Prosecution Insights
Last updated: July 17, 2026
Application No. 18/767,150

FIN DEVICE FOR HEAT EXCHANGER

Final Rejection §103§112
Filed
Jul 09, 2024
Examiner
RUPPERT, ERIC S
Art Unit
3763
Tech Center
3700 — Mechanical Engineering & Manufacturing
Assignee
Mahle International GmbH
OA Round
2 (Final)
60%
Grant Probability
Moderate
3-4
OA Rounds
9m
Est. Remaining
84%
With Interview

Examiner Intelligence

Grants 60% of resolved cases
60%
Career Allowance Rate
456 granted / 765 resolved
-10.4% vs TC avg
Strong +24% interview lift
Without
With
+24.0%
Interview Lift
resolved cases with interview
Typical timeline
2y 9m
Avg Prosecution
46 currently pending
Career history
810
Total Applications
across all art units

Statute-Specific Performance

§101
0.1%
-39.9% vs TC avg
§103
84.9%
+44.9% vs TC avg
§102
5.9%
-34.1% vs TC avg
§112
7.9%
-32.1% vs TC avg
Black line = Tech Center average estimate • Based on career data from 765 resolved cases

Office Action

§103 §112
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 Rejections - 35 USC § 112 The following is a quotation of 35 U.S.C. 112(b): (b) CONCLUSION.—The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the inventor or a joint inventor regards as the invention. The following is a quotation of 35 U.S.C. 112 (pre-AIA ), second paragraph: The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the applicant regards as his invention. Claims 9-10 are rejected under 35 U.S.C. 112(b) or 35 U.S.C. 112 (pre-AIA ), second paragraph, as being indefinite for failing to particularly point out and distinctly claim the subject matter which the inventor or a joint inventor (or for applications subject to pre-AIA 35 U.S.C. 112, the applicant), regards as the invention. Regarding claims 9-10, the recitations of “one or more louvers” are unclear, as it is unclear if these are the same as, or different from the previously defined “louvers” of claim 1. Claim Rejections - 35 USC § 103 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. Claim(s) 1-10, 14-16, 19-22 is/are rejected under 35 U.S.C. 103 as being unpatentable over Sasaki (JP2003042677A) in view of Wölk (US7147047B2). Regarding claim 1, Sasaki discloses a fin device (see Fig. 4-5 or 6-8) configured to be used within a heat exchanger for transferring heat energy, comprising: a first elongated strip (corrugated part 11) of material, and a second elongated strip of material (corrugated part 13), the first and second elongated strips of material extend in parallel to each other, and are disposed adjacent to each other, wherein a longitudinal axis (see axis from left to right, corresponding to line with theta in Fig. 4) extends parallel to both the first elongated strip of material and the second elongated strip of material; the first elongated strip of material comprises a plurality of rise portions (see respective rise portions of wave shape) and a plurality of fall portions (see respective fall portions of wave shape), that are disposed in alternating fashion with a trailing portion of a respective rise portion extending to a leading portion of a first adjacent fall portion to establish a first transition (respective flat wave portion 15), and a trailing portion of the first adjacent fall portion extending to a leading portion of a second rise portion to establish a second transition (respective flat wave portion 15); the second elongated strip of material comprises a plurality of rise portions and a plurality of fall portions, that are disposed in alternating fashion with a trailing portion of a respective rise portion extending to a leading portion of a first adjacent fall portion to establish a third transition (respective flat wave portion 15), and a trailing portion of the first adjacent fall portion extending to a leading portion of a second rise portion to establish a fourth transition (respective flat wave portion 15), wherein the respective rise portions of the first and second elongated strips are aligned in a staggered fashion (see offset in Fig. 4-5/6-8); a first bridge portion (connecting portions 21a) that extends from the first transition of the first elongated strip to a neighboring third transition of the second elongated strip; and a space (see space therebetween) between the first and second elongated strips of metal that extends between adjacent inner edges of the first and second elongated strips at positions other than where the first bridge portion extends; and wherein the first bridge portion (connecting portions 21a) forms a continuous connection between the first elongated strip of material and the second elongated strip of material. Sasaki does not teach wherein the plurality of rise portions and the plurality of fall portions further comprise a plurality of longitudinal cuts configured to form louvers. Wölk teaches (see Fig. 3) the plurality of rise portions and the plurality of fall portions (fin portions 4b) further comprise a plurality of longitudinal cuts (see cuts forming gills 7) configured to form louvers (gills 7). Therefore, it would have been obvious to one having ordinary skill in the art before the effective filing date of the claimed invention to have modified Sasaki to include the gills of Wölk, in order to improve heat transfer (Col. 2, lines 10-20). Regarding