Prosecution Insights
Last updated: April 19, 2026
Application No. 18/913,194

RELIABLE GEARBOX FOR GAS TURBINE ENGINE

Final Rejection §112§DP
Filed
Oct 11, 2024
Examiner
WONG, ELTON K
Art Unit
3745
Tech Center
3700 — Mechanical Engineering & Manufacturing
Assignee
Rolls-Royce
OA Round
2 (Final)
78%
Grant Probability
Favorable
3-4
OA Rounds
2y 5m
To Grant
97%
With Interview

Examiner Intelligence

Grants 78% — above average
78%
Career Allow Rate
356 granted / 458 resolved
+7.7% vs TC avg
Strong +19% interview lift
Without
With
+19.3%
Interview Lift
resolved cases with interview
Typical timeline
2y 5m
Avg Prosecution
32 currently pending
Career history
490
Total Applications
across all art units

Statute-Specific Performance

§101
0.4%
-39.6% vs TC avg
§103
42.7%
+2.7% vs TC avg
§102
16.9%
-23.1% vs TC avg
§112
36.1%
-3.9% vs TC avg
Black line = Tech Center average estimate • Based on career data from 458 resolved cases

Office Action

§112 §DP
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 . Claims 1-6, 9-18, and 20-23 are currently pending. Claims 1-6, 9-18, 20-21, and 23 are allowed. Claim 22 is rejected. It is noted the claims submitted on November 12, 2025 appear with abnormal formatting. For example, see the unnecessary breaks in the excerpt of Claim 1 provided below. Applicant is requested to review the formatting of the entire claim set so that the claims are easier to read. PNG media_image1.png 295 660 media_image1.png Greyscale Response to Arguments Applicant’s arguments, see Pg. 8 of the remarks, filed November 12, 2025, with respect to the objection of the Abstract, objections of Claims 17 and 20, rejections of Claims 1-20 under 35 U.S.C. 112 have been fully considered and are persuasive in light of amendments. The objection of the Abstract, objections of Claims 17 and 20, rejections of Claims 1-20 under 35 U.S.C. 112 have been withdrawn. Applicant’s arguments, see Pg. 9 of the remarks, filed with respect to the rejection of Claim 1 under 35 U.S.C. 103 have been fully considered and are persuasive. The rejection of Claim 1 has been withdrawn. Applicant’s arguments are found persuasive in light of amendments. See “Allowable Subject Matter” section below. Claim Rejections - 35 USC § 112(d) The following is a quotation of 35 U.S.C. 112(d): (d) REFERENCE IN DEPENDENT FORMS.—Subject to subsection (e), a claim in dependent form shall contain a reference to a claim previously set forth and then specify a further limitation of the subject matter claimed. A claim in dependent form shall be construed to incorporate by reference all the limitations of the claim to which it refers. Claim 22 is rejected under 35 U.S.C. 112(d) or pre-AIA 35 U.S.C. 112, 4th paragraph, as being of improper dependent form for failing to further limit the subject matter of the claim upon which it depends, or for failing to include all the limitations of the claim upon which it depends. Regarding Claim 22, Lines 1-2 recite “wherein the gear mesh stiffness between the planet gears and the ring gear is in the range from 1.40x109 N/m to 2.00x1010 N/m”. This is the exact same limitation as recited in Claim 18, which Claim 22 depends upon. The only difference is the additional zeroes. Thus, Claim 22 is rejected for failing to further limit the subject matter of the claim upon which it depends, since it merely recites the same limitations. Applicant may cancel the claim(s), amend the claim(s) to place the claim(s) in proper dependent form, rewrite the claim(s) in independent form, or present a sufficient showing that the dependent claim(s) complies with the statutory requirements. Allowable Subject Matter Claims 1-6, 9-18, 20-21, and 23 are allowed. Regarding Claim 1, the claim has been amended to include the limitation of “the gear mesh stiffness between the planet gears and the ring gear multiplied by the gear mesh stiffness between the planet gears and the sun gear is less than 1.5x1019 N2m-2”. On Pg. 9 of the remarks filed November 12, 2025, as best understood, Applicant alleges this is not contemplated by the art of record and would not have been an obvious result of routinely optimizing with the claimed gear mesh stiffness between the planet gears and the sun gear. This is found to be persuasive. Therefore the rejection of Claim 1 has been withdrawn. This amendment also obviates the double patenting rejection that was previously given through further narrowing of the claim. Regarding Claim 21, the claim is similar in scope to previously recited Claim 1. The difference is the claim recites a range of gear mesh stiffness between the planet gears and ring gear instead of the planet gears and sun gear. The claim is considered allowable for the same reasons set forth above. Claims 2-6, 9-18, 20-21, and 23 subsequently depend upon Claims 1 and 21, respectively. As noted above, Applicant is suggested to check the formatting the claims. Applicant is also suggested to check the amendment to Claim 16, as the spacing between “to” and the numerical value appears small. 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 ELTON K WONG whose telephone number is (408)918-7626. The examiner can normally be reached Mon-Fri 8:00AM - 5:00PM PST. 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, Court Heinle can be reached at (571)270-3508. 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. /ELTON K WONG/Primary Examiner, Art Unit 3745
Read full office action

Prosecution Timeline

Oct 11, 2024
Application Filed
Aug 07, 2025
Non-Final Rejection — §112, §DP
Nov 12, 2025
Response Filed
Feb 09, 2026
Final Rejection — §112, §DP (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12600461
COVERING SYSTEM AND METHOD FOR A PITCH LINK OF A HELICOPTER
2y 5m to grant Granted Apr 14, 2026
Patent 12601282
TURBOFAN GAS TURBINE ENGINE WITH INNER RING REINFORCING STRUCTURE AND METHODS OF PRODUCING THE SAME
2y 5m to grant Granted Apr 14, 2026
Patent 12595823
AIRCRAFT ENGINE WITH SQUEEZE FILM DAMPER
2y 5m to grant Granted Apr 07, 2026
Patent 12595743
BLADED TURBOMACHINE ASSEMBLY INCLUDING MEANS FOR LIMITING VIBRATIONS BETWEEN PLATFORMS
2y 5m to grant Granted Apr 07, 2026
Patent 12560096
STATOR PART HAVING A FIN, IN A TURBINE ENGINE
2y 5m to grant Granted Feb 24, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

AI Strategy Recommendation

Get an AI-powered prosecution strategy using examiner precedents, rejection analysis, and claim mapping.
Powered by AI — typically takes 5-10 seconds

Prosecution Projections

3-4
Expected OA Rounds
78%
Grant Probability
97%
With Interview (+19.3%)
2y 5m
Median Time to Grant
Moderate
PTA Risk
Based on 458 resolved cases by this examiner. Grant probability derived from career allow 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