ¶28 for maintaining spacing/clearance), and wherein the at least one pin-shaped second engagement means is configured to contact and engage the adjacent filter element to position the adjacent filter element at the clearance away from the filter medium body (Gillenberg, see Fig. 1 of mounting aid 11 positioning filter element 10 spaced away from filter element 6) (the combination of Neef as modified by Gillenberg teaches the claimed configuration). Claim 10 is rejected under 35 U.S.C. 103 as being unpatentable over Neef (WO 2019/207024; US 2021/0039031, which is a national stage application of the PCT/EP2019/060565 (WO 2019/207024) has been used as an English equivalent document for Neef) in view of Gillenberg (US 2010/0096315) and further in view of Rundzaitis (USPN 4,504,389). Regarding claim 10, Neef and Gillenberg teach the filter element according to claim 6. The combination does not teach that the at least one engagement means comprises a demounting aid embodied as a cutout formed into the pin-shaped engagement means, the demounting aid configured to receive a demounting force for demounting the filter element from the filter housing. In a related field of endeavor, Rundzaitis teaches a water filter (see ABS) comprising at least one engagement means (plunger 118) comprises a demounting aid embodied as a cutout (pin slot 124) formed into the pin-shaped engagement means (see Fig. 5), the demounting aid configured to receive a demounting force for demounting an element from a housing (the connector pin 116 slidably penetrates the pin slot 124 to provide sliding interconnection between the lever 30 and the plunger 120, see C5/L5-12). It would have been obvious to one of ordinary skill in the art before the effective filing date of invention to modify the engagement means of Neef by incorporating a demounting aid as disclosed by Rundzaitis because it provides slidable interconnection and movement (Rundzaitis, see C5/L4-12) thereby providing easy and convenient removal of components from a filter assembly. Claims 11-17 are rejected under 35 U.S.C. 103 as being unpatentable over Neef (WO 2019/207024) in view of Scott (US 2004/0134171) and further in view of Gillenberg (US 2010/0096315). Regarding claim 11, Neef teaches a filter element arrangement (see ABS) comprising: a first filter element (see Fig. 7) comprising: a first filter medium body (filter medium body 6) comprising a wall configured to be flowed through by a fluid to be purified in a radial direction in relation to a longitudinal axis of the first filter medium body (the fluid flows through the wall of the filter medium body 6 radially from the inside to the outside, see ¶38); wherein the first filter medium body comprises oppositely positioned end faces (see Figs. 4-5) spaced apart in an axial direction along the longitudinal axis, wherein the axial direction is a direction of the longitudinal axis (see Fig. 6); a first end plate (end plate 10) and a second end plate (end plate 9) arranged at the oppositely positioned end faces of the filter medium body (see Figs. 4-5); wherein an outer end face of first end plate includes, at least one first engagement means (opening 28)… Neef further discloses a seal device comprises at least one pin-shaped engagement means (support pin 29) projecting outwardly in the axial direction towards the first filter element (see Fig. 7). Neef does not teach (1) that the at least one first engagement means (opening 28) embodied as at least one recess formed in the outer end face of the first end plate, spaced radially inwardly away from a rim of the first end plate and extending in the axial direction parallel to the longitudinal axis into the first end face of the first end plate; and (2) that the second filter element comprising: a second filter medium body; a seal device connected to the second filter medium body configured to radially seal the second filter element in relation to a filter housing; wherein a flow direction of a fluid to be filtered through the second filter medium body is arranged perpendicularly to a plane spanned by the seal device; wherein the seal device comprises at least one pin-shaped second engagement means projecting outwardly in the axial direction towards the first filter element at a radial outer side of the second filter medium body and beyond the second filter medium body by at least a clearance to engage with the at least one first engagement means of the first filter element, such that, when the at least one first engagement means and the at least one second engagement means engage each other, the first filter element is held spaced apart from the second filter medium body at the clearance. In a related field of endeavor, Scott teaches an air cleaner (see ABS) comprising at least one engagement means is embodied as at least