Prosecution Insights
Last updated: August 17, 2026
Application No. 19/243,886

GAS TURBINE ENGINE HAVING A HEAT EXCHANGER LOCATED IN AN ANNULAR DUCT

Non-Final OA §112§DP
Filed
Jun 20, 2025
Priority
Jan 27, 2023 — CIP of 11/927,134 +1 more
Examiner
KIM, CRAIG SANG
Art Unit
3741
Tech Center
3700 — Mechanical Engineering & Manufacturing
Assignee
General Electric Company
OA Round
1 (Non-Final)
86%
Grant Probability
Favorable
1-2
OA Rounds
1y 10m
Est. Remaining
96%
With Interview

Examiner Intelligence

Grants 86% — above average
86%
Career Allowance Rate
673 granted / 781 resolved
+16.2% vs TC avg
Moderate +10% lift
Without
With
+9.9%
Interview Lift
resolved cases with interview
Typical timeline
3y 0m
Avg Prosecution
27 currently pending
Career history
815
Total Applications
across all art units

Statute-Specific Performance

§101
0.8%
-39.2% vs TC avg
§103
44.4%
+4.4% vs TC avg
§102
29.8%
-10.2% vs TC avg
§112
20.2%
-19.8% vs TC avg
Black line = Tech Center average estimate • Based on career data from 781 resolved cases

Office Action

§112 §DP
DETAILED ACTION This is a non-final rejection in response to application filed 6/20/25. Claims 1-20 are currently pending. 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. Claim 4-5, 12, 16-17, and 19 is 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. Claim 4-5, 16-17, and 19 recites the limitation “f1” or “a1”. There is insufficient antecedent basis for this limitation in the claim. Claim 12 recites the limitation "…the substantially annular defines a duct flow area…". The limitation is indefinite as it is unclear what the “substantially annular” refers to. Double Patenting The nonstatutory double patenting rejection is based on a judicially created doctrine grounded in public policy (a policy reflected in the statute) so as to prevent the unjustified or improper timewise extension of the “right to exclude” granted by a patent and to prevent possible harassment by multiple assignees. A nonstatutory double patenting rejection is appropriate where the conflicting claims are not identical, but at least one examined application claim is not patentably distinct from the reference claim(s) because the examined application claim is either anticipated by, or would have been obvious over, the reference claim(s). See, e.g., In re Berg, 140 F.3d 1428, 46 USPQ2d 1226 (Fed. Cir. 1998); In re Goodman, 11 F.3d 1046, 29 USPQ2d 2010 (Fed. Cir. 1993); In re Longi, 759 F.2d 887, 225 USPQ 645 (Fed. Cir. 1985); In re Van Ornum, 686 F.2d 937, 214 USPQ 761 (CCPA 1982); In re Vogel, 422 F.2d 438, 164 USPQ 619 (CCPA 1970); In re Thorington, 418 F.2d 528, 163 USPQ 644 (CCPA 1969). A timely filed terminal disclaimer in compliance with 37 CFR 1.321(c) or 1.321(d) may be used to overcome an actual or provisional rejection based on nonstatutory double patenting provided the reference application or patent either is shown to be commonly owned with the examined application, or claims an invention made as a result of activities undertaken within the scope of a joint research agreement. See MPEP § 717.02 for applications subject to examination under the first inventor to file provisions of the AIA as explained in MPEP § 2159. See MPEP § 2146 et seq. for applications not subject to examination under the first inventor to file provisions of the AIA . A terminal disclaimer must be signed in compliance with 37 CFR 1.321(b). The filing of a terminal disclaimer by itself is not a complete reply to a nonstatutory double patenting (NSDP) rejection. A complete reply requires that the terminal disclaimer be accompanied by a reply requesting reconsideration of the prior Office action. Even where the NSDP rejection is provisional the reply must be complete. See MPEP § 804, subsection I.B.1. For a reply to a non-final Office action, see 37 CFR 1.111(a). For a reply to final Office action, see 37 CFR 1.113(c). A request for reconsideration while not provided for in 37 CFR 1.113(c) may be filed after final for consideration. See MPEP §§ 706.07(e) and 714.13. The USPTO Internet website contains terminal disclaimer forms which may be used. Please visit www.uspto.gov/patent/patents-forms. The actual filing date of the application in which the form is filed determines what form (e.g., PTO/SB/25, PTO/SB/26, PTO/AIA /25, or PTO/AIA /26) should be used. A web-based eTerminal Disclaimer may be filled out completely online using web-screens. An eTerminal Disclaimer that meets all requirements is auto-processed and approved immediately upon submission. For more information about eTerminal Disclaimers, refer to www.uspto.gov/patents/apply/applying-online/eterminal-disclaimer. Claims 1-20 are rejected on the ground of nonstatutory double patenting as being unpatentable over claims 1-3, 5-6, 8-9 of U.S. Patent No. 12378932. Although the claims at issue are not identical, they are not patentably distinct from each other because the claims correspond nearly verbatim with the claims as matched up in the table below. Furthermore, it should be noted although the claims are method claims and the patent is an apparatus, the claims are to a method of operating a machine that merely recites the machine performing according to limitations fully claimed in the issued apparatus patent, and thus is not patently distinct from the apparatus claims. Claim Present Application Claim US 12378932 Basis 1 1 Nearly verbatim, differences are only that it is for a method and the BPR. 2 1 Obvious Variant 3 2 f ≥ 600 Hz (High power) 4 2 Verbatim 5 3 Verbatim 6 6 f ≥ 500 Hz (Medium power) 7 5 f ≥ 6300 Hz (Low power) 8 1 Obvious Variant 9 1 Obvious Variant 10 1 Obvious Variant 11 8 Verbatim 12 9 Verbatim 13 1 Nearly verbatim, differences are only that it is for a method and the gear drive configuration (Obvious Variant) 14 1 Obvious Variant 15 2 f ≥ 600 Hz (High power) 16 2 Verbatim 17 3 Verbatim 18 1 Obvious Variant 19 3 Obvious Variant 20 1 Obvious Variant Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to CRAIG SANG KIM whose telephone number is (571)270-1418. The examiner can normally be reached 7:00 AM - 3:00 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, Devon Kramer can be reached at 571-272-7118. 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. /CRAIG KIM/ Primary Examiner Art Unit 3741
Read full office action

Prosecution Timeline

Jun 20, 2025
Application Filed
Jul 27, 2026
Non-Final Rejection mailed — §112, §DP (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12687129
Gas Turbine Operation
2y 6m to grant Granted Jul 21, 2026
Patent 12680503
FUEL CHARACTERISTIC
2y 0m to grant Granted Jul 14, 2026
Patent 12674416
GEARBOX ASSEMBLY WITH LUBRICANT EXTRACTION VOLUME RATIO
1y 1m to grant Granted Jul 07, 2026
Patent 12650079
TURBINE ENGINE AIRFOIL
1y 3m to grant Granted Jun 09, 2026
Patent 12650114
METHOD OF VECTORING ROCKET THRUST USING AN ELECTRIC FIELD
1y 1m to grant Granted Jun 09, 2026
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
86%
Grant Probability
96%
With Interview (+9.9%)
3y 0m (~1y 10m remaining)
Median Time to Grant
Low
PTA Risk
Based on 781 resolved cases by this examiner. Grant probability derived from career allowance rate.

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