Prosecution Insights
Last updated: May 29, 2026
Application No. 18/548,530

PROCESS FOR PREPARING ALKYL-4-OXOTETRAHYDROFURAN-2-CARBOXYLATE

Non-Final OA §112
Filed
Aug 31, 2023
Priority
Mar 03, 2021 — EU 21160525.8 +1 more
Examiner
FERGUSON, JALISA HOLMES
Art Unit
1626
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
BAYER AKTIENGESELLSCHAFT
OA Round
1 (Non-Final)
70%
Grant Probability
Favorable
1-2
OA Rounds
6m
Est. Remaining
99%
With Interview

Examiner Intelligence

Grants 70% — above average
70%
Career Allowance Rate
21 granted / 30 resolved
+10.0% vs TC avg
Strong +56% interview lift
Without
With
+56.3%
Interview Lift
resolved cases with interview
Typical timeline
3y 2m
Avg Prosecution
10 currently pending
Career history
48
Total Applications
across all art units

Statute-Specific Performance

§103
17.2%
-22.8% vs TC avg
§102
26.6%
-13.4% vs TC avg
§112
21.9%
-18.1% vs TC avg
Black line = Tech Center average estimate • Based on career data from 30 resolved cases

Office Action

§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 Status of the Claims Claims 1-10 are pending. Claims 1-10 are rejected. Priority This application is a 35 U.S.C. 371 National Stage Filing of International Application No. PCT/EP2022/054924, filed 02/28/2022, which claims priority under 35 U.S.C. 119(a-d) to EP 21160525.8, filed 03/03/2021. Acknowledgment is made of applicant's claim for foreign priority. It is noted, however, that applicant has not filed an English translation of the certified copy of the EP 21160525.8 application as required by 37 CFR 1.55. Therefore, the effective filing date is 02/28/2022. Information Disclosure Statement The information disclosure statements (IDS) dated 02/23/2024 and 11/12/2025 have been considered. Claim Rejections - 35 USC § 112(b) 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. Claims 1-10 are rejected under 35 U.S.C. 112(b) being indefinite for failing to particularly point out and distinctly claim the subject matter which the inventor or a joint inventor regards as the invention. Claims 1-10 are directed to methods of preparing compounds of general formula (I). However, given the open language of the claims, i.e. “characterized in that”, it is unclear what method steps are claimed. MPEP 2111.03 states: “The transitional term "comprising", which is synonymous with "including," "containing," or "characterized by," is inclusive or open-ended and does not exclude additional, unrecited elements or method steps. See, e.g., Mars Inc. v. H.J. Heinz Co., 377 F.3d 1369, 1376, 71 USPQ2d 1837, 1843 (Fed. Cir. 2004)”. Accordingly, the metes and bounds of the claims cannot be sufficiently interpreted by a person having ordinary skill in the art. Thus, claims 1-10 are indefinite. Applicant may amend the claims to distinctly claim the subject matter which the inventor regards as the invention. It is suggested that the claims should be amended to replace “characterized in that” with “wherein”. Allowable Subject Matter Claims 1-10 are free of the prior art. Osaka et al. represent the closest art in “Synthesis and Properties of New Polyesters Having Tetrahydrofuran Rings in Their Main Chains”, Journal of Polymer Science Part A: Polymer Chemistry Edition, 1993, pp. 1135-1140, Vol. 31, No. 5, as cited in the IDS dated 02/23/2024. Osaka et al. teach synthesis of intermediate 10, which is embraced by instant formula (I) wherein R1 is methyl, via a similar process as the instant application: PNG media_image1.png 250 487 media_image1.png Greyscale . See Scheme 1, page 1136. The difference in the presently claimed invention is the use of a metal tert-butoxide reagent to generate the cyclized product of instant formula (IV), which corresponds to prior art compound 9 in the Scheme above. Additionally, the instant invention does not require the use of acid-catalyzed dealkoxycarbonylation and diazomethane as cited in the prior art in order to yield the desired compound. Further, there is no teaching, suggestion, or motivation in the prior art that would lead a person having ordinary skill in the art to modify Okada in such a way as to identify the presently claimed process. Contact Information Any inquiry concerning this communication or earlier communications from the examiner should be directed to Jalisa H. Ferguson whose telephone number is (703)756-1489. The examiner can normally be reached Monday - Friday 9:00am - 5:00pm. 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, Amy L. Clark can be reached on (571) 272-1310. 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. /J.H.F./Examiner, Art Unit 1626 /KAMAL A SAEED/Primary Examiner, Art Unit 1626
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Prosecution Timeline

Aug 31, 2023
Application Filed
May 19, 2026
Non-Final Rejection mailed — §112 (current)

Precedent Cases

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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
70%
Grant Probability
99%
With Interview (+56.3%)
3y 2m (~6m remaining)
Median Time to Grant
Low
PTA Risk
Based on 30 resolved cases by this examiner. Grant probability derived from career allowance rate.

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