Prosecution Insights
Last updated: October 04, 2026
Application No. 18/284,856

Heat Transfer System with Heat Transfer Fluid Including Liquid and Gas Components

Non-Final OA §112
Filed
Sep 28, 2023
Priority
Mar 29, 2021 — EU 21165705.1 +1 more
Examiner
SLIFKA, COLIN W
Art Unit
1732
Tech Center
1700 — Chemical & Materials Engineering
Assignee
Castrol Limited
OA Round
1 (Non-Final)
67%
Grant Probability
Favorable
1-2
OA Rounds
3m
Est. Remaining
83%
With Interview

Examiner Intelligence

Grants 67% — above average
67%
Career Allowance Rate
604 granted / 899 resolved
+2.2% vs TC avg
Strong +16% interview lift
Without
With
+16.2%
Interview Lift
resolved cases with interview
Typical timeline
3y 3m
Avg Prosecution
23 currently pending
Career history
912
Total Applications
across all art units

Statute-Specific Performance

§101
0.8%
-39.2% vs TC avg
§103
54.3%
+14.3% vs TC avg
§102
11.4%
-28.6% vs TC avg
§112
25.1%
-14.9% vs TC avg
Black line = Tech Center average estimate • Based on career data from 899 resolved cases

Office Action

§112
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 . Continued Examination Under 37 CFR 1.114 A request for continued examination under 37 CFR 1.114, including the fee set forth in 37 CFR 1.17(e), was filed in this application after allowance or after an Office action under Ex Parte Quayle, 25 USPQ 74, 453 O.G. 213 (Comm'r Pat. 1935). Since this application is eligible for continued examination under 37 CFR 1.114, and the fee set forth in 37 CFR 1.17(e) has been timely paid, prosecution in this application has been reopened pursuant to 37 CFR 1.114. Applicant's submission filed on August 31, 2026 has been entered. 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 16 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 16 recites the limitation "the liquid component and gas component" in lines 2-3. There is insufficient antecedent basis for this limitation in the claim. Claim 1, line 7, recites “a liquid component and a gas component,” thus providing antecedent basis for each of “the liquid component” and “the gas component.” Claim 16, lines 2-3, in part, should be amended as follows: —the liquid component and the gas component —. Allowable Subject Matter Claims 1-9, 17, and 18 are allowed. Claim 16 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 Any inquiry concerning this communication or earlier communications from the examiner should be directed to COLIN W SLIFKA whose telephone number is (571)270-5830. The examiner can normally be reached Monday-Friday, 9:00 AM-5:30 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, Ching-Yiu (Coris) Fung can be reached at 571-270-5713. 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. /Colin W. Slifka/ Primary Examiner, Art Unit 1732
Read full office action

Prosecution Timeline

Sep 28, 2023
Application Filed
Aug 31, 2026
Request for Continued Examination
Sep 01, 2026
Response after Non-Final Action
Sep 04, 2026
Non-Final Rejection mailed — §112 (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
67%
Grant Probability
83%
With Interview (+16.2%)
3y 3m (~3m remaining)
Median Time to Grant
Low
PTA Risk
Based on 899 resolved cases by this examiner. Grant probability derived from career allowance rate.

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