Prosecution Insights
Last updated: April 19, 2026
Application No. 18/615,877

MULTILAYERED ION EXCHANGE MEMBRANES

Non-Final OA §102§103
Filed
Mar 25, 2024
Examiner
WALLS, CYNTHIA KYUNG SOO
Art Unit
1751
Tech Center
1700 — Chemical & Materials Engineering
Assignee
USA Fortescue IP, INC.
OA Round
1 (Non-Final)
72%
Grant Probability
Favorable
1-2
OA Rounds
3y 3m
To Grant
72%
With Interview

Examiner Intelligence

Grants 72% — above average
72%
Career Allow Rate
649 granted / 904 resolved
+6.8% vs TC avg
Minimal -0% lift
Without
With
+-0.3%
Interview Lift
resolved cases with interview
Typical timeline
3y 3m
Avg Prosecution
55 currently pending
Career history
959
Total Applications
across all art units

Statute-Specific Performance

§101
0.1%
-39.9% vs TC avg
§103
53.3%
+13.3% vs TC avg
§102
18.9%
-21.1% vs TC avg
§112
22.9%
-17.1% vs TC avg
Black line = Tech Center average estimate • Based on career data from 904 resolved cases

Office Action

§102 §103
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 . Priority Acknowledgement has been made of applicant’s claim for priority under 35 USC 119 (e). Information Disclosure Statement The Information Disclosure Statement (IDS) filed 3/25/2024 has been placed in the application file and the information referred to therein has been considered. Drawings The drawings received 3/25/2024 are acceptable for examination purposes. Claim Rejections - 35 USC § 102 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 1, 4, 5, 12, 13, 17-20 are rejected under 35 U.S.C. 102(a1) as being anticipated by Bahar (US 2017/0198947). Bahar discloses all the elements of claims 1, 4, 5, 7, 12, 13, 17-20 [0035, 0049, 0051, 0056, 0094]. Hence, claims 1, 4, 5, 7, 12, 13, 17-20 are anticipated. 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. Claims 2, 3, 16 are rejected under 35 U.S.C. 103 as being unpatentable over Bahar (US 2017/0198947) as applied to claim 1, in view of Golben (US 4884953). Bahar discloses a heating device, but does not disclose the limitations of claims 2, 3, 16. Golben teaches a heat engine/pump powered by hot water heated preferably by solar energy (1:18). It would have been obvious to one of ordinary skilled in the art at the time the invention was made to use solar energy to heat Bahar’s heat pump, as taught by Golben, for the benefit of heating Bahar’s heat pump. Claims 6-11 are rejected under 35 U.S.C. 103 as being unpatentable over Bahar (US 2017/0198947) as applied to claim 1, in view of Bahar (US 2015/0241091). Bahar discloses a cationic exchange membrane [0042]. Bahar does not disclose the limitations of 6-11. Regarding claim 6, Bahar ‘091 teaches a cationic exchange membrane made of a perfluorosulfonic acid ionomer [0036]. Regarding claim 7, Bahar ‘091 teaches the ionomer is a supported ionomer having a support layer coupled thereto [0039]. Regarding claim 8, Bahar ‘091 teaches the support material is configured in the ionomer [0039]. Regarding claims 9-11, Bahar ‘091 teaches a fibrous medium such as fiberglass, ceramic fiber or polymer fiber can also be suitable. Additionally, the ionomer can be cast with fiber reinforcement in the solution such as fiber glass, or PTFE fiber, or polymeric fiber or ceramic fiber etