Prosecution Insights
Last updated: April 19, 2026
Application No. 18/419,288

LIQUID FLUSH TO REMOVE AND PREVENT SOLIDS ACCUMULATION IN A HEAT EXCHANGER FOR A LIQUID PHASE HYDROGENATION REACTOR

Final Rejection §Other
Filed
Jan 22, 2024
Examiner
MCKANE, ELIZABETH L
Art Unit
3991
Tech Center
3900
Assignee
Chevron Phillips Chemical Company LP
OA Round
2 (Final)
61%
Grant Probability
Moderate
3-4
OA Rounds
3y 5m
To Grant
87%
With Interview

Examiner Intelligence

Grants 61% of resolved cases
61%
Career Allow Rate
135 granted / 221 resolved
+1.1% vs TC avg
Strong +26% interview lift
Without
With
+25.6%
Interview Lift
resolved cases with interview
Typical timeline
3y 5m
Avg Prosecution
27 currently pending
Career history
248
Total Applications
across all art units

Statute-Specific Performance

§101
0.4%
-39.6% vs TC avg
§103
43.0%
+3.0% vs TC avg
§102
18.7%
-21.3% vs TC avg
§112
22.9%
-17.1% vs TC avg
Black line = Tech Center average estimate • Based on career data from 221 resolved cases

Office Action

§Other
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 . Reissue Applications For reissue applications filed on or after September 16, 2012, all references to 35 U.S.C. 251 and 37 CFR 1.172, 1.175, and 3.73 are to the current provisions. Claim Status Original patent claims 1-20 are pending. Reissue Declaration The reissue oath/declaration filed with this application is defective (see 37 CFR 1.175 and MPEP § 1414) because of the following: The error statement in the declaration filed 5 December 2025 states that “[i]t has come to our attention that one of the previously filed inventor declarations was improperly signed. It is believed the original patent is wholly or partly inoperative or invalid by reason of claiming more or less than the patentee had the right to claim in the patent, since one of the previously filed inventor declarations was improperly signed. In addition to filing new inventor declarations by way of this form, Applicant is also pursuing a broadening reissue to broaden claims including independent claims 1 and 18. In particular, the amendments to claims 1 and 18 seek to broaden scope of the catalyst and scope of the liquid cooling loop.” Regarding the issue with the previously filed inventor declarations1, this is not an error upon which reissue can be based. See MPEP 1402. As to the amendments to claims 1 and 18, seeking to broaden the claims, it is noted that all claims have been amended to revert back to the original claimed subject matter. Therefore, there is no broadening and no error. Claims 1-20 are rejected as being based upon a defective reissue declaration under 35 U.S.C. 251 as set forth above. See 37 CFR 1.175. The nature of the defect(s) in the declaration is set forth in the discussion above in this Office action. Amendments The amendment filed 5 December 2025 proposes amendments to the claims that do not comply with 37 CFR 1.173(b), which sets forth the manner of making amendments in reissue applications. All amendments in reissue are made vis-à-vis the patent to be reissued. Where the original claim language is being added back to a claim, it is not underlined because it is not new with respect to the patent to be reissued. Nor is it necessary to show previous bracketing of the same term. For claims that have been reverted back to the original form, it is proper to list them in their original, non-marked up form with the status identifier “Original.” See MPEP 1453 IV and V.E. Related Proceedings Applicant is reminded of the continuing obligation under 37 CFR 1.178(b), to timely apprise the Office of any prior or concurrent proceeding in which Patent No. 11,643,376 is or was involved. These proceedings would include any trial before the Patent Trial and Appeal Board, interferences, reissues, reexaminations, supplemental examinations, and litigation. Applicant is further reminded of the continuing obligation under 37 CFR 1.56, to timely apprise the Office of any information which is material to patentability of the claims under consideration in this reissue application. These obligations rest with each individual associated with the filing and prosecution of this application for reissue. See also MPEP §§ 1404, 1442.01 and 1442.04. Response to Arguments Applicant’s arguments, see pages 10-14, filed 5 December 2025, with respect to the rejection over Snell in view of Stephenson have been fully considered and are persuasive. The rejection of claims 1-9, 11-16, 18, and 19 has been withdrawn. Conclusion THIS ACTION IS MADE FINAL. 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. Communication Any inquiry concerning this communication or earlier communications from the examiner should be directed to ELIZABETH L MCKANE whose telephone number is 5. The examiner can normally be reached on 6:30am-4:30pm (ET) Mon-Thurs. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor Patricia Engle can be reached on 571-272-6660. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of an application may be obtained at https://patentcenter.uspto.gov/. Should you have questions on access to the Patent Center system, contact the Electronic Business Center (EBC) at 866-217-9197 (toll- free). If you would like assistance from a USPTO Customer Service Representative or access to the automated information system, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. /ELIZABETH L MCKANE/Specialist, Art Unit 3991 Conferees: /LEONARDO ANDUJAR/ Primary Examiner, Art Unit 3991 /Patricia L Engle/ SPRS, Art Unit 3991 1 This alleged error was also referenced in the Declaration filed 22 January 2024. Thus, it must be assumed that the “previously filed inventor declarations” are those filed in the original patent.
Read full office action

Prosecution Timeline

Jan 22, 2024
Application Filed
Sep 04, 2025
Non-Final Rejection — §Other
Dec 05, 2025
Response Filed
Dec 16, 2025
Final Rejection — §Other
Jan 29, 2026
Examiner Interview Summary

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Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

3-4
Expected OA Rounds
61%
Grant Probability
87%
With Interview (+25.6%)
3y 5m
Median Time to Grant
Moderate
PTA Risk
Based on 221 resolved cases by this examiner. Grant probability derived from career allow rate.

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