Prosecution Insights
Last updated: July 17, 2026
Application No. 18/685,404

PURIFICATION METHOD AND USES THEREOF

Non-Final OA §101§112
Filed
Feb 21, 2024
Priority
Sep 28, 2021 — EU 21199535.2 +1 more
Examiner
PERRIN, CLARE M
Art Unit
1779
Tech Center
1700 — Chemical & Materials Engineering
Assignee
Chromacon AG
OA Round
1 (Non-Final)
68%
Grant Probability
Favorable
1-2
OA Rounds
6m
Est. Remaining
99%
With Interview

Examiner Intelligence

Grants 68% — above average
68%
Career Allowance Rate
510 granted / 751 resolved
+2.9% vs TC avg
Strong +42% interview lift
Without
With
+42.1%
Interview Lift
resolved cases with interview
Typical timeline
2y 11m
Avg Prosecution
30 currently pending
Career history
784
Total Applications
across all art units

Statute-Specific Performance

§101
0.7%
-39.3% vs TC avg
§103
72.2%
+32.2% vs TC avg
§102
5.5%
-34.5% vs TC avg
§112
12.7%
-27.3% vs TC avg
Black line = Tech Center average estimate • Based on career data from 751 resolved cases

Office Action

§101 §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 . Claim Status The Preliminary Amendment filed on 21 January 2024 has been entered; claims 1-28 remain pending. Claim Objections Claims 1, 3, 7, 11, 14, 25, and 27 are objected to because of the following informalities: regarding claim 1, step c is missing a comma before step d; regarding claim 3, it ends with a comma instead of a period; claims 7, 14, and 27 are objected to because “an electrolyte in such a(n organic or inorganic) solvent” would be more clearly recited as “an electrolyte in said organic or inorganic solvent”; regarding claim 11, steps c’, d’, e’, f’, and g’ are all missing commas before the next step; regarding claim 25, steps c’, d’, f’, and g’ are all missing commas before the next step; and regarding claim 27, “increased linearly increased” (line 23) should be recited with one instance of “increased”. Appropriate correction is 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. Claims 1-28 are 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. With respect to claim 1, the limitations “a feed mixture consisting of the product and at least two further components representing weakly adsorbing impurities and strongly adsorbing impurities” renders the claim indefinite, as “consisting of” should limit the feed mixture to only those components recited, and therefore is incompatible with the usage of open language “at least two further components…”). With continued reference to claim 1, the limitations “wherein the Recycling Phase consists of at least one recycling sequence comprising the following steps” renders the claim indefinite, as the usages of open language “at least one recycling sequence” and “recycling sequence comprising” are incompatible with “wherein the Recycling Phase consists of…”. With respect to claims, 9, 10, 24, and 25, the limitations “said adsorbers” and “the adsorber section” (multiple instances of each) render the claims indefinite, as it is unclear whether these limitations refer to the first or second adsorber sections. Applicant is respectfully asked to designate each adsorber (section) as a first or second adsorber section to be consistent throughout all the claims. With continued reference to claims 10 and 25, the limitations “said first batch start-up timespan” and “said second batch start-up timespan” render the claim indefinite as first and second batch start-up timespans are not recited in claims 9 and 24, therefore they lack antecedent basis in the claim language. With respect to claims 11 and 25, the limitations “the other adsorber section” (in steps a’, g’, and h’) render the claims indefinite, as either “upstream” or “downstream” designations should be used to enhance clarity. With respect to claim 12, the limitations “the other adsorber section” (occurs twice in second to last clause and last clause) render the claim indefinite, as either “upstream” or “downstream” designations should be used to enhance clarity. With respect to claim 13, it is unclear what “linear gradients” in line 2 refers to; Applicant may wish to recite “linear eluent gradients” to enhance clarity. With respect to claims 14 and 27, the limitations “most or all…interconnected steps” renders the claim indefinite, as the term “most” is a relative term which renders the claims indefinite. The term “most” is not defined by the claim, the specification does not provide a standard for ascertaining the requisite degree, and one of ordinary skill in the art would not be reasonably apprised of the scope of the invention. For the purposes of examination, the Examiner will interpret “most” as being met according to Paragraph [0126] of the Specification. With continued reference to claims 14 and 27, it is unclear to the Examiner what is meant by the limitations “recycling except for the case of a following final shutdown batch step and if applicable, of product elution and, if applicable, further recycling, wherein during said recycling the modifier concentration can be varied or just for the recycling kept constant to a highest concentration before the beginning of elution of the strongly adsorbing impurities” (end of each claim). Clarification is respectfully requested regarding what is being recycled and how that pertains to product elution and further recycling. Claims 15 and 28 provide for a process, but, since the claim does not set forth any steps involved in the method/process of use, it is unclear what method/process applicant is intending to encompass. A claim is indefinite where it merely recites a use without any active, positive steps delimiting how this use is actually practiced. Regarding claims 2-8, 16-23, and 26, they are rejected for being dependent on a rejected base claim. Claim Rejections - 35 USC § 101 35 U.S.C. 101 reads as follows: Whoever invents or discovers any new and useful process, machine, manufacture, or composition of matter, or any new and useful improvement thereof, may obtain a patent therefor, subject to the conditions and requirements of this title. Claims 15 and 28 are rejected under 35 U.S.C. 101 because the claimed recitation of a use, without setting forth any steps involved in the process, results in an improper definition of a process, i.e., results in a claim which is not a proper process claim under 35 U.S.C. 101. See for example Ex parte Dunki, 153 USPQ 678 (Bd.App. 1967) and Clinical Products, Ltd. v. Brenner, 255 F. Supp. 131,149 USPQ 475 (D.D.C. 1966) Allowable Subject Matter Claims 1-28 are allowed pending resolution of the claim objections, 112(b) rejections, and 101 rejections set forth above, as none of the prior art teaches or suggests the cyclic chromatographic purification method as recited in claim 1. The Examiner acknowledges D2 and D3 cited on the ISR and Written Opinion of the International Searching Authority: EP 2925419 A1 (see Abstract) and WO 2019/096622 A1 (see Abstract; Pages 5-6), in which are disclosed steps c through f of claim 1 without the inline dilution steps in the case of EP ‘419; however, these references do not disclose the a recycling phase as required by claim 1. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to CLARE M PERRIN whose telephone number is (571)270-5952. The examiner can normally be reached 9AM-6PM EST M-F. 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, Bob Ramdhanie can be reached at (571) 270-3240. 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. /CLARE M. PERRIN/ Primary Examiner Art Unit 1779 /CLARE M PERRIN/Primary Examiner, Art Unit 1779 23 June 2026
Read full office action

Prosecution Timeline

Feb 21, 2024
Application Filed
Jun 26, 2026
Non-Final Rejection mailed — §101, §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

1-2
Expected OA Rounds
68%
Grant Probability
99%
With Interview (+42.1%)
2y 11m (~6m remaining)
Median Time to Grant
Low
PTA Risk
Based on 751 resolved cases by this examiner. Grant probability derived from career allowance rate.

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