Prosecution Insights
Last updated: July 17, 2026
Application No. 18/199,802

POROUS MEMBRANE COMPOSITES WITH CROSSLINKED FLUORINATED IONOMER

Non-Final OA §103§112
Filed
May 19, 2023
Priority
May 20, 2022 — provisional 63/344,253
Examiner
MENON, KRISHNAN S
Art Unit
1777
Tech Center
1700 — Chemical & Materials Engineering
Assignee
Entegris Inc.
OA Round
3 (Non-Final)
60%
Grant Probability
Moderate
3-4
OA Rounds
1m
Est. Remaining
72%
With Interview

Examiner Intelligence

Grants 60% of resolved cases
60%
Career Allowance Rate
898 granted / 1500 resolved
-5.1% vs TC avg
Moderate +12% lift
Without
With
+11.8%
Interview Lift
resolved cases with interview
Typical timeline
3y 3m
Avg Prosecution
67 currently pending
Career history
1563
Total Applications
across all art units

Statute-Specific Performance

§101
0.5%
-39.5% vs TC avg
§103
83.6%
+43.6% vs TC avg
§102
7.6%
-32.4% vs TC avg
§112
4.4%
-35.6% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1500 resolved cases

Office Action

§103 §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 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. Claims 1-11 and 23 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. The element of claim 1, “fluorinated polymer backbone iodine atoms, bromine atoms, or a combination thereof at locations between fluorocarbon backbones” is unclear and indefinite. This element appears grammatically insufficient. The corresponding disclosure is in [0022,] which says: “[t]he iodine or bromine atoms are present within the polymer at locations between polymer (fluorocarbon) backbones, i.e., the iodine or bromine atoms connect one polymeric backbone to another polymeric backbone.” This also is unclear since Br and I do not form two bonds to attach to different carbons atoms to form a link as suggested by this disclosure. Claim 1 was also objected to in the advisory action as in improper format for failing to underline the above cited limitation as newly added element. Claim 10: recitation of fluoropolymer and PVdF together makes an improper Markush group because PVdF is a fluoropolymer. Claim 23 is indefinite – claim 1 is not a process claim and already recites the membrane composite. The following is a quotation of 35 U.S.C. 112(d): (d) REFERENCE IN DEPENDENT FORMS.—Subject to subsection (e), a claim in dependent form shall contain a reference to a claim previously set forth and then specify a further limitation of the subject matter claimed. A claim in dependent form shall be construed to incorporate by reference all the limitations of the claim to which it refers. Claims 3, 7, 10, 11 and 23 are rejected under 35 U.S.C. 112(d) or pre-AIA 35 U.S.C. 112, 4th paragraph, as being of improper dependent form for failing to further limit the subject matter of the claim upon which it depends, or for failing to include all the limitations of the claim upon which it depends. Limitations of claims 3, 7 and 12 are now included in claim1. Claim 10 is much broader in scope than claim 1. Claim 11 does not add further structure to claim 1 because “membrane” is a specie in the genus of “filters.” Applicant may cancel the claim(s), amend the claim(s) to place the claim(s) in proper dependent form, rewrite the claim(s) in independent form, or present a sufficient showing that the dependent claim(s) complies with the statutory requirements. Claim Rejections - 35 USC § 103 The following is a quotation of 35 U.S.C. 103 which forms the basis for all obviousness rejections set forth in this Office action: A patent for a claimed invention may not be obtained, notwithstanding that the claimed invention is not identically disclosed as set forth in section 102, if the differences between the claimed invention and the prior art are such that the claimed invention as a whole would have been obvious before the effective filing date of the claimed invention to a person having ordinary skill in the art to which the claimed invention pertains. Patentability shall not be negated by the manner in which the invention was made. Claim(s) 1-11 and 23 are rejected under 35 U.S.C. 103 as being unpatentable over Gjoka et al (US 2012/0118816) in view of EP 3936557 and Yandrasits et al (US 2020/0368690.) Gjoka (common inventor and same applicant as in the instant application) discloses the invention as claimed, except for the thermal radical initiator (like Luperox or bis-olefin) used for crosslinking. Claims require the membrane to be free of such initiators, which can be potentially present if this path of cross-linking is used. The instant claim 2 recites presence of UV initiators in the membrane. However, using UV in place of thermal cross-linking is known in the art. UV cross-linking also has advantages over thermal because the cross-linking can be carried out at lower temperatures and has other advantages – see EP, [0033]. Therefore, it would have been obvious to one of ordinary skill in the art to use UV in place of heat for crosslinking the ionomers. Regarding the support or the substrate membrane, while Gjoka teaches fluorocarbon polymers in [0096], they do not include PVdF or the other recited polymers. Yandrasits in a similar ionomer membrane teaches supports like PE, polysulfone and polyphenylenesulfone for improved mechanical strength and in multiple layers. See Yandrasits, [0126-0134]. The fluoropolymer-ionomer membrane is formed on the support membrane using UV curing. Therefore, Yandrasits offers a wider choice of supports compared to Gjoka. Therefore it would have been obvious to one of ordinary skill to use the teachings of EP and Yandrasits in the teaching of Gjoka to have the advantages taught by EP and Yandrasits. Particle size limitation – see [0039]. Flow limitation – see [021]. 17.35 cm2 membrane = 47 mm disc membrane. Dependent claims: since the disclosure in Gjoka is substantially same as in instant application, the resultant membrane also would inherently have the same or similar properties as claimed, unless otherwise shown. "[T]he discovery of a previously unappreciated property of a prior art composition, or of a scientific explanation for the prior art’s functioning, does not render the old composition patentably new to the discoverer." Atlas Powder Co. v. IRECO Inc., 190 F.3d 1342, 1347, 51 USPQ2d 1943, 1947 (Fed. Cir. 1999). Thus the claiming of a new use, new function or unknown property which is inherently present in the prior art does not necessarily make the claim patentable. In re Best, 562 F.2d 1252, 1254, 195 USPQ 430, 433 (CCPA 1977). Response to Arguments Applicant’s arguments with respect to the claim(s) have been considered but are moot because the new ground of rejection does not rely on any reference applied in the prior rejection of record for any teaching or matter specifically challenged in the argument. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to KRISHNAN S MENON whose telephone number is (571)272-1143. The examiner can normally be reached Flexible, but generally Monday-Friday: 8:00AM-4:30PM. 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, Prem C Singh can be reached at 571-272-6381. 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. /KRISHNAN S MENON/Primary Examiner, Art Unit 1777
Read full office action

