Prosecution Insights
Last updated: September 17, 2026
Application No. 18/864,033

COMPOSITIONS USEFUL FOR MODULATING SPLICING

Non-Final OA §112§DP
Filed
Nov 08, 2024
Priority
May 12, 2022 — provisional 63/341,358 +1 more
Examiner
CHANDRAKUMAR, NIZAL S
Art Unit
Tech Center
Assignee
Skyhawk Therapeutics Inc.
OA Round
1 (Non-Final)
73%
Grant Probability
Favorable
1-2
OA Rounds
5m
Est. Remaining
91%
With Interview

Examiner Intelligence

Grants 73% — above average
73%
Career Allowance Rate
1298 granted / 1785 resolved
+12.7% vs TC avg
Strong +18% interview lift
Without
With
+18.3%
Interview Lift
resolved cases with interview
Typical timeline
2y 3m
Avg Prosecution
87 currently pending
Career history
1868
Total Applications
across all art units

Statute-Specific Performance

§101
2.2%
-37.8% vs TC avg
§103
29.2%
-10.8% vs TC avg
§102
10.9%
-29.1% vs TC avg
§112
36.8%
-3.2% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1785 resolved cases

Office Action

§112 §DP
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 . Claims 1-7, 14-17, 22-26, 28 are before the Examiner. Claim Rejections - 35 USC § 112 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 1-7, 14-17, 22-26, 28 are rejected under 35 U.S.C. 112, first paragraph, because the specification, while being enabling for making some possibilities of the claimed formula, does not reasonably provide enablement for plethora of conceivable compounds of these formulae. For example, it is not seen where in the specification enabling disclosure is found compounds wherein for any of the X3, X4 or X8 is N. The specification does not enable any person skilled in the art to which it pertains, or with which it is most nearly connected, to make and use the invention commensurate in scope with these claims. The determination that "undue experimentation" would have been needed to make and use the claimed invention is not a single, simple factual determination. Rather, it is a conclusion reached by weighing all the relevant factual considerations. Enablement is considered in view of the Wands factors (MPEP 2164.01 (a)). These include: (1) breadth of the claims; (2) nature of the invention; (3) state of the prior art; (4) amount of direction provided by the inventor; (5) the level of predictability in the art; (6) the existence of working examples; (7) quantity of experimentation needed to make or use the invention based on the content of the disclosure; and (8) relative skill in the art. All of the factors have been considered with regard to the claims, with the most relevant factors discussed below: Depending on the X3, X4 and X8, the claimed formula is drawn to many bicyclic ring systems crossing boundaries of patent classification systems. In addition these rings also have substituents layered on substituents encompassing wide variety and number of structures. These substituents and hence the compounds of given formula are drawn to species that vary widely in physical and chemical properties such as size, molecular weight, stereochemistry, logP, acidity, basicity, etc. These factors are known in the art (see multiple references cited below) to greatly influence biological properties, for example, binding interaction between target protein and small molecule and art recognized concepts relating to productive small molecule-macromolecule interaction. Enablement is a two prong (make and use) requirement. With regards to how to make, there are generic chemistry schemes 1-16 starting at page 169 for the different X possibilities, but working examples are limited to X3=X4=X8 being carbon based, as found in the Table starting at page 81. The specification is also silent with respect to procuring starting materials needed to make compounds of formula with any of the Xs being N. According to the U.S. Court of Customs and Patent Appeals in In re Argoudelis , De Boer, Eble, and Herr 168 USPQ 99 at 101, "[o]rdinarily no problem in this regard arises since the method of preparing almost all starting materials can be set forth in writing if the materials are not already known and available to the workers in the art, and when this is done the specification is enabling to the public". In re Argoudelis , De Boer, Eble, and Herr 168 USPQ 99 at 104, "it is essential that there be no question that, at the time an application for patent is filed, (emphasis in original) the invention claimed therein is fully capable of being reduced to practice (i.e., that no technological problems, the resolution of which would require more than ordinary skill and reasonable time, remain in order to obtain an operative, useful embodiment)." . Organic chemistry is unpredictable and capricious as taught by Dorwald F. A. Side Reactions in Organic Synthesis, 2005, Wiley: VCH, Weinheim pg. IX of Preface pg. 1-15 which teaches that ” …as will be shown throughout this book, the outcome of organic reactions is highly dependent on all structural features of a given starting material, and unexpected products may readily be formed. [8]……...Even the most experienced chemist will not be able to foresee all potential pitfalls of a synthesis, especially so if multifunctional, structurally complex intermediates must be prepared.