Prosecution Insights
Last updated: July 17, 2026
Application No. 16/825,269

BORONIC ESTER PRODRUGS AND USES THEREOF

Non-Final OA §112
Filed
Mar 20, 2020
Priority
May 20, 2019 — provisional 62/850,492
Examiner
BAKSHI, PANCHAM
Art Unit
1623
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
Dana-Farber Cancer Institute Inc.
OA Round
6 (Non-Final)
77%
Grant Probability
Favorable
6-7
OA Rounds
0m
Est. Remaining
99%
With Interview

Examiner Intelligence

Grants 77% — above average
77%
Career Allowance Rate
889 granted / 1155 resolved
+17.0% vs TC avg
Strong +30% interview lift
Without
With
+30.3%
Interview Lift
resolved cases with interview
Typical timeline
2y 3m
Avg Prosecution
64 currently pending
Career history
1226
Total Applications
across all art units

Statute-Specific Performance

§101
0.9%
-39.1% vs TC avg
§103
42.2%
+2.2% vs TC avg
§102
12.7%
-27.3% vs TC avg
§112
14.3%
-25.7% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1155 resolved cases

Office Action

§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 . 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and the fee set forth in 37 CFR 1.17(e) has been timely paid, the finality of the previous Office action has been withdrawn pursuant to 37 CFR 1.114.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 03/06/2026 has been entered. Status of the Application Claims 86, 91, 94, 108-110, 117-130, 132, 134-142, 143-145 are pending, of which claims 91, 94, and 141, 144-145 are withdrawn from further consideration pursuant to 37 CFR 1.142(b), as being drawn to a nonelected invention, there being no allowable generic or linking claim. Claims 86, 108-110, 117-130, 132, 134-140, 142 and 143 are under current examination. Objection Claim 86, is objected as the claim at several instances recites abbreviations. For example, claim 86 recites CA-170, EICAR, EB1089 etc. This is the first time these abbreviations appear in the claims and must be defined. Appropriate correction required. Claim Rejections - 35 USC § 112(a) -Written Description The following is a quotation of the first paragraph of U.S.C. 112(a): (a) IN GENERAL.—The specification shall contain a written description of the invention, and of the manner and process of making and using it, in such full, clear, concise, and exact terms as to enable any person skilled in the art to which it pertains, or with which it is most nearly connected, to make and use the same, and shall set forth the best mode contemplated by the inventor or joint inventor of carrying out the invention. The following is a quotation of the first paragraph of pre-AIA 35 U.S.C. 112: The specification shall contain a written description of the invention, and of the manner and process of making and using it, in such full, clear, concise, and exact terms as to enable any person skilled in the art to which it pertains, or with which it is most nearly connected, to make and use the same, and shall set forth the best mode contemplated by the inventor of carrying out his invention. Claims 86, 108-110, 117-130, 132, 134-140, 142 and 143 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 pre-AIA the inventor(s), at the time the application was filed, had possession of the claimed invention. The instant claims are directed to a polymer having repeating units: PNG media_image1.png 722 929 media_image1.png Greyscale PNG media_image2.png 837 1008 media_image2.png Greyscale PNG media_image3.png 846 992 media_image3.png Greyscale PNG media_image4.png 773 1022 media_image4.png Greyscale PNG media_image5.png 837 1004 media_image5.png Greyscale PNG media_image6.png 239 881 media_image6.png Greyscale PNG media_image7.png 763 1022 media_image7.png Greyscale PNG media_image8.png 376 936 media_image8.png Greyscale PNG media_image9.png 795 990 media_image9.png Greyscale Thus, claim 86 is drawn to millions of polymers of varied structure. Said genus of polymers is not adequately defined in the instant specification. The MPEP states that for a generic claim, the genus can be adequately described if the disclosure presents a sufficient number of representative species in examples that encompass the genus. (MPEP § 2163). A "representative number of species" means that the species which are adequately described are representative of the entire genus. Thus, when there is substantial variation within the genus, one must describe a sufficient variety of species to reflect the variation within the genus. See AbbVie Deutschland GmbH & Co., KG v. Janssen Biotech, Inc., 759 F.3d 1285, 1300, 111 USPQ2d 1780, 1790 (Fed. Cir. 2014) (Claims directed to a functionally defined genus of antibodies were not supported by a disclosure that "only describe[d] one type of structurally similar antibodies" that "are not representative of the full variety or scope of the genus."). An adequate written description of a chemical invention also requires a precise definition, such as by structure, formula, chemical name, or physical properties, and not merely a wish or plan for obtaining the chemical invention claimed. See, e.g., Univ. of Rochester v. G.D. Searle & Co., 358 F.3d 916, 927, 69 USPQ2d 1886, 1894-95 (Fed. Cir. 2004) (The patent at issue claimed a method of selectively inhibiting PGHS-2 activity by administering a non-steroidal compound that selectively inhibits activity of the PGHS-2 gene product, however the patent did not disclose any compounds that can be used in the claimed methods. While there was a description of assays for screening compounds to identify