Prosecution Insights
Last updated: May 04, 2026
Application No. 19/191,660

NOVEL CYTOKINE-BASED THERAPIES AND METHODS

Final Rejection §DP
Filed
Apr 28, 2025
Priority
Mar 02, 2023 — provisional 63/488,145 +2 more
Examiner
NATARAJAN, MEERA
Art Unit
1643
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
Reverb Therapeutics Inc.
OA Round
2 (Final)
62%
Grant Probability
Moderate
3-4
OA Rounds
2y 2m
Est. Remaining
79%
With Interview

Examiner Intelligence

Grants 62% of resolved cases
62%
Career Allowance Rate
465 granted / 748 resolved
+2.2% vs TC avg
Strong +17% interview lift
Without
With
+16.6%
Interview Lift
resolved cases with interview
Typical timeline
3y 2m
Avg Prosecution
24 currently pending
Career history
772
Total Applications
across all art units

Statute-Specific Performance

§101
2.9%
-37.1% vs TC avg
§103
26.7%
-13.3% vs TC avg
§102
16.5%
-23.5% vs TC avg
§112
27.5%
-12.5% vs TC avg
Black line = Tech Center average estimate • Based on career data from 748 resolved cases

Office Action

§DP
DETAILED ACTION Applicant’s claim amendments in the response filed 03/17/2026 are acknowledged. Claims 1, 4-12, 16-19 are pending and will be examined on the merits. The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA . Double Patenting Maintained 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, 4-12, 16-19 are provisionally rejected on the ground of nonstatutory double patenting as being unpatentable over the claims of copending application USSN 19/191635. Although the claims at issue are not identical, they are not patentably distinct from each other because the instant claims are anticipated by the claims of the copending application, which are directed to methods comprising administering to the subject a bispecific polypeptide comprising a first binding region that binds endogenous IL-2 or IL-15, and a second binding region that binds to a marker expressed by a target cell. The instant claims and those of the copending application are directed to the same method administering the same multi-targeted construct and therefore overlap in scope. This is a provisional nonstatutory double patenting rejection because the patentably indistinct claims have not in fact been patented. Claims 1, 4-12, 16-19 are provisionally rejected on the ground of nonstatutory double patenting as being unpatentable over the claims of copending application USSN 19/191622. Although the claims at issue are not identical, they are not patentably distinct from each other because the instant claims are anticipated by the claims of the copending application, which are directed to methods comprising administering to the subject a bispecific polypeptide comprising a first binding region that binds endogenous IL-2 or IL-15, and a second binding region that binds to a marker expressed by a target cell. The instant claims and those of the copending application are directed to the same method administering the same multi-targeted construct and therefore overlap in scope. This is a provisional nonstatutory double patenting rejection because the patentably indistinct claims have not in fact been patented. Claims 1, 4-12, 16-19 are provisionally rejected on the ground of nonstatutory double patenting as being unpatentable over the claims of copending applications USSN 19/205170. Although the claims at issue are not identical, they are not patentably distinct from each other because the instant claims are anticipated by the claims of the copending application, which recite a bispecific molecule which comprises a cytokine-binding domain and a target-binding domain, wherein the cytokine is IL-2 or IL-15, wherein the bispecific molecule is a bispecific antibody, wherein the bispecific molecule redirects a cytokine to a target cell, and wherein the bispecific molecule treats a disease when administered to a subject. The instant claims and those of the copending applications are directed to the same multi-targeted construct and therefore overlap in scope. This is a provisional nonstatutory double patenting rejection because the patentably indistinct claims have not in fact been patented Response to Arguments Applicant's state “should all claims be found to be otherwise allowable, Applicant is willing to discuss filing of a terminal disclaimer to obviate the rejections. Therefore the double patenting rejections of record are hereby maintained. All other previous rejections are hereby withdrawn in view of applicants claim amendments and arguments in the response filed 3/17/2026. Conclusion Claims 1, 4-12, 16-19 are rejected. No Claim is allowed. 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. Any inquiry concerning this communication or earlier communications from the examiner should be directed to MEERA NATARAJAN whose telephone number is (571)270-3058. The examiner can normally be reached M-F 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, JULIE WU can be reached at 571-272-5205. 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. /Meera Natarajan/Primary Examiner, Art Unit 1643
Read full office action

Prosecution Timeline

Apr 28, 2025
Application Filed
Jul 02, 2025
Response after Non-Final Action
Nov 18, 2025
Non-Final Rejection — §DP
Mar 17, 2026
Response Filed
Apr 09, 2026
Final Rejection — §DP (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

3-4
Expected OA Rounds
62%
Grant Probability
79%
With Interview (+16.6%)
3y 2m (~2y 2m remaining)
Median Time to Grant
Moderate
PTA Risk
Based on 748 resolved cases by this examiner. Grant probability derived from career allowance rate.

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