…..” With regards to how to use: Biological properties are unpredictable and are ultimately tide to the chemical structure. See “Role of the Development Scientist in Compound Lead Selection and Optimization” by Venkatesh, J. Pharm. Sci. 89, 145-154 (2000) (p. 146, left column). Likewise, J. G. Cannon, Chapter Nineteen in Burger's Medicinal Chemistry and Drug Discovery, Fifth Edition, Volume I: Principles and Practice, Wiley-Interscience 1995, pp. 783-802, teaches many caveats in analog design such as the following at page 799 column B: Alteration of distances between portions of the pharmacophore of a molecule (or even' between other portions). may produce profound qualitative and/or quantitative changes in pharmacological actions. Biological data needed for the intended use (see method claim), is found at page 363. There are currently no established drugs that modulate splicing of ATXN3 pre-mRNA to ascertain how the disclosed data relate to . Structurally similar compounds show a wide gradation of activity consistent with the unpredictability in the art as per the teachings of Venkatesh and Cannon. Note that in University of Rochester v. G.D. Searle & Co., 68 USPQ2d 1424 at 1438, the screening for over 600 compounds was deemed to be undue. Applicant’s scope far exceeds this number. The specification must teach how to make and use the invention, not teach how to figure out for oneself how to make and use the invention. In re Gardner, 166 USPQ 138 (CCPA 1970). Therefore, one skilled in the art could not make or use the claimed invention without undue experimentation. There is no structural guidance such as pharmacophore definition disclosed in the specification to guide one of skill in the art to choose from the plethora possibilities recited for the variables, other than furo[3,2-b]pyridine compounds On top of this what combination of substituents would provide for predictable results is not obvious from the disclosure Pharmacological activity in general is a unpredictable area. Note that in cases involving physiological activity such as the instant case, “the scope of enablement obviously varies inversely with the degree of unpredictability of the factors involved”. See In re Fisher, 427 F.2d 833, 839, 166 USPQ 18, 24 (CCPA 1970). Genentech Inc. v. Novo Nordisk A/S (CA FC) 42 USPQ2d 1001, states “a patent is not a hunting license. It is not a reward for search, but compensation for its successful conclusion” and “[p]atent protection is granted in return. There is a substantial gap between what is taught in the specification and what is being claimed. For these reasons, one skilled in the art would be faced with undue amount of research. The specification lacks disclosure sufficient to make and use the invention, in predictable manner, commensurate with the scope of the claims. MPEP 2164.01(a) states, “A conclusion of Iack of enablement means that, based on the evidence regarding each of the above factors, the specification, at the time the application was filed, would not have taught one skilled in the art how to make and/or use the full scope of the claimed invention without undue experimentation. ln re Wright, 999 F.2d 1557,1562, 27 USPQ 2d 1510, 1513 (Fed. Cir. 1993).'' That conclusion is clearly justified here. Thus, undue experimentation would be required. Claim Rejections - 35 USC § 112 The following is a quotation of 35 U.S.C. 112(b): (b) CONCLUSION.—The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the inventor or a joint inventor regards as the invention. The following is a quotation of 35 U.S.C. 112 (pre-AIA ), second paragraph: The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the applicant regards as his invention. Claim 25 is 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. Claim 25 limitation depend on disclosure in the specification. MPEPE 2173.05(s) Reference to Figures or Tables [R-10.2019]. Where possible, claims are to be complete in themselves. Incorporation by reference to a specific figure or table “is permitted only in exceptional circumstances where there is no practical way to define the invention in words and where it is more concise to incorporate by reference than duplicating a drawing or table into the claim. Double Patenting The nonstatutory double patenting rejection is based on a judicially created doctrine grounded in public policy (a policy reflected in the statute) so as to prevent the unjustified or improper timewise extension of the “right to exclude” granted by a patent and to prevent possible harassment by multiple assignees. A nonstatutory double patenting rejection is appropriate where the conflicting claims are not identical, but at least one examined application claim is not patentably distinct from the reference claim(s) because the examined application claim is either anticipated by, or would