one recess (receiver 185) formed in the outer end face of the first end (see Fig. 3), spaced radially inwardly away from a rim of the first end (see Fig. 3) and extending in the axial direction parallel to the longitudinal axis (see Fig. 3). It would have been obvious to one of ordinary skill in the art before the effective filing date of invention to modify the engagement means of Neef by configuring said engagement means as at least one recess formed in the outer end face of the first end plate, spaced radially inwardly away from a rim of the first end plate and extending in the axial direction parallel to the longitudinal axis as disclosed by Scott because it facilitates alignment and support between components (Scott, see ¶165); thereby, improving positioning and assembly. In a related field of endeavor, Gillenberg teaches fluid filter with a filter element (see ABS) teaches at least one second engagement means (mounting aid 12, see ¶28 and Fig. 5) projecting outwardly in the axial direction towards the first filter element at a radial outer side of the second filter medium body and beyond the second filter medium body by at least a clearance (see Fig. 1 of mounting aid 12 projecting outwards in an axial direction towards filter element 6 at a radial outer side of filter element 10 and the filter element 10 has a space/clearance from filter element 6) to engage with the at least one first engagement means (mounting aid 11) of the first filter element, such that, when the at least one first engagement means and the at least one second engagement means engage each other (see Fig. 1), the first filter element is held spaced apart from the second filter medium body at the clearance (see Fig. 1). It would have been obvious to one of ordinary skill in the art before the effective filing date of invention to modify the pin-shaped engagement means of Neef by configuring to engage an adjacent filter element, positioning the adjacent filter element spaced away from the filter medium body in the axial direction at a clearance as disclosed by Gillenberg because it ensures that incorrect mounting of components in a filter is prevented (Gillenberg, see ¶4). Regarding claim 13, Neef and Gillenberg teach the filter system comprising: a housing (filter base housing 3); a filter element arrangement according to claim 11 exchangeably arranged in the housing (Neef as modified by Gillenberg teaches the claimed filter element arrangement device). Regarding claim 14, Neef and Gillenberg teach the filter system according to claim 13, wherein the housing comprises a housing part (Gillenberg, filler housing 2) comprising at least one housing engagement means (Gillenberg, i.e. mounting elements 11, 12), wherein the second filter element is configured to be mounted on the at least one housing engagement means (Gillenberg, see Fig. 5). Regarding claim 15, Neef and Gillenberg teach the filter system according to claim 14, wherein the second filter element is configured to be pushed on the at least one housing engagement means or inserted into the at least one housing engagement means (Gillenberg, secondary filter element 10 inserted into the housing engagement means, see Figs. 5-6). Regarding claim 16, Neef and Gillenberg teach the filter system according to claim 14, wherein the at least one second engagement means of the seal device of the second filter element and the at least one housing engagement means engage each other (Gillenberg, see Fig. 6). Regarding claim 17, Neef and Gillenberg teach the filter system according to claim 16, wherein the at least one housing engagement means is a pin (Gillenberg, mounting aid element 11 is in the shape of a pin) extending in the axial direction (Gillenberg, see Fig. 6) and engaging an opening of the at least one second engagement means of the seal device of the second filter element (Gillenberg, see Fig. 6). 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 EKANDRA S. MILLER-CRUZ whose telephone number is (571)270-7849. The examiner can normally be reached M-Th 7 am - 6 pm EST. 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, Benjamin L. Lebron can be reached at (571) 272-0475. 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. /EKANDRA S. MILLER-CRUZ/Primary Examiner, Art Unit 1773
Read full office action

Prosecution Timeline

Sep 05, 2023
Application Filed
Nov 25, 2025
Non-Final Rejection (signed) — §102, §103
Jan 06, 2026
Non-Final Rejection mailed — §102, §103
Mar 31, 2026
Response Filed
Jun 16, 2026
Final Rejection mailed — §102, §103 (current)

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Prosecution Projections

3-4
Expected OA Rounds
66%
Grant Probability
99%
With Interview (+52.2%)
2y 6m (~0m remaining)
Median Time to Grant
Moderate
PTA Risk
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