Prosecution Insights
Last updated: April 19, 2026
Application No. 18/288,817

Compositions Comprising Adeno-Associated Virus Chimera Capsid Proteins and Methods of Using the Same

Non-Final OA §102§112
Filed
Oct 29, 2023
Examiner
BURKHART, MICHAEL D
Art Unit
1638
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
Duke University
OA Round
1 (Non-Final)
62%
Grant Probability
Moderate
1-2
OA Rounds
3y 3m
To Grant
72%
With Interview

Examiner Intelligence

Grants 62% of resolved cases
62%
Career Allow Rate
507 granted / 811 resolved
+2.5% vs TC avg
Moderate +10% lift
Without
With
+9.9%
Interview Lift
resolved cases with interview
Typical timeline
3y 3m
Avg Prosecution
45 currently pending
Career history
856
Total Applications
across all art units

Statute-Specific Performance

§101
3.8%
-36.2% vs TC avg
§103
27.5%
-12.5% vs TC avg
§102
21.0%
-19.0% vs TC avg
§112
25.2%
-14.8% vs TC avg
Black line = Tech Center average estimate • Based on career data from 811 resolved cases

Office Action

§102 §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 . Election/Restrictions Applicant's election with traverse of Group I in the reply filed on 3/20/26 is acknowledged. The traversal is on the ground(s) that Applicant’s disagree and the claimed methods provide a special technical feature over Sabin and Fu et al. This is not found persuasive because unsupported assertions are not convincing when evidence and reasoning are required. The teachings of Sabin and Fu et al are of record and not specifically disputed. Further, Applicants election of SEQ ID NO: 7 in the response is noted, however, contrary to applicants assertion, this was not a species election. It was made clear in the Restriction Requirement (page 6) that the election of a chimeric capsid was not a species election. Thus, claims 7 and are withdrawn because they do not recite the elected SEQ ID NO: 7. The requirement is still deemed proper and is therefore made FINAL. Claims 7, 8, 11, 15, 20, 30, 34-42 are withdrawn from further consideration pursuant to 37 CFR 1.142(b), as being drawn to a nonelected inventions, there being no allowable generic or linking claim. Applicant timely traversed the restriction (election) requirement in the reply filed on3/20/2026. 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 Rejections - 35 USC § 102 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 (i.e., changing from AIA to pre-AIA ) 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. 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. Claim(s) 1, 25, 26, 28 is/are rejected under 35 U.S.C. 102(a)(1) as being anticipated by Sabin et al (WO 2020/242984, of record, reference to the corresponding US PGPub document, US 20220241430 A1). Sabin et al teach AAV capsid proteins and vectors comprising such having chimeric VP1 proteins wherein the chimeric VP1 proteins are non-mammalian (e.g. avian) except for the N-terminal portion (e.g. the PLA2 or VP1 unique region), which is mammalian (e.g. AAV2). See, e.g., the abstract, Fig 1., ¶’s [0143]-[0148]. The chimeric capsids are designed to evade neutralizing antibodies because of the lack of specific antibodies to the chimeras in patients exposed to non-chimeric AAV. This property also renders the chimeric capsid AAVs with a higher gene transfer efficiency than the non-chimeric vectors (abstract, ¶’s [0004], [0009]-[0010]). The AAV vectors carry transgenes that encode missing (e.g. a reporter gene), mutant or therapeutic proteins (¶’s [0184], [0188]). Allowable Subject Matter Claim 2 is objected to as being dependent upon a rejected base claim, but would be allowable if rewritten in independent form including all of the limitations of the base claim and any intervening claims. Conclusion No claim is allowed. Any inquiry concerning this communication or earlier communications from the examiner should be directed to Michael Burkhart whose telephone number is (571)272-2915. The examiner can normally be reached M-F 8-5. 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, Tracy Vivlemore can be reached at 571 272-2914. 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 D BURKHART/ Primary Examiner, Art Unit 1638
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Prosecution Timeline

Oct 29, 2023
Application Filed
Apr 04, 2026
Non-Final Rejection — §102, §112 (current)

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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
62%
Grant Probability
72%
With Interview (+9.9%)
3y 3m
Median Time to Grant
Low
PTA Risk
Based on 811 resolved cases by this examiner. Grant probability derived from career allow rate.

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