Prosecution Insights
Last updated: April 19, 2026
Application No. 17/922,633

CAS9-BASED DIAGNOSTIC ASSAY AND METHODS OF USING

Final Rejection §102§103
Filed
Nov 01, 2022
Examiner
BURKHART, MICHAEL D
Art Unit
1638
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
President and Fellows of Harvard College
OA Round
2 (Final)
62%
Grant Probability
Moderate
3-4
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 §103
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 . Receipt and entry of the response dated 1/2/2026 is acknowledged. Claim Rejections - 35 USC § 102 The text of those sections of Title 35, U.S. Code not included in this action can be found in a prior Office action. Claim(s) 1, 2, 4, 5, 7, 11-14, 17, 25, 26, 29, 35, 37 is/are rejected under 35 U.S.C. 102(a)(1) as being anticipated by Wang et al (ACS Nano, Feb. 11, 2020). This rejection is maintained for reasons made of record in the Office Action dated 10/2/2025 and for reasons set forth below. Response to Arguments Applicant's arguments filed 1/2/2026 have been fully considered but they are not persuasive. Applicants essentially assert that Wang et al teach a labeled sgRNA or an labeled sgRNA/Cas9 complex, not a labeled Cas9. Such is not convincing. The Cas9 of Wang et al is considered to comprise a label because the Cas9 protein, or Cas9/gRNA complex, was detectable by such labels. That is, the Cas9 binds the label in a non-covalent manner and thus “comprises” the label. The claims do not recite a specific label attachment to the Cas9 protein, e.g. “covalently labeled”, as applicants appear to argue. In response to applicant's argument that the references fail to show certain features of the invention, it is noted that the features upon which applicant relies (i.e., a label “directly conjugated” to the Cas9) are not recited in the rejected claim(s). Although the claims are interpreted in light of the specification, limitations from the specification are not read into the claims. See In re Van Geuns, 988 F.2d 1181, 26 USPQ2d 1057 (Fed. Cir. 1993). Claim Rejections - 35 USC § 103 The text of those sections of Title 35, U.S. Code not included in this action can be found in a prior Office action. Claim(s) 1, 2, 4, 5, 7, 11-14, 17, 20-22, 25, 26, 29, 35, 37, 42-44 is/are rejected under 35 U.S.C. 103 as being unpatentable over Wang et al (ACS Nano, Feb. 11, 2020) in view of Zhang et al (US 20210292824 A1, e.f.d. 3/23/2020). This rejection is maintained for reasons made of record in the Office Action dated 10/2/2025 and for reasons set forth below. Response to Arguments Applicant's arguments filed 1/2/2026 have been fully considered but they are not persuasive. Applicants essentially assert that neither Wang or Zhang et al teach a labeled sgRNA or an labeled sgRNA/Cas9 complex, not a labeled Cas9. Such is not convincing. The Cas9 of Wang et al is considered to comprise a label because the Cas9 protein, or Cas9/gRNA complex, was detectable by such labels. That is, the Cas9 binds the label in a non-covalent manner and thus “comprises” the label. The claims do not recite a specific label attachment, e.g. “covalently labeled”, as applicants appear to argue. In response to applicant's argument that the references fail to show certain features of the invention, it is noted that the features upon which applicant relies (i.e., a label “directly conjugated” to the Cas9) are not recited in the rejected claim(s). Although the claims are interpreted in light of the specification, limitations from the specification are not read into the claims. See In re Van Geuns, 988 F.2d 1181, 26 USPQ2d 1057 (Fed. Cir. 1993). 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. 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
Read full office action

Prosecution Timeline

Nov 01, 2022
Application Filed
Aug 17, 2023
Response after Non-Final Action
Sep 30, 2025
Non-Final Rejection — §102, §103
Jan 02, 2026
Response Filed
Feb 21, 2026
Final Rejection — §102, §103 (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

3-4
Expected OA Rounds
62%
Grant Probability
72%
With Interview (+9.9%)
3y 3m
Median Time to Grant
Moderate
PTA Risk
Based on 811 resolved cases by this examiner. Grant probability derived from career allow rate.

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