claim 2, Sasaki discloses the limitations of claim 1, and Sasaki further discloses a second bridge portion (21b) that extends from the second transition of the first elongated strip to a neighboring fourth transition of the second elongated strip. Regarding claim 3, Sasaki discloses the limitations of claim 1, and Sasaki further discloses the bridge portion (21a) extends from the first transition of the first elongated strip to a closest neighboring third transition of the second elongated strip. Regarding claim 4, Sasaki discloses the limitations of claim 1, and Sasaki further discloses the second bridge portion (21b) extends from the second transition of the first elongated strip to a closest neighboring fourth transition of the second elongated strip. Regarding claim 5, Sasaki discloses the limitations of claim 1, and Sasaki further discloses a bridge portion (21a) extends between adjacent first and third transitions, and a second bridge portion (21b) extends between adjacent second and fourth transitions along the first and second elongated strips. Regarding claim 6, Sasaki discloses the limitations of claim 1, and Sasaki further discloses the bridge portion and the second bridge portion each extend at an acute angle with respect to the longitudinal axis (theta, 30 degrees, Page 4). Regarding claim 7, Sasaki discloses the limitations of claim 1, and Sasaki further discloses the acute angle is between about 20 and 50 degrees with respect to the longitudinal axis (theta, 30 degrees, Page 4). Regarding claim 8, Sasaki teaches the limitations of claim 7, and Sasaki further discloses the acute angle is between about 22.5 to about 30 degrees with respect to the longitudinal axis (theta, 30 degrees, Page 4). Regarding claims 9-10, Sasaki teaches the limitations of claim 1, and Sasaki does not teach wherein each of the plurality of rise portions and the plurality of fall portions of the first elongated strip comprise one or more louvers formed therein, wherein each of the one or more louvers extend perpendicular to the longitudinal axis, wherein each of the plurality of rise portions and the plurality of fall portions of the second elongated strip comprise one or more louvers formed therein, wherein each of the one or more louvers extend perpendicular to the longitudinal axis. Wölk teaches (see Fig. 3) wherein each of the plurality of rise portions and the plurality of fall portions (fin portions 4b) of the first elongated strip comprise one or more louvers (gills 7) formed therein, wherein each of the one or more louvers extend perpendicular to the longitudinal axis, wherein each of the plurality of rise portions and the plurality of fall portions (fin portions 4b) of the second elongated strip comprise one or more louvers (gills 7) formed therein, wherein each of the one or more louvers extend perpendicular to the longitudinal axis. Therefore, it would have been obvious to one having ordinary skill in the art before the effective filing date of the claimed invention to have modified Sasaki to include the gills of Wölk, in order to improve heat transfer (Col. 2, lines 10-20). Regarding claim 14, Sasaki discloses the limitations of claim 1, and Sasaki further discloses a portion of the plurality of rise portions and fall portions away from the first and second transitions are substantially planar, and a portion of the plurality of rise portions and fall portions of the second elongated strip of material away from the third and fourth transitions are substantially planar (see substantially planar rise and fall portions of 11/13). Regarding claim 15, Sasaki discloses the limitations of claim 1, and Sasaki further discloses the first bridge portion (21a) is formed with two parallel sides between the first and third transitions. Regarding claim 16, Sasaki discloses the limitations of claim 1, and Sasaki further discloses the second bridge portion (21b) is formed with two parallel sides between the second and fourth transitions. Regarding claim 19, Sasaki discloses the limitations of claim 1, and Sasaki further discloses wherein portions of the first and second elongate strips of material are separated by elongate cuts (cutting portions 23 forming each connecting portion 21), wherein each elongate cut includes a center portion that extends along the longitudinal axis, and each elongate cut includes a front portion that extends from a front end of the center portion at the acute angle toward the second elongate portion, and each elongate cut includes a rear portion that extends from a rear end of the center portion at the acute angle toward the first elongate portion. Regarding claim 20, Sasaki discloses the limitations of claim 19, and Sasaki further discloses at least a majority of the rear portion of a first elongate cut of the plurality of elongate cuts is horizontally aligned with at least a majority of the front portion of the adjacent second elongate cut that is rearward of the first elongate cut, wherein the horizontally aligned front portion of the second elongate cut and the rear portion of the first elongate cut establishes one of the plurality of bridges (21a/21b). Regarding claim 21, Sasaki discloses a fin device (see Fig. 4-5 or 6-8) configured to be used within a heat exchanger for transferring