Prosecution Insights
Last updated: July 17, 2026
Application No. 18/571,625

PROCESS FOR THE PREPARATION OF N-HYDROXYPYRIDONE COMPOUNDS

Non-Final OA §102
Filed
Dec 18, 2023
Priority
Jul 19, 2021 — EU 21186503. +1 more
Examiner
SAEED, KAMAL A
Art Unit
1623
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
Clariant International Ltd.
OA Round
1 (Non-Final)
84%
Grant Probability
Favorable
1-2
OA Rounds
0m
Est. Remaining
93%
With Interview

Examiner Intelligence

Grants 84% — above average
84%
Career Allowance Rate
1010 granted / 1205 resolved
+23.8% vs TC avg
Moderate +10% lift
Without
With
+9.6%
Interview Lift
resolved cases with interview
Fast prosecutor
2y 0m
Avg Prosecution
16 currently pending
Career history
1227
Total Applications
across all art units

Statute-Specific Performance

§101
0.4%
-39.6% vs TC avg
§103
5.8%
-34.2% vs TC avg
§102
3.1%
-36.9% vs TC avg
§112
3.1%
-36.9% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1205 resolved cases

Office Action

§102
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 . Claims 1-13 are canceled. Therefore, claims 14-26 are currently pending in this Application. Priority CONTINUING DATA This application is a 371 of PCT/EP2022/070105 07/18/2022 FOREIGN APPLICATIONS EPO EP21186503. 07/19/2021 Information Disclosure Statement Applicant’s Information Disclosure Statement, filed on January 23, 2024 has been considered. Please refer to Applicant’s copies of the 1449 submitted herewith. Response to Restriction Applicants’ election, without traverse, the following species: For formula I, 1-hydroxy-4-methyl-6-(2,4,4- trimethylpentyl)pyridin-2-one (CAS No. 50650-76-5). PNG media_image1.png 269 462 media_image1.png Greyscale For formula II, (4-methyl-6-(2,4,4-trimethylpentyl)-2H- pyran-2-one) (CAS No. 50650-75-4), PNG media_image2.png 246 352 media_image2.png Greyscale in response filed March 05, 2026 is acknowledged. Therefore, the restriction requirement is considered proper and is maintained. Applicant is reminded that upon the cancellation of claims to a non-elected invention, the inventorship must be amended in compliance with 37 CFR 1.48(b) if one or more of the currently named inventors is no longer an inventor of at least one claim remaining in the application. Any amendment of inventorship must be accompanied by a petition under 37 CFR 1.48(b) and by the fee required under 37 CFR 1.17(i). The scope of the invention of the elected subject matter is as follows: Upon further review and search of the claimed subject matter, the examiner is withdrawing the election of species requirement and full scope of the pending claims were examined on their merits. Therefore, the election of species requirement mailed on February 11, 2026 is hereby withdraw, Claim Rejections - 35 USC § 102 In the event the determination of the status of the application as subject to AIA 35 U.S.C. 102 and 103 (or as subject to pre-AIA 35 U.S.C. 102 and 103) is incorrect, any correction of the statutory basis for the rejection will not be considered a new ground of rejection if the prior art relied upon, and the rationale supporting the rejection, would be the same under either status. The following is a quotation of the appropriate paragraphs of 35 U.S.C. 102 that form the basis for the rejections under this section made in this Office action: A person shall be entitled to a patent unless – (a)(1) the claimed invention was patented, described in a printed publication, or in public use, on sale or otherwise available to the public before the effective filing date of the claimed invention. Claims 14, 15 and 18-26 are rejected, under 35 U.S.C. 102(a)(1) as being anticipated by GB 1416397. The present invention is drawn to a process of preparing products of Formula I, PNG media_image3.png 174 166 media_image3.png Greyscale , depicted in claim 14, comprising the steps: reacting products of Formula II, PNG media_image4.png 132 174 media_image4.png Greyscale with hydroxylamine or hydroxylammonium compound; and crystalizing or precipitating the product of Formula I, from an organic solvent. GB 1416397 teaches a process where a product of Formula (II) is reacted with hydroxylamine or a salt thereof to produce a product of Formula (I) i.e. the same as step (a) of the current process). In Example 1 of GB 1416397 teach that first step reaction is followed by extraction by crystallization (i.e. the same as step (b) of the current process) see lines 88-102. In regards to claims 18-26, GB 1416397 teaches the use of base ( see lines 47-48), inert solvent (see lines 65-67), reaction temperature (lines 62-64), alkali metal hydroxide (see line 96) that read on the instant claims. In regards to claim 20, the prior art is silent about the crystallization step temperature. Since both the prior art and the instant process have the same steps in preparing the same products, it is inherent that both processes use similar temperature for the crystallization step. Therefore, claims 14, 15 and 18-26 are anticipated by GB 1416397. Claim Objections Claims 16 and 17 are objected to depending on a rejected base claim, but would be allowable if rewritten in independent form including all of the limitations of the base claim and any intervening claims. Telephone Inquiry Any inquiry concerning this communication or earlier communications from the examiner should be directed to KAMAL A SAEED whose telephone number is (571) 272-0705. 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, Adam C Milligan can be reached at (571)270-7674. 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 /Kamal A Saeed/ Primary Examiner, Art Unit 1626
Read full office action

Prosecution Timeline

Dec 18, 2023
Application Filed
Jun 03, 2026
Non-Final Rejection mailed — §102 (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
84%
Grant Probability
93%
With Interview (+9.6%)
2y 0m (~0m remaining)
Median Time to Grant
Low
PTA Risk
Based on 1205 resolved cases by this examiner. Grant probability derived from career allowance rate.

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