Prosecution Insights
Last updated: July 17, 2026
Application No. 18/410,226

FUEL CELL STACK

Non-Final OA §102
Filed
Jan 11, 2024
Priority
Jan 20, 2023 — JP 2023-007224
Examiner
D'ANIELLO, NICHOLAS P
Art Unit
Tech Center
Assignee
Toyota Boshoku Corporation
OA Round
1 (Non-Final)
68%
Grant Probability
Favorable
1-2
OA Rounds
8m
Est. Remaining
99%
With Interview

Examiner Intelligence

Grants 68% — above average
68%
Career Allowance Rate
597 granted / 875 resolved
+8.2% vs TC avg
Strong +42% interview lift
Without
With
+41.6%
Interview Lift
resolved cases with interview
Typical timeline
3y 2m
Avg Prosecution
49 currently pending
Career history
917
Total Applications
across all art units

Statute-Specific Performance

§103
82.2%
+42.2% vs TC avg
§102
6.9%
-33.1% vs TC avg
§112
1.3%
-38.7% vs TC avg
Black line = Tech Center average estimate • Based on career data from 875 resolved cases

Office Action

§102
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 § 102 The following is a quotation of the appropriate paragraphs of 35 U.S.C. 102 that form the basis for the rejections under this section made in this Office action: A person shall be entitled to a patent unless – (a)(1) the claimed invention was patented, described in a printed publication, or in public use, on sale, or otherwise available to the public before the effective filing date of the claimed invention. (a)(2) the claimed invention was described in a patent issued under section 151, or in an application for patent published or deemed published under section 122(b), in which the patent or application, as the case may be, names another inventor and was effectively filed before the effective filing date of the claimed invention. Claims 1 and 2 are rejected under 35 U.S.C. 102(a)(1 or 2) as being anticipated by Kageyama (US Pub 2016/0072136 newly cited). In regard to claim 1, Kageyama teaches a fuel cell stack, comprising stacked cells (unit cell C), wherein each of the cells (figure 7) includes: a plastic support frame member (frame 3 made of resin film, polymers discussed in paragraph [0023]) that supports a membrane electrode (MEA) assembly at a central portion of the support frame member; and two separators (separators 2) that sandwich the support frame member, the support frame member and the two separators each have a through-hole (communication holes 21-23) that defines a passage through which fluid flows, the passage extending in a stacking direction of the cells, the support frame member includes a protrusion 31 that protrudes from each of the separators 2 in at least one of an outer edge of the support frame member and a peripheral edge of the through-hole of the support frame member, and the protrusion is sandwiched by plastic frames 3 in the stacking direction together with outer edges of the separators, peripheral edges of the through-holes of the separators, or both the outer edges and the peripheral edges (paragraphs [0034-0068], annotated figure 7 below). PNG media_image1.png 513 705 media_image1.png Greyscale In regard to claim 2, one of two outer surfaces of the plastic frames 3 sandwiching the protrusion in the stacking direction includes a projection (protrusion 30A), and the other one of the two outer surfaces includes a recess (in sealing part 11), and the projection 30A of the plastic frame included in one of two adjacent ones of the stacked cells is fitted to the recess 11 of the plastic frame included in the other one of the two adjacent stacked cells (annotated figure 9a below, paragraphs [0074-0084]). PNG media_image2.png 472 484 media_image2.png Greyscale Conclusion The prior art made of record and not relied upon is considered pertinent to applicant's disclosure. Sano et al. (US Pub 2009/0098434 newly cited) teaches a similar sealing structure for fuel cell frames. Any inquiry concerning this communication or earlier communications from the examiner should be directed to NICHOLAS P D'ANIELLO whose telephone number is (571)270-3635. The examiner can normally be reached Monday to Friday 9am to 5pm 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, 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. /NICHOLAS P D'ANIELLO/Primary Examiner, Art Unit 1723
Read full office action

Prosecution Timeline

Jan 11, 2024
Application Filed
Jun 04, 2026
Non-Final Rejection mailed — §102 (current)

Precedent Cases

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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
68%
Grant Probability
99%
With Interview (+41.6%)
3y 2m (~8m remaining)
Median Time to Grant
Low
PTA Risk
Based on 875 resolved cases by this examiner. Grant probability derived from career allowance rate.

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