Prosecution Insights
Last updated: August 06, 2026
Application No. 18/478,363

ANTI-PD-L1 ANTIBODIES AND ANTI-PD-L1/IL10 FUSION PROTEINS

Non-Final OA §DP
Filed
Sep 29, 2023
Priority
May 14, 2020 — provisional 63/024,855 +3 more
Examiner
OUSPENSKI, ILIA I
Art Unit
Tech Center
Assignee
Elixiron Immunotherapeutics (Hong Kong) Limited
OA Round
1 (Non-Final)
78%
Grant Probability
Favorable
1-2
OA Rounds
0m
Est. Remaining
98%
With Interview

Examiner Intelligence

Grants 78% — above average
78%
Career Allowance Rate
866 granted / 1117 resolved
+17.5% vs TC avg
Strong +20% interview lift
Without
With
+20.4%
Interview Lift
resolved cases with interview
Typical timeline
2y 8m
Avg Prosecution
40 currently pending
Career history
1160
Total Applications
across all art units

Statute-Specific Performance

§101
3.8%
-36.2% vs TC avg
§103
9.5%
-30.5% vs TC avg
§102
20.4%
-19.6% vs TC avg
§112
38.2%
-1.8% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1117 resolved cases

Office Action

§DP
DETAILED ACTION 1. The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA . 2. Applicant's preliminary amendment filed on 02/20/2024 is acknowledged. Claims 19-32 are pending. 3. Claim 25 is objected to because the VH SEQ ID Number in subclause (i) is missing. Appropriate correction is required. 4. 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 §§ 706.02(l)(1) - 706.02(l)(3) 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 USPTO Internet website contains terminal disclaimer forms which may be used. Please visit www.uspto.gov/patent/patents-forms. The 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/process/file/efs/guidance/eTD-info-I.jsp. 5. Claims 19-32 are rejected on the ground of nonstatutory double patenting as being unpatentable over the claims of U.S. Patent No. 11773167. 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 US ‘167 patent. The present application was filed as a continuation of USSN 17/870479 issued as US ‘167 patent. US ‘167 recites anti-PD-L1 antibodies comprising the same CDRs (claim 1), the same variable regions (claim 2) and the same heavy and light chains (claim 3) as the anti-PD-L1 antibody recited in instant claims. US ‘167 further recites in claim 4 fusions of IL-10 with the heavy chain of the anti-PD-L1 antibodies, in particular via the same linkers as recited in instant claim 24. Accordingly, instant claims 19-29 are anticipated by claims 1-4 of US ‘167. Claims 30 and 31 are included in the rejection, because polynucleotides encoding a protein and cells comprising the polynucleotide are inherent in recombinantly produced proteins. Claim 32 is included, because at present cancer treatment is the only clinical application of anti-PD-L1 antibodies, and as such would be at once envisaged by those skilled in the art in view of US ‘167 claims. 6. Claims 19-32 are provisionally rejected on the ground of nonstatutory double patenting as being unpatentable over the claims of copending applications USSN 18/519188 (published as US 20240190934), USSN 18/698803 (US 20240408177), and USSN 18/700015 (US 20240336667). 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 each of the above reference applications, which recite anti-PD-L1- IL-10 fusions within the scope of instant claims. Specifically, USSN ‘188 recites anti-PD-L1- IL-10 fusions wherein IL-10 is 80% identical to SEQ ID NO: 2, heavy chain is 80% identical to SEQ ID NO: 26 and light chain is 80% identical to SEQ ID NO: 27 (claims 1, 2, 10, 16 and 17). USSN ‘188 SEQ ID NOS: 2, 26 and 27 are identical to instant SEQ ID NOS: 73, 126 and 142, respectively (see SCORE). USSN ‘803 recites an IL-10 fusion protein having comprising two chains at least 80% identical to SEQ ID NO: 25 and SEQ ID NO: 26 (claims 1, 8 and 13). USSN ‘803 SEQ ID NO: 25 is a fusion of IL-10 to anti-PD-L1 antibody heavy chain identical to instant SEQ ID NO: 161, and USSN ‘803 SEQ ID NO: 26 is identical to instant SEQ ID NO: 142 (see SCORE). USSN ‘015 recites anti-PD-L1-IL-10 fusions wherein IL-10 comprises SEQ ID NO: 73 (identical to instant SEQ ID NO: 73 – see SCORE) (claims 1 and 21), and anti-PD-L1 antibody comprises a heavy chain of SEQ ID NO: 157 or 158 (identical to instant SEQ ID NOS: 158 and 159, respectively) and light chains of SEQ ID NO: 135 or 137 (identical to instant SEQ ID NOS: 136 and 138, respectively) (claims 26, 29, 31 and 33). Claims 30-32 are included in the rejection for the same reasons as articulated in section 5 above. This is a provisional nonstatutory double patenting rejection because the patentably indistinct claims have not in fact been patented. 7. Conclusion: no claim is allowed. 8. Any inquiry concerning this communication or earlier communications from the examiner should be directed to ILIA I OUSPENSKI whose telephone number is (571)272-2920. The examiner can normally be reached 9 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, 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. /ILIA I OUSPENSKI/ Primary Examiner, Art Unit 1644
Read full office action

Prosecution Timeline

Sep 29, 2023
Application Filed
Jul 16, 2026
Non-Final Rejection mailed — §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

1-2
Expected OA Rounds
78%
Grant Probability
98%
With Interview (+20.4%)
2y 8m (~0m remaining)
Median Time to Grant
Low
PTA Risk
Based on 1117 resolved cases by this examiner. Grant probability derived from career allowance rate.

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