heat energy, comprising: a first elongated strip (corrugated part 11) of material, and a second elongated strip of material (corrugated part 13), the first and second elongated strips of material extend in parallel to each other, and are disposed adjacent to each other, wherein a longitudinal axis (see axis from left to right, corresponding to line with theta in Fig. 4) extends parallel to both the first elongated strip of material and the second elongated strip of material; the first elongated strip of material comprises a plurality of rise portions (see respective rise portions of wave shape) and a plurality of fall portions (see respective fall portions of wave shape), that are disposed in alternating fashion with a trailing portion of a respective rise portion extending to a leading portion of a first adjacent fall portion to establish a first transition (respective flat wave portion 15), and a trailing portion of the first adjacent fall portion extending to a leading portion of a second rise portion to establish a second transition (respective flat wave portion 15) wherein the first elongated strip comprises a plurality of spaced first transitions and a plurality of spaced second transitions; wherein the longitudinal axis is spaced evenly between an outer edge of the first elongate strip and an outer edge of the second elongate strip; the second elongated strip of material comprises a plurality of rise portions and a plurality of fall portions, that are disposed in alternating fashion with a trailing portion of a respective rise portion extending to a leading portion of a first adjacent fall portion to establish a third transition (respective flat wave portion 15), and a trailing portion of the first adjacent fall portion extending to a leading portion of a second rise portion to establish a fourth transition (respective flat wave portion 15), wherein the respective rise portions of the first and second elongated strips are aligned in a staggered fashion (see offset in Fig. 4-5/6-8); such that the second elongate strip comprises a plurality of spaced third transitions and plurality of spaced fourth transitions; a first bridge portion (21a) that extends from a first of the first plurality of first transitions of the first elongated strip to a neighboring first of the plurality of fourth transitions of the second elongated strip, and a second bridge portion (21b) that extends from the fourth transition of the second elongated strip to a neighboring second of the first plurality of transitions of the first elongated strip that is disposed adjacent to and rearwardly of the neighboring first of the first plurality of transitions, and a space (see space therebetween) between the first and second elongated strips of metal that extends between adjacent inner edges of the first and second elongated strips at positions other than where the bridge portion extends; and wherein the first bridge portion (connecting portions 21a) forms a continuous connection between the first elongated strip of material and the second elongated strip of material. Sasaki does not teach wherein the plurality of rise portions and the plurality of fall portions further comprise a plurality of longitudinal cuts configured to form louvers. Wölk teaches (see Fig. 3) the plurality of rise portions and the plurality of fall portions (fin portions 4b) further comprise a plurality of longitudinal cuts (see cuts forming gills 7) configured to form louvers (gills 7). Therefore, it would have been obvious to one having ordinary skill in the art before the effective filing date of the claimed invention to have modified Sasaki to include the gills of Wölk, in order to improve heat transfer (Col. 2, lines 10-20). Regarding claim 22, Sasaki discloses the limitations of claim 21, and Sasaki further discloses comprising a third bridge portion (21) that extends from the second of the first transitions of the first elongated strip and to a second of the plurality of fourth transitions within the second elongated strip, with the second of the fourth transitions disposed rearwardly of the first of the fourth transitions along the second elongate strip. Claim(s) 11-12 is/are rejected under 35 U.S.C. 103 as being unpatentable over Sasaki (JP2003042677A) in view of Wölk (US7147047B2) and Kawamura (WO2021002474A1). Regarding claims 11-12, Sasaki teaches the limitations of claim 1, and Sasaki does not teach the adjacent first transitions within the first elongated strip are disposed at a first distance apart from each other along the longitudinal axis, and wherein the adjacent second transitions are disposed at the first distance apart from each other, wherein a second distance measured in parallel to the longitudinal axis between a first transition and an adjacent third transition is between about 10% to 30% of the first distance, wherein a distance from the first transition to the second transition is about half of the first distance along the longitudinal axis. Kawamura teaches (see Fig. 1) the adjacent first transitions within the first elongated strip are disposed at a first distance apart from each other along the longitudinal axis, and wherein the adjacent second transitions are disposed at the first distance apart from each other, wherein