Prosecution Insights
Last updated: August 14, 2026
Application No. 19/204,258

SYSTEM FOR GENERATING RADIOISOTOPES

Non-Final OA §103
Filed
May 09, 2025
Priority
Dec 29, 2014 — provisional 62/097,235 +5 more
Examiner
GARNER, LILY CRABTREE
Art Unit
3646
Tech Center
3600 — Transportation & Electronic Commerce
Assignee
Terrapower Isotopes LLC
OA Round
2 (Non-Final)
68%
Grant Probability
Favorable
2-3
OA Rounds
2y 1m
Est. Remaining
84%
With Interview

Examiner Intelligence

Grants 68% — above average
68%
Career Allowance Rate
392 granted / 576 resolved
+16.1% vs TC avg
Strong +15% interview lift
Without
With
+15.4%
Interview Lift
resolved cases with interview
Typical timeline
3y 4m
Avg Prosecution
57 currently pending
Career history
620
Total Applications
across all art units

Statute-Specific Performance

§101
7.2%
-32.8% vs TC avg
§103
45.1%
+5.1% vs TC avg
§102
16.1%
-23.9% vs TC avg
§112
30.7%
-9.3% vs TC avg
Black line = Tech Center average estimate • Based on career data from 576 resolved cases

Office Action

§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 . Continued Examination Under 37 CFR 1.114 A request for continued examination under 37 CFR 1.114, including the fee set forth in 37 CFR 1.17(e), was filed in this application after final rejection. Since this application is eligible for continued examination under 37 CFR 1.114, and the fee set forth in 37 CFR 1.17(e) has been timely paid, the finality of the previous Office action has been withdrawn pursuant to 37 CFR 1.114. Applicant's submission filed on 07/10/2026 has been entered. Status of Claims Claims 21–23 and 25–37 are under examination. Following receipt of the 07/10/2026 IDS, prosecution is hereby re-opened. Examiner finds that the NPL “Boll” submitted 07/10/2026 necessitates Applicant’s consideration as combined with Bennett, detailed below, prior to a Notice of Allowance. Claim Rejections - 35 USC § 103 The text of those sections of Title 35, U.S. Code 103 not included in this action can be found in a prior Office action. Claims 21–23 and 25–37 are rejected under 35 U.S.C. 103 as being unpatentable over Bennett (US 5,802,439) in view of Boll (Production of actinium-225 for alpha particle mediated radioimmunotherapy [submitted via IDS]). Regarding claim 21, Bennet discloses a system for generating radioisotopes comprising: one or more containers (22), including a first container, the first container containing source material (molybdenum) that includes at least one target material (100Mo, col. 14, l. 24); a radiation generator (leftward-facing triangle within 12 that generates electrons 14); a radiation bombardment chamber (12) that receives radiation (photons 20) from the radiation generator, the radiation bombardment chamber adapted to hold and expose the one or more containers (22) to the received radiation (20), thereby creating at least some first radioisotopes (99Mo) that are a direct product of the exposure of the target material to the radiation (99Mo is generated from the 100Mo target, col. 14, ll. 22-24); a mechanism to transfer an extraction material (solvent HNO3, col. 14, l. 38) into the first container (same container now labeled as 24), thereby contacting the source material (molybdenum) within the first container (24) with the extraction material (HNO3), the extraction material selected to dissolve, without dissolving the target material, one or more of: the at least some first radioisotopes (99Mo), a second radioisotope that is a daughter product of the at least some first radioisotopes, or both the at least some first radioisotopes and the second radioisotope, thereby generating a dissolved radioisotope; and an extraction component (not labeled but necessarily present as described in col. 14, ll. 43-45 and shown as leftward arrow from 26 to 30, including a new container surrounding 30 that receives the extraction) adapted to remove the extraction material with the dissolved radioisotope (extraction material + dissolved 99Mo = 30) from the first container (24) without removing the target material from the first container (99Mo is dissolved and removed, leaving the undissolved target material behind, to produce the product of a “dried 99Mo compound [that] consists of 99MoO3,” col. 14, l. 53). Bennett does not explicitly state that the mechanism is an insertion component. Boll does. Boll is in the same art area of radioisotope production and teaches an insertion component to transfer HNO3 material into a container (“The separation of [desired radioisotopes] is achieved using the marcoporous [sic] anion exchange resin MP1 in 8M HNO3 media. Two sequential MP1/NO3 columns provide a separation factor of ~106 for [the desired radioisotopes],” abstract). The ordinary skilled artisan would have been, prior to the effective filing date of the invention, motivated to utilize the insertion component such as the exchange column as suggested by Boll using HNO3 media, as does Bennett, in order to insert the extraction material into the container to obtain the desired radioisotopes. Any claim not specifically addressed in this section that depends from a rejected claim is also rejected under 35 U.S.C. 103 for its dependency upon an above–rejected claim and for the same reasons. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to LILY C GARNER whose telephone number is (571)272-9587. The examiner can normally be reached 9-5 CT. 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, Jack Keith can be reached at (571) 272-6878. 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. LILY CRABTREE GARNER Primary Examiner Art Unit 3646 /LILY C GARNER/Primary Examiner, Art Unit 3646
Read full office action

Prosecution Timeline

May 09, 2025
Application Filed
Feb 25, 2026
Non-Final Rejection mailed — §103
May 26, 2026
Response Filed
Jul 10, 2026
Request for Continued Examination
Jul 20, 2026
Response after Non-Final Action
Jul 28, 2026
Non-Final Rejection mailed — §103 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

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SEPARATION OF FISSION PRODUCTS IN A MOLTEN SALT REACTOR VIA ADSORBENT FRAMEWORKS
1y 10m to grant Granted Aug 11, 2026
Patent 12700515
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4y 2m to grant Granted Aug 04, 2026
Patent 12700513
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3y 2m to grant Granted Aug 04, 2026
Patent 12700514
FUEL ELEMENT WITH MULTI-SMEAR DENSITY FUEL
2y 11m to grant Granted Aug 04, 2026
Patent 12694995
Composite Uranium Silicide-Uranium Dioxide Nuclear Fuel
5y 5m to grant Granted Jul 28, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

2-3
Expected OA Rounds
68%
Grant Probability
84%
With Interview (+15.4%)
3y 4m (~2y 1m remaining)
Median Time to Grant
Moderate
PTA Risk
Based on 576 resolved cases by this examiner. Grant probability derived from career allowance rate.

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