Prosecution Insights
Last updated: May 29, 2026
Application No. 18/423,848

HYBRID AIRCRAFT POWER PLANT AND GEARBOX THEREFOR

Final Rejection §112
Filed
Jan 26, 2024
Examiner
DANG, TINH
Art Unit
3655
Tech Center
3600 — Transportation & Electronic Commerce
Assignee
Pratt & Whitney Canada Corp.
OA Round
2 (Final)
85%
Grant Probability
Favorable
3-4
OA Rounds
0m
Est. Remaining
93%
With Interview

Examiner Intelligence

Grants 85% — above average
85%
Career Allowance Rate
456 granted / 537 resolved
+32.9% vs TC avg
Moderate +8% lift
Without
With
+7.9%
Interview Lift
resolved cases with interview
Fast prosecutor
1y 11m
Avg Prosecution
17 currently pending
Career history
555
Total Applications
across all art units

Statute-Specific Performance

§101
1.0%
-39.0% vs TC avg
§103
43.1%
+3.1% vs TC avg
§102
21.5%
-18.5% vs TC avg
§112
32.1%
-7.9% vs TC avg
Black line = Tech Center average estimate • Based on career data from 537 resolved cases

Office Action

§112
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 . DETAILED CORRESPONDENCE This is in response to the amendment file on 08/20/2025 for Application No. 18/423,848. By the amendment, claims 1-3, 5-14 and 16-22 are pending with claims 1 and 9 being amended, claims 4 and 15 being canceled and newly claims 21-22 being added. Information Disclosure Statement The information disclosure statement (IDS) received on 07/18/2025 has been considered by the examiner. Response to Amendment / Arguments The amendment filed on 08/20/2025 has been entered. Applicant’s amendments have overcome the rejections of claim 1 under 35 U.S.C §102(a)(1) by Zheng and claims 2-3, 9-11 and 13-14 under 35 U.S.C §103 over Zheng and Harvey, and claims 9, 10 and 16 over Botti in view of Harvey, set forth in the prior Office action. Further, applicant’s arguments, see the Remarks filed 08/20/2025, with respect to the claims mentioned above have been fully considered and are persuasive. The rejections of the claims have been withdrawn. However, the amendment has raised new issues indicated below. Drawings The drawings are objected to under 37 CFR 1.83(a). The drawings must show every feature of the invention specified in the claims. Therefore, the --sleeve-- in claims 1 and 20, and the --sun gear(s)--, --ring gear(s)--, --planet gears--, and –carrier(s)-- in claims 8, 9, 19 and 22 must be shown or the features canceled from the claims. No new matter should be entered. Further, the drawings are objected to under 37 CFR 1.83(a). The drawings must show every feature of the invention specified in the claims. Therefore, the limitation - -a second reduction gearing coupled between the thermal engine shaft and the second clutch- - in claims 6 and 18 must be shown or the features canceled from the claims. No new matter should be entered. Corrected drawing sheets in compliance with 37 CFR 1.121(d) are required in reply to the Office action to avoid abandonment of the application. Any amended replacement drawing sheet should include all of the figures appearing on the immediate prior version of the sheet, even if only one figure is being amended. The figure or figure number of an amended drawing should not be labeled as “amended.” If a drawing figure is to be canceled, the appropriate figure must be removed from the replacement sheet, and where necessary, the remaining figures must be renumbered and appropriate changes made to the brief description of the several views of the drawings for consistency. Additional replacement sheets may be necessary to show the renumbering of the remaining figures. Each drawing sheet submitted after the filing date of an application must be labeled in the top margin as either “Replacement Sheet” or “New Sheet” pursuant to 37 CFR 1.121(d). If the changes are not accepted by the examiner, the applicant will be notified and informed of any required corrective action in the next Office action. The objection to the drawings will not be held in abeyance. Furthermore, the drawings are objected to under 37 CFR 1.83(a) because they fail to show - -a sun gear coaxial to a ring gear, a plurality of planet gears meshed between the sun gear and the ring gear, and a carrier coaxial to the sun gear and the ring gear. The planet gears are rotatably mounted to the carrier, around individual rotation axes which are radially offset from the central axis. Two or three of the sun gear, ring gear, and carrier may rotate around the central axis. In the illustrated embodiment, the ring gears of both epicyclic gearing are fixed relative to a casing, cowling, housing or other non-rotary structure of the power plant, the sun gears are made integral to the thermal engine shaft 122 and to the rotor shaft 124, respectively, and the carriers are directly coupled to the first clutch 136 and second clutch 138, respectively. In alternate embodiments, the configuration of the epicyclic gearing may be different, such as the carrier or sun being fixed instead of the ring gear, the sun being coupled to a clutch rather than to a shaft- - as described in the specification, see paragraph [0029]. Any structural detail that is essential for a proper understanding of the disclosed invention should be shown in the drawing. MPEP § 608.02(d). Corrected drawing sheets in compliance with 37 CFR 1.121(d) are required in reply to the Office action to avoid abandonment of the application. Any amended replacement drawing sheet should include all of the figures appearing on the immediate prior version of the sheet, even if only one figure is being amended. The figure or figure number of an amended drawing should not be labeled as “amended.” If a drawing figure is to be canceled, the appropriate figure must be removed from the replacement sheet, and where necessary, the remaining figures must be renumbered and appropriate changes made to the brief description of the several views of the drawings for consistency. Additional replacement sheets may be necessary to show the renumbering of the remaining figures. Each drawing sheet submitted after the filing date of an application must be labeled in the top margin as either “Replacement Sheet” or “New Sheet” pursuant to 37 CFR 1.121(d). If the changes are not accepted by the examiner, the applicant will be notified and informed of any required corrective action in the next Office action. The objection to the drawings will not be held in abeyance. Specification The disclosure is objected to because of the following informalities: in paragraph [0029], - -a sun gear coaxial to a ring gear, a plurality of planet gears meshed between the sun gear and the ring gear, and a carrier coaxial to the sun gear and the ring gear. The planet gears are rotatably mounted to the carrier, around individual rotation axes which are radially offset from the central axis. Two or three of the sun gear, ring gear, and carrier may rotate around the central axis. In the illustrated embodiment, the ring gears of both epicyclic gearing are fixed relative to a casing, cowling, housing or other non-rotary structure of the power plant, the sun gears are made integral to the thermal engine shaft 122 and to the rotor shaft 124, respectively, and the carriers are directly coupled to the first clutch 136 and second clutch 138, respectively. In alternate embodiments, the configuration of the epicyclic gearing may be different, such as the carrier or sun being fixed instead of the ring gear, the sun being coupled to a clutch rather than to a shaft- - are not shown/found in the any of the Drawings. Appropriate correction is required. 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. Claims 21 and 22 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. Claim 21 recites the limitations "the first reduction gearing" and “the second reduction gearing” in line 10. There is insufficient antecedent basis for these limitations in the claim. Claim 22 is rejected upon dependent from a rejected base claim and it inherits its deficiencies. Allowable Subject Matter Claims 1-3, 5-14 and 16-20 are allowed. As allowable subject matter has been indicated, applicant's reply must either comply with all formal requirements or specifically traverse each requirement not complied with. See 37 CFR 1.111(b) and MPEP § 707.07(a). Claim 21 is rejected but would be allowable if rewritten or amended to overcome the rejection(s) under 35 U.S.C. 112(b) or 35 U.S.C. 112 (pre-AIA ), 2nd paragraph, set forth in this Office action. Claim 22 is rejected but would be allowable if rewritten to overcome the rejection(s) under 35 U.S.C. 112(b) or 35 U.S.C. 112 (pre-AIA ), 2nd paragraph, set forth in this Office action and to include all of the limitations of the base claim and any intervening claims. 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 Tinh T Dang whose telephone number is (571)270-1776. The examiner can normally be reached Monday - Friday, 9AM - 5PM. 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, Ernesto Suarez can be reached at Mon-Friday from 8AM-4:30PM at (571) 272-2097. 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. /TINH T DANG/Primary Examiner, Art Unit 3655
Read full office action