Prosecution Timeline

May 19, 2023
Application Filed
Oct 10, 2025
Non-Final Rejection mailed — §103, §112
Jan 08, 2026
Response Filed
Jan 29, 2026
Final Rejection mailed — §103, §112
Mar 30, 2026
Response after Non-Final Action
Apr 28, 2026
Request for Continued Examination
Apr 29, 2026
Response after Non-Final Action
May 12, 2026
Non-Final Rejection mailed — §103, §112 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12673301
MULTILAYER POROUS MEMBRANE WITH INCOMPATIBLE RESINS
3y 8m to grant Granted Jul 07, 2026
Patent 12673300
COMPOSITE SEMIPERMEABLE MEMBRANE, AND SPIRAL MEMBRANE ELEMENT
2y 4m to grant Granted Jul 07, 2026
Patent 12673887
METHOD AND SYSTEM FOR PRE-TREATING HIGH STRENGTH WASTEWATER
2y 9m to grant Granted Jul 07, 2026
Patent 12663403
FILTER ASSEMBLIES, DEPTH INDICATORS, TORQUE-LIMITING FITTINGS, TORQUE-INDICATING FITTINGS, AND SYSTEMS INCORPORATING THE SAME
4y 3m to grant Granted Jun 23, 2026
Patent 12654139
METHOD FOR IMPROVING THE AIRTIGHTNESS OF BUILDINGS USING A BIOPOLYMER-BASED MEMBRANE
2y 11m to grant Granted Jun 16, 2026
Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

3-4
Expected OA Rounds
60%
Grant Probability
72%
With Interview (+11.8%)
3y 3m (~1m remaining)
Median Time to Grant
High
PTA Risk
Based on 1500 resolved cases by this examiner. Grant probability derived from career allowance rate.

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