those that inhibit the expression or activity of the PGHS-2 gene product, there was no disclosure of which peptides, polynucleotides, and small organic molecules selectively inhibit PGHS-2. The court held that "[w]ithout such disclosure, the claimed methods cannot be said to have been described."). If the genus has a substantial variance, the disclosure must describe a sufficient variety of species to reflect the variation within that genus. Furthermore, for a broad generic claim, the specification must provide adequate written description to identify the genus of the claim. In Regents of the University of California v. Eli Lilly & Co. the court stated: "A written description of an invention involving a chemical genus, like a description of a chemical species, 'requires a precise definition, such as by structure, formula, [or] chemical name,' of the claimed subject matter sufficient to distinguish it from other materials." Fiers, 984 F.2d at 1171, 25 USPQ2d 1601; In re Smythe, 480 F.2d 1376, 1383, 178 USPQ 279, 284985 (CCPA 1973) ("In other cases, particularly but not necessarily, chemical cases, where there is unpredictability in performance of certain species or subcombinations other than those specifically enumerated, one skilled in the art may be found not to have been placed in possession of a genus ...") Regents of the University of California v. Eli Lilly & Co., 43 USPQ2d 1398. The applicants have broadly claimed a polymer having any structure as long as the polymer has a repeating unit, which again comprise (having any structure) any structure as long as the structure has moiety of formula: PNG media_image10.png 148 457 media_image10.png Greyscale .Further, formula: PNG media_image10.png 148 457 media_image10.png Greyscale itself may comprise millions of structures. It is unquestionable that claims 86, 108-110, 117-130, 132, 134-140, 142 and 143 are broad and generic, with respect to all possible polymers encompassed by claim 86. There is a very large number of structural variations encompassed by the polymer. The claims lack in written description because the specification lacks sufficient variety of species to reflect this variance in the genus. The specification provides guidance to a very limited number of polymers, 4 polymers. For example, the instant claims do not include a structure of polymer, other than definition of reactants and polymer that may comprise any unit any structure, substituted, unsubstituted etc., as long as the polymer comprises repeating unit: PNG media_image10.png 148 457 media_image10.png Greyscale . The instant specification provides synthesis of only 4 polymers with only two type of M, Bortezomib, and Ixazomib only one type of linker (L1 as in claims 121-124; L1a as in claims 125-127; and L as in claims 134-135) Vs millions of polymers encompassed by the instant claims. "The description requirement of the patent statute requires a description of an invention, not an indication of a result that one might achieve if one made that invention."). Having analyzed the claims with regard to the written description guidelines, the specification does not provide sufficient descriptive support for the myriad of polymers embraced by the claims. There are millions of combinations of elements X, L1, L1a, L, R1, M with any substitution, structure, linkage in the reactants itself as well as broadly defined any polymer of any structure with only one constraint of having a repeating unit of formula: PNG media_image10.png 148 457 media_image10.png Greyscale , which again may comprise any structure, embraced by the instant claims. Considering the lack of guidance provided in the specification, one of ordinary skill in the art would be burdened with undue experimentation to practice the invention commensurate in the scope of claims 86, 108-110, 117-130, 132, 134-140, 142 and 143. Response to Applicant’s remarks Applicant’s remarks, IDS and amendment, filed on 05/05/2026, have been fully considered but not found persuasive. Applicant argued that claims are amended and complies with 112a, written description requirement and therefore claims should be allowed. This is not found persuasive as the amended instant claims doesn’t complies with 112a, written description requirement. Please see rejection as set forth above. Conclusion No Claim is allowed. Any inquiry concerning this communication or earlier communications from the examiner should be directed to PANCHAM BAKSHI whose telephone number is (571)270-3463. The examiner can normally be reached M-Thu 7-4.30 EST. 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, Milligan Adam can be reached at 571-2707674. 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. /PANCHAM BAKSHI/Primary Examiner, Art Unit 1623
Read full office action

Prosecution Timeline

Show 22 earlier events
Mar 06, 2026
Request for Continued Examination
Mar 17, 2026
Examiner Interview Summary
Mar 17, 2026
Applicant Interview (Telephonic)
Mar 20, 2026
Response after Non-Final Action
Mar 22, 2026
Interview Requested
Mar 31, 2026
Applicant Interview (Telephonic)
Apr 01, 2026
Examiner Interview Summary
Jun 18, 2026
Non-Final Rejection mailed — §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

6-7
Expected OA Rounds
77%
Grant Probability
99%
With Interview (+30.3%)
2y 3m (~0m remaining)
Median Time to Grant
High
PTA Risk
Based on 1155 resolved cases by this examiner. Grant probability derived from career allowance rate.

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