a second distance measured in parallel to the longitudinal axis between a first transition and an adjacent third transition is between about 10% to 30% of the first distance (see Pf and offset, defined by Pf/4, or 25%), wherein a distance from the first transition to the second transition is about half of the first distance along the longitudinal axis. Therefore, it would have been obvious to one having ordinary skill in the art before the effective filing date of the claimed invention to have modified to include the distances of Kawamura, as it has been held obvious to try when choosing from a finite number of identified, predictable solutions, with a reasonable expectation of success (see MPEP 2143). Claim(s) 17-18 and 23 is/are rejected under 35 U.S.C. 103 as being unpatentable over Sasaki (JP2003042677A) in view of Wölk (US7147047B2) and Fukuda (WO9930098A1). Regarding claim 17, Sasaki teaches the limitations of claim 1, and Sasaki does not teach wherein a bridge extends from the first transition of the first elongated strip to the closest neighboring third transition of the second elongated strip, wherein the first and the second elongated strips are arranged such that a bridge extends from every other first transition to a neighboring every other third transition. Fukuda teaches wherein a bridge extends from the first transition of the first elongated strip to the closest neighboring third transition of the second elongated strip, wherein the first and the second elongated strips are arranged such that a bridge extends from every other first transition to a neighboring every other third transition, and the adjacent first and third transitions to the every other first and third transitions do not have a bridge that connects them (see alternating connecting portions 63, Fig. 7b). Therefore, it would have been obvious to one having ordinary skill in the art before the effective filing date of the claimed invention to have modified Sasaki to include every other transitions do not have bridges as taught by Fukuda, in order to reduce weight while maintaining strength (Page 5). Regarding claim 18, Sasaki teaches the limitations of claim 17, and Fukuda further teaches a second bridge portion that extends from the second transition of the first elongated strip to a closest neighboring fourth transition of the second elongated strip, wherein the first and second elongated strips are arranged such that a second bridge extends from every other second transition to a neighboring fourth transitions (see alternating connecting portions 63, Fig. 7b). Regarding claim 23, Sasaki teaches the limitations of claim 21, and Sasaki does not teach the plurality of second transitions within the first elongate strip and the plurality of third transitions within the second elongate strip do not connect with any of the first, second, or third bridge portions. Fukuda teaches the plurality of second transitions within the first elongate strip and the plurality of third transitions within the second elongate strip do not connect with any bridge portions (see Fig. 7a/7c). Therefore, it would have been obvious to one having ordinary skill in the art before the effective filing date of the claimed invention to have modified Sasaki to include the bridge configuration as taught by Fukuda, in order to reduce weight while maintaining strength (Page 5). Response to Arguments Applicant's arguments filed 3/30/2026 have been fully considered but they are not persuasive. Regarding the newly added limitations, Examiner contends, as detailed above, the limitations are taught by Sasaki in view of Wölk. Regarding Kawamura, Applicant argues the reference is non-analogous. In response to applicant's argument that Kawamura is nonanalogous art, it has been held that a prior art reference must either be in the field of applicant’s endeavor or, if not, then be reasonably pertinent to the particular problem with which the applicant was concerned, in order to be relied upon as a basis for rejection of the claimed invention. As Kawamura is directed to a fin device configured to be used within a heat exchanger for transferring thermal energy, it meets both prongs. It is noted Applicant has provided no reasoning or analysis to support this position. 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 ERIC S RUPPERT whose telephone number is (571)272-9911. The examiner can normally be reached Monday - Friday 8 am - 4 pm. 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, Len Tran can be reached at 571-272-1184. 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. /ERIC S RUPPERT/Primary Examiner, Art Unit 3763
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Prosecution Timeline

Jul 09, 2024
Application Filed
Feb 19, 2026
Non-Final Rejection mailed — §103, §112
Mar 30, 2026
Response Filed
Apr 14, 2026
Final Rejection mailed — §103, §112 (current)

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Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

3-4
Expected OA Rounds
60%
Grant Probability
84%
With Interview (+24.0%)
2y 9m (~9m remaining)
Median Time to Grant
Moderate
PTA Risk
Based on 765 resolved cases by this examiner. Grant probability derived from career allowance rate.

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