Prosecution Insights
Last updated: October 04, 2026
Application No. 18/234,826

2-S RIMANTADINE AND 2-R RIMANTADINE FOR TREATING CANCER

Final Rejection §103
Filed
Aug 16, 2023
Priority
Feb 16, 2021 — provisional 63/150,027 +2 more
Examiner
YOO, SUN JAE
Art Unit
1621
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
Toragen, Inc.
OA Round
2 (Final)
71%
Grant Probability
Favorable
3-4
OA Rounds
0m
Est. Remaining
71%
With Interview

Examiner Intelligence

Grants 71% — above average
71%
Career Allowance Rate
879 granted / 1237 resolved
+11.1% vs TC avg
Minimal +0% lift
Without
With
+0.3%
Interview Lift
resolved cases with interview
Typical timeline
2y 8m
Avg Prosecution
97 currently pending
Career history
1309
Total Applications
across all art units

Statute-Specific Performance

§101
1.1%
-38.9% vs TC avg
§103
17.2%
-22.8% vs TC avg
§102
27.7%
-12.3% vs TC avg
§112
33.8%
-6.2% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1237 resolved cases

Office Action

§103
DETAILED ACTION Notice of Pre-AIA or AIA Status 1. The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA . Information Disclosure Statement 2. The information disclosure statements (dated July 17, 2026 and May 30, 2026 and April 6, 2026) were in compliance with the provisions of 37 CFR 1.97 and 37 CFR 1.98. The statements were considered. Signed copies of form 1449 are enclosed herewith. Response to Amendment 3. The rebuttal arguments filed on June 24, 2026 have been fully considered, however, they are not found to be persuasive. Below are responses to Applicant’s remarks. The claims were previously rejected as being unpatentable over WO 2020118096 in view of Moreno et al. WO 202011809 teaches the administration of racemic rimantadine HCl for the treatment of cancer which includes head and neck cancer. It was determined that the purification of an old product to result in an enantiomerically pure product does not impart patentability. MPEP 2144.04 VII. The skilled artisan has the motivation and reasonable expectation of success in preparing and administering enantiopure 2S rimantadine HCl for the treatment of head and neck cancer. Applicants have traversed the rejection by providing arguments and a declaration that shows unexpected results of 2S rimantadine HCl vs. 2R rimantadine. The arguments are noted. However, the declaration does not show unexpected results of 2S rimantadine HCl vs. the racemic mixture. As such, the declaration is not persuasive in overcoming the outstanding rejection. Applicants are invited to show unexpected results of the enantiopure 2S rimantadine vs. the racemic mixture. For the reasons stated above, it is maintained that the 35 USC 103 rejection is proper. All claims remain rejected. This ground of rejection is hereby made FINAL. 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 SUN JAE YOO whose telephone number is (571)272-9074. The examiner can normally be reached Mon-Fri 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. 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. /SUN JAE YOO/Primary Examiner, Art Unit 1621
Read full office action

Prosecution Timeline

Aug 16, 2023
Application Filed
Mar 04, 2024
Response after Non-Final Action
Nov 21, 2025
Applicant Interview (Telephonic)
Nov 21, 2025
Examiner Interview Summary
Mar 25, 2026
Non-Final Rejection mailed — §103
Jun 24, 2026
Response after Non-Final Action
Jun 24, 2026
Response Filed
Sep 02, 2026
Final Rejection mailed — §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
71%
Grant Probability
71%
With Interview (+0.3%)
2y 8m (~0m remaining)
Median Time to Grant
Moderate
PTA Risk
Based on 1237 resolved cases by this examiner. Grant probability derived from career allowance rate.

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