Prosecution Insights
Last updated: July 17, 2026
Application No. 17/781,686

ENGINEERING CIRCULAR GUIDE RNAS

Non-Final OA §102§112
Filed
Jun 01, 2022
Priority
Dec 02, 2019 — provisional 62/942,725 +2 more
Examiner
BUI, PHUONG T
Art Unit
1663
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
The Regents of the University of California
OA Round
3 (Non-Final)
81%
Grant Probability
Favorable
3-4
OA Rounds
0m
Est. Remaining
99%
With Interview

Examiner Intelligence

Grants 81% — above average
81%
Career Allowance Rate
965 granted / 1188 resolved
+21.2% vs TC avg
Strong +23% interview lift
Without
With
+23.2%
Interview Lift
resolved cases with interview
Typical timeline
2y 4m
Avg Prosecution
53 currently pending
Career history
1228
Total Applications
across all art units

Statute-Specific Performance

§101
4.5%
-35.5% vs TC avg
§103
33.0%
-7.0% vs TC avg
§102
25.0%
-15.0% vs TC avg
§112
35.3%
-4.7% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1188 resolved cases

Office Action

§102 §112
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 . DETAILED ACTION 1. The Office acknowledges the receipt of Applicant’s Request for Continued Examination filed March 19, 2025. Claims 159, 162, 163, 165-167 and 169-178 are pending. Claims 172-178 are withdrawn. Claims 159, 162, 163, 165-167 and 169-171 are examined. All previous rejections not set forth below have been withdrawn. The text of those sections of Title 35, U.S. Code not included in this action can be found in a prior Office action. Applicant’s has priority benefit of Provisional Application No. 62/942715, filed December 2, 2019. Claim Objections 2. Claim 159 is objected to because of the following: in line 4, a comma should be inserted before the term “wherein”. Appropriate correction is required. Claim Rejections - 35 USC § 112(b) 3. Claims 165-167 are rejected under 35 U.S.C. 112(b) or 35 U.S.C. 112 (pre-AIA ), second paragraph, as being indefinite for failing to particularly point out and distinctly claim the subject matter which the inventor or a joint inventor (or for applications subject to pre-AIA 35 U.S.C. 112, the applicant), regards as the invention. In claim 165, the recitation of “the engineered circular guide RNA hybridized to the target RNA sequence” lacks antecedence. Claim 159 is directed to a circular guidance RNA comprising two components: (i) a targeting domain and ii) an additional secondary structure. The “hybridization” language in claim 159 describes the function of the targeting domain. Claim 165 implies that the circular guide RNA of claim 159 also comprises the target RNA sequence. Does Applicant intend for claim 165 to comprise at least three components? In claim 165, the metes and bounds of “configured to recruit an RNA editing entity” are unclear. It is unclear how an engineered circular guide RNA structurally differs from a “configured” engineered circular guide RNA. How does one skilled in the art distinguish an unconfigured circular guide RNA from a configured circular guide RNA? In claim 165, it is unclear what “recruit” constitutes. This term in not defined in Applicant’s disclosure. It is unclear how one skilled in the art can objectively determine that an RNA editing entity is recruited. Dependent claims 166 and 167 are included. Clarification and/or correction is required. Claim Rejections - 35 USC § 112(a) 4. Claims 165-167 are rejected under 35 U.S.C. 112(a) or 35 U.S.C. 112 (pre-AIA ), first paragraph, as failing to comply with the written description requirement. The claim(s) contains subject matter which was not described in the specification in such a way as to reasonably convey to one skilled in the relevant art that the inventor or a joint inventor, or for applications subject to pre-AIA 35 U.S.C. 112, the inventor(s), at the time the application was filed, had possession of the claimed invention. The recitation of “configured to recruit an RNA editing entity” lacks adequate written description for the following reasons. With regard to the recitation of “configured”, there is inadequate written description with regard to the structural configuration of the engineered circular guide RNA in a manner that would recruit an RNA editing entity. There is no disclosure as to what circular guide RNA configuration, when hybridized to the target RNA sequence, would recruit which corresponding RNA editing entity. This configuration and RNA editing entity appear to be specific, however, the configuration and the RNA editing entity are not recited in the claims. There is no disclosure as to the structure of the RNA editing entity, e.g., whether it is a nucleotide sequence, enzyme, chemical compound, etc. Accordingly, for the above reasons, the recitation of “configured to recruit an RNA editing entity” lacks adequate written description as commensurate in scope with the claims. Claim Rejections - 35 USC § 102 5. Claims 159, 160, 162, 163, 165-167 and 169-171 are rejected under 35 U.S.C. 102(a)(1) as being unpatentable over Zhang et al. (US Pub. No. 20190359971 (A)). With regard to claim 159, Zhang teaches an engineered circular guide RNA [0373] for editing a nucleotide in a target RNA sequence, wherein the engineered circular guide RNA comprises a targeting domain that forms a secondary structure comprising a mismatch between the targeting domain and the target RNA sequence upon hybridization ([0435], [0072]), wherein the mismatch is created by positioning guanosine or cytosine opposite adenosine (converted to an iosine) present in the target RNA sequence ([0232], 0233]) and at least one additional secondary structure comprising one or more stem loops upon hybridization to a target RNA sequence [0020]. With regard to claim 162, the targeting domain forms a plurality of loops of 6-12 nucleotides created 30-40 base pairs apart, wherein the mismatch is located within the 30-40 base pair region (Fig. 43A, [0155]). With regard to claim 163, the targeting domain comprises a sequence length of 25 nucleotides or more in length [0059]. With regard to claim 165, ADAR enzyme (adenosine deaminase acting on RNA) is the RNA editing entity that edits the target RNA sequence [0232]. With regard to claim 166, the editing of the target RNA sequence results in at least a partial knockdown of the edited RNA sequence [0215]. With regard to claim 167, the editing of the target RNA sequence results in a sense codon read as a stop codon [0868]. With regard to claims 170-171, Zhang teaches a liposome delivery vehicle and diluent ([0623]-[0624]). Accordingly, the claimed invention is anticipated by the prior art. Conclusion 6. No claim is allowed. 7. Any inquiry concerning this communication or earlier communications from the examiner should be directed to PHUONG T BUI whose telephone number is (571)272-0793. The examiner can normally be reached M-F 8am-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, Amjad Abraham can be reached at 571-270-7058. 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. /PHUONG T BUI/Primary Examiner, Art Unit 1663
Read full office action

Prosecution Timeline

Jun 01, 2022
Application Filed
May 02, 2025
Non-Final Rejection mailed — §102, §112
Sep 25, 2025
Response Filed
Dec 19, 2025
Final Rejection mailed — §102, §112
Feb 19, 2026
Response after Non-Final Action
Mar 19, 2026
Request for Continued Examination
Mar 21, 2026
Response after Non-Final Action
Jun 09, 2026
Non-Final Rejection mailed — §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

3-4
Expected OA Rounds
81%
Grant Probability
99%
With Interview (+23.2%)
2y 4m (~0m remaining)
Median Time to Grant
High
PTA Risk
Based on 1188 resolved cases by this examiner. Grant probability derived from career allowance rate.

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