have been obvious over, the reference claim(s). See, e.g., In re Berg, 140 F.3d 1428, 46 USPQ2d 1226 (Fed. Cir. 1998); In re Goodman, 11 F.3d 1046, 29 USPQ2d 2010 (Fed. Cir. 1993); In re Longi, 759 F.2d 887, 225 USPQ 645 (Fed. Cir. 1985); In re Van Ornum, 686 F.2d 937, 214 USPQ 761 (CCPA 1982); In re Vogel, 422 F.2d 438, 164 USPQ 619 (CCPA 1970); In re Thorington, 418 F.2d 528, 163 USPQ 644 (CCPA 1969). A timely filed terminal disclaimer in compliance with 37 CFR 1.321(c) or 1.321(d) may be used to overcome an actual or provisional rejection based on nonstatutory double patenting provided the reference application or patent either is shown to be commonly owned with the examined application, or claims an invention made as a result of activities undertaken within the scope of a joint research agreement. See MPEP § 717.02 for applications subject to examination under the first inventor to file provisions of the AIA as explained in MPEP § 2159. See MPEP § 2146 et seq. for applications not subject to examination under the first inventor to file provisions of the AIA . A terminal disclaimer must be signed in compliance with 37 CFR 1.321(b). The filing of a terminal disclaimer by itself is not a complete reply to a nonstatutory double patenting (NSDP) rejection. A complete reply requires that the terminal disclaimer be accompanied by a reply requesting reconsideration of the prior Office action. Even where the NSDP rejection is provisional the reply must be complete. See MPEP § 804, subsection I.B.1. For a reply to a non-final Office action, see 37 CFR 1.111(a). For a reply to final Office action, see 37 CFR 1.113(c). A request for reconsideration while not provided for in 37 CFR 1.113(c) may be filed after final for consideration. See MPEP §§ 706.07(e) and 714.13. The USPTO Internet website contains terminal disclaimer forms which may be used. Please visit www.uspto.gov/patent/patents-forms. The actual filing date of the application in which the form is filed determines what form (e.g., PTO/SB/25, PTO/SB/26, PTO/AIA /25, or PTO/AIA /26) should be used. A web-based eTerminal Disclaimer may be filled out completely online using web-screens. An eTerminal Disclaimer that meets all requirements is auto-processed and approved immediately upon submission. For more information about eTerminal Disclaimers, refer to www.uspto.gov/patents/apply/applying-online/eterminal-disclaimer. Claims 1-7, 14-17, 22-26, 28 are provisionally rejected on the ground of nonstatutory double patenting as being unpatentable over claims 1-7, 14-21, 23 of copending Application No. 18864035 (reference application). Although the claims at issue are not identical, they are not patentably distinct from each other because the conflicting claims contain overlapping subject matter. 18864035 Base claim 1 is drawn to compounds of formula PNG media_image1.png 480 558 media_image1.png Greyscale which has genus-species like relationship with respect to the ring atoms. Instant Base 1 is drawn to compounds of formula PNG media_image2.png 436 542 media_image2.png Greyscale X4 in instant formula is CR24 in the above formula. X7 in the above formula is CR27 in the instant formula. The limitations of the dependent claims are drawn to same substituents and method claims are drawn to same intended use. This is a provisional nonstatutory double patenting rejection because the patentably indistinct claims have not in fact been patented. Likewise (Likewise means for the genus-species like rationale) Claims 1-7, 14-17, 22-26, 28 are provisionally rejected on the ground of nonstatutory double patenting as being unpatentable over claims 1-7, 14-17, 22-26, 28 of copending Application No. 18864030 (reference application). Although the claims at issue are not identical, they are not patentably distinct from each other because the conflicting claims contain overlapping subject matter. 18864030 Base claim 1 is drawn to compounds of formula PNG media_image3.png 434 564 media_image3.png Greyscale This is a provisional nonstatutory double patenting rejection because the patentably indistinct claims have not in fact been patented. Any inquiry concerning this communication or earlier communications from the examiner should be directed to NIZAL S CHANDRAKUMAR whose telephone number is (571)272-6202. The examiner can normally be reached M-F 8-5 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, Andrew Kosar can be reached at (571) 272-0913. 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. /NIZAL S CHANDRAKUMAR/Primary Examiner, Art Unit 1625
Read full office action

Prosecution Timeline

Nov 08, 2024
Application Filed
Aug 13, 2026
Non-Final Rejection mailed — §112, §DP (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

1-2
Expected OA Rounds
73%
Grant Probability
91%
With Interview (+18.3%)
2y 3m (~5m remaining)
Median Time to Grant
Low
PTA Risk
Based on 1785 resolved cases by this examiner. Grant probability derived from career allowance rate.

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