Prosecution Timeline

Jan 26, 2024
Application Filed
Jun 03, 2025
Non-Final Rejection mailed — §112
Aug 20, 2025
Response Filed
Dec 29, 2025
Final Rejection mailed — §112 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12630211
STEER-BY-WIRE STEERING SYSTEM HAVING AN OFF-AXIS STEERING SYSTEM SUPPORT COLUMN PROVIDED WITH A STEERING WHEEL ROTATION LIMITING DEVICE
3y 2m to grant Granted May 19, 2026
Patent 12631250
PLANETARY GEARBOX WITH A THRUST WASHER HAVING ANTI-ROTATION MEANS
2y 0m to grant Granted May 19, 2026
Patent 12623753
SYSTEM AND METHOD FOR CHANGING A BICYCLE TRANSMISSION RATIO OF A BICYCLE TRANSMISSION
2y 4m to grant Granted May 12, 2026
Patent 12617264
CAR PROVIDED WITH AN INTERNAL COMBUSTION ENGINE ARRANGED WITH THE DRIVE SHAFT UP
2y 8m to grant Granted May 05, 2026
Patent 12611926
ELECTRIC DRIVE AXLE IN A VEHICLE
1y 10m to grant Granted Apr 28, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

Strategy Recommendation AI-generated — please review before filing

Get a prosecution strategy drawn from examiner precedents, rejection analysis, and claim mapping.
Typically takes 5-10 seconds — AI-generated, attorney review required before filing

Prosecution Projections

3-4
Expected OA Rounds
85%
Grant Probability
93%
With Interview (+7.9%)
1y 11m (~0m remaining)
Median Time to Grant
Moderate
PTA Risk
Based on 537 resolved cases by this examiner. Grant probability derived from career allowance rate.

Sign in with your work email

Enter your email to receive a magic link. No password needed.

Personal email addresses (Gmail, Yahoo, etc.) are not accepted.

Free tier: 3 strategy analyses per month