Prosecution Insights
Last updated: July 17, 2026
Application No. 18/410,214

FUEL CELL STACK

Non-Final OA §103
Filed
Jan 11, 2024
Priority
Jan 20, 2023 — JP 2023-007225
Examiner
SIDDIQUEE, MUHAMMAD S
Art Unit
Tech Center
Assignee
Toyota Boshoku Corporation
OA Round
1 (Non-Final)
78%
Grant Probability
Favorable
1-2
OA Rounds
6m
Est. Remaining
98%
With Interview

Examiner Intelligence

Grants 78% — above average
78%
Career Allowance Rate
805 granted / 1036 resolved
+17.7% vs TC avg
Strong +20% interview lift
Without
With
+20.1%
Interview Lift
resolved cases with interview
Typical timeline
3y 0m
Avg Prosecution
24 currently pending
Career history
1053
Total Applications
across all art units

Statute-Specific Performance

§101
0.4%
-39.6% vs TC avg
§103
86.9%
+46.9% vs TC avg
§102
1.3%
-38.7% vs TC avg
§112
0.8%
-39.2% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1036 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 . Priority Receipt is acknowledged of papers submitted under 35 U.S.C. 119(a)-(d), which papers have been placed of record in the file. Information Disclosure Statement 3. The information disclosure statements (IDS) submitted on 3/14/2024 and 5/29/2026 has/have been received and complies with the provisions of 37 CFR 1.97, 1.98 and MPEP § 609. Accordingly, the information disclosure statement(s) is/are being considered by the examiner, and a copy with initials is attached herewith. Drawings 4. The drawings were received on 1/11/2024. These drawings are acceptable. Claim Rejections - 35 USC § 103 5. 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. 6. 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. 7. 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. 8. Claim(s) 1-3 is/are rejected under 35 U.S.C. 103 as being unpatentable over Ohmori et al (US 20210075029 A1). Regarding claims 1-3, Ohmori discloses a fuel cell stack comprising stacked cells, wherein each of the cells includes a plastic support frame (50) that supports a membrane electrode assembly (48) at a central portion of the support frame; and two separators (36, 38) that sandwich the support frame (50), the support frame (50) and the two separators (36, 38) each have a through-hole (42a, 42b, 44a, 44b, 46a, 46b) that defines a passage through which fluid flows, the passage extending in a stacking direction of the cells, an outer surface of each of the two separators in the stacking direction includes a rib (72, 90), the rib (72, 90) protruding from an outer edge of the separator and from a peripheral edge of the through-hole (42a, 42b, 44a, 44b, 46a, 46b) of the separators (36, 38). Ohmori also teaches that the ribs (72, 90) comprises corrugated portions and the corrugated portions have the same period and amplitude [Fig. 2-3; paragraph 0028-0054]. Although, Ohmori remains silent that a shape of the rib on one of the two separators is different from a shape of the rib on the other one of the two separators and phases of the corrugated portions being shifted from each other by a period shorter than one period. However, it is within the technical grasp of a skilled artisan to provide different shape of the rib on each separator and shifting the phase of corrugated portions and would have been obvious. Therefore, the claim would have been obvious because a particular known technique was recognized as part of the ordinary capabilities of one skilled in the art (KSR v. Teleflex, 82 USPQ2d 1385, 127 S. Ct. 1727 (2007)) and an ordinarily skilled artisan would have recognized such a substitution without undue experimentation and with a reasonable expectation of success. Any inquiry concerning this communication or earlier communications from the examiner should be directed to MUHAMMAD S SIDDIQUEE whose telephone number is (571)270-3719. The examiner can normally be reached Monday - Friday, 8:00 am - 5:00 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, Tong Guo can be reached at (571) 272-3066. 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. /MUHAMMAD S SIDDIQUEE/ Primary Examiner, Art Unit 1723
Read full office action

Prosecution Timeline

Jan 11, 2024
Application Filed
Jun 11, 2026
Non-Final Rejection mailed — §103 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

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

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Prosecution Projections

1-2
Expected OA Rounds
78%
Grant Probability
98%
With Interview (+20.1%)
3y 0m (~6m remaining)
Median Time to Grant
Low
PTA Risk
Based on 1036 resolved cases by this examiner. Grant probability derived from career allowance rate.

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