Prosecution Insights
Last updated: April 19, 2026
Application No. 18/674,209

POLY(AMINE-CO-ESTER) POLYMERS AND POLYPLEXES WITH MODIFIED END GROUPS AND METHODS OF USE THEREOF

Non-Final OA §102§DP
Filed
May 24, 2024
Examiner
COHEN, MICHAEL P
Art Unit
1612
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
Yale University
OA Round
1 (Non-Final)
58%
Grant Probability
Moderate
1-2
OA Rounds
2y 11m
To Grant
86%
With Interview

Examiner Intelligence

Grants 58% of resolved cases
58%
Career Allow Rate
484 granted / 829 resolved
-1.6% vs TC avg
Strong +28% interview lift
Without
With
+27.6%
Interview Lift
resolved cases with interview
Typical timeline
2y 11m
Avg Prosecution
48 currently pending
Career history
877
Total Applications
across all art units

Statute-Specific Performance

§101
0.6%
-39.4% vs TC avg
§103
55.3%
+15.3% vs TC avg
§102
7.3%
-32.7% vs TC avg
§112
7.7%
-32.3% vs TC avg
Black line = Tech Center average estimate • Based on career data from 829 resolved cases

Office Action

§102 §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 . In the event the determination of the status of the application as subject to AIA 35 U.S.C. 102 and 103 (or as subject to pre-AIA 35 U.S.C. 102 and 103) is incorrect, any correction of the statutory basis for the rejection will not be considered a new ground of rejection if the prior art relied upon, and the rationale supporting the rejection, would be the same under either status. Claim Status Claims 1-32 are cancelled. Claims 33-51 are newly added. Claims 33-51 are pending and are examined on the merits in this prosecution. CLAIM REJECTIONS Anticipation Rejection The following is a quotation of the appropriate paragraphs of 35 U.S.C. 102 that form the basis for the rejections under this section made in this Office action: A person shall be entitled to a patent unless – (a)(1) the claimed invention was patented, described in a printed publication, or in public use, on sale or otherwise available to the public before the effective filing date of the claimed invention. 1) Claim 51 is rejected under 35 U.S.C. 102(a)(1) as being anticipated by Saltzman (US 9,895,451). Claim 51 is drawn to a “method of administering one or more therapeutic, diagnostic, or prophylactic agents, the method comprising administering to a subject or a cell in need thereof.” It is initially noted that one or more limitations may be missing from the claim that would more closely relate claim 51 to the instantly claimed invention. Saltzman teaches polyamine-co-ester- co-ortho ester) polymers, methods of forming active agent loaded nanoparticles of these polymers, as well as methods of using the nanoparticles for drug delivery (Abstract). Nonstatutory Double Patenting Rejections 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. See 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); and 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) may be used to overcome an actual or provisional rejection based on a nonstatutory double patenting ground provided the conflicting application or patent is shown to be commonly owned with this application. See 37 CFR 1.130(b). Effective January 1, 1994, a registered attorney or agent of record may sign a terminal disclaimer. A terminal disclaimer signed by the assignee must fully comply with 37 CFR 3.73(b). The USPTO internet Web site contains terminal disclaimer forms which may be used. Please visit http://www.uspto.gov/forms/. The filing date of the application will determine what form should be used. A web-based Terminal Disclaimer may be filled out completely online using web-screens. An e-Terminal Disclaimer that meets all requirements is auto-processed and approved immediately upon submission. For more information about eTerminal Disclaimers, refer to http://www.uspto.gov/patents/process/file/efs/guidance/eTD-info-I.jsp. 1) Claims 33-49 are rejected under the judicially created doctrine of nonstatutory double patenting as being unpatentable over claims 1-27 of U.S. Patent No. 11,814,464. Although the conflicting claims are not identical, they are not patentably distinct from each other because of the following reasons: Instant claim 33 is drawn to a polymer comprising: i) a plurality of units of formula: PNG media_image1.png 131 542 media_image1.png Greyscale ; and ii) two end groups each independently comprising a hydroxyl group, a primary amine group, a secondary amine group, or a tertiary amine group; wherein: n is an integer from 1-30; m, o, and p are independently integers from 1-20; Rx is hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted aryl, or substituted or unsubstituted alkoxy, and Z and Z' are independently O or NR', wherein R' is hydrogen, substituted or unsubstituted alkyl, or substituted or unsubstituted aryl. Conflicting claim 1 is drawn to a formulation comprising a polymer of Formula I: PNG media_image2.png 228 856 media_image2.png Greyscale wherein n is an integer from 1-30, m, o, and p are independently integers from 1-20, x, y, and q are independently integers from 1-1000, Rx is hydrogen, substituted or unsubstituted alkyl, or substituted or unsubstituted aryl, or substituted or unsubstituted alkoxy, Z and Z′ are independently O or NR′, wherein R′ is hydrogen, substituted or unsubstituted alkyl, or substituted or unsubstituted aryl, wherein R1 and R2 are chemical entities containing a hydroxyl group, a primary amine group, a secondary amine group, a tertiary amine group, or combinations thereof. The instant and conflicting claims differ because conflicting claim 1 limits q, x, and y to 1-1000. This limitation is not recited by the instant claims, which limit q, x, and y to 1. Nevertheless, the subject matter of conflicting claim 1 appears to be within the scope of that of instant claim 33, resulting in non-statutory double patenting. 2) Claims 33-50 are rejected under the judicially created doctrine of nonstatutory double patenting as being unpatentable over claims 1-16 of U.S. Patent No. 12,030,985. Although the conflicting claims are not identical, they are not patentably distinct from each other because of the following reasons: Instant claim 33 is drawn to a polymer comprising: i) a plurality of units of formula: PNG media_image1.png 131 542 media_image1.png Greyscale ; and ii) two end groups each independently comprising a hydroxyl group, a primary amine group, a secondary amine group, or a tertiary amine group; wherein: n is an integer from 1-30; m, o, and p are independently integers from 1-20; Rx is hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted aryl, or substituted or unsubstituted alkoxy, and Z and Z' are independently O or NR', wherein R' is hydrogen, substituted or unsubstituted alkyl, or substituted or unsubstituted aryl. Conflicting claim 1 is drawn to method of administering one or more therapeutic, diagnostic, or prophylactic nucleic acid agents, or combinations thereof in vivo, comprising administering to a subject or a cell in need thereof a polyplex or solid-core particle comprising the one or more therapeutic, prophylactic, or diagnostic nucleic acid agents and a polymer of Formula I: PNG media_image3.png 228 856 media_image3.png Greyscale wherein n is an integer from 1-30, m, o, and p are independently integers from 1-20, x, y, and q are independently integers from 1-1000, Rx is hydrogen, substituted or unsubstituted alkyl, or substituted or unsubstituted aryl, or substituted or unsubstituted alkoxy, Z and Z′ are independently O or NR′, wherein R′ is hydrogen, substituted or unsubstituted alkyl, or substituted or unsubstituted aryl, wherein R1 and R2 are chemical entities containing a hydroxyl group, a primary amine group, a secondary amine group, a tertiary amine group, or combinations thereof. The instant and conflicting claims differ because conflicting claim 1 recites a method comprising the polymer recited in instant claim 33, as well as limits q, x, and y to 1-1000. This limitation is not recited by the instant claims, which limit q, x, and y to 1. Nevertheless, the subject matter of conflicting claim 1 appears to be within the scope of that of instant claim 33, resulting in non-statutory double patenting. CONCLUSION Any inquiry concerning this communication or earlier communications from the examiner should be directed to MICHAEL P COHEN whose telephone number is (571)270-7402. The examiner can normally be reached on M-Th 8:30-5:30; F 9-4. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, Sahana S. Kaup, can be reached on (571) 272-6897. 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. /MICHAEL P COHEN/Primary Examiner, Art Unit 1612
Read full office action

Prosecution Timeline

May 24, 2024
Application Filed
Mar 07, 2026
Non-Final Rejection — §102, §DP (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12600990
mRNA INDUCED EXPRESSION OF BONE MORPHOGENIC PROTEIN AND RECEPTOR AND METHODS RELATED THERETO
2y 5m to grant Granted Apr 14, 2026
Patent 12582608
COATINGS FOR GASTRIC RESIDENCE DOSAGE FORMS
2y 5m to grant Granted Mar 24, 2026
Patent 12582581
LAMINATE SHEET FOR COSMETIC, AND COSMETIC SET
2y 5m to grant Granted Mar 24, 2026
Patent 12582669
COMPOSITION CONTROLLING PHARMACOKINETICS IN THE BODY
2y 5m to grant Granted Mar 24, 2026
Patent 12576037
POLYMER-ENCAPSULATED DRUG PARTICLES
2y 5m to grant Granted Mar 17, 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

1-2
Expected OA Rounds
58%
Grant Probability
86%
With Interview (+27.6%)
2y 11m
Median Time to Grant
Low
PTA Risk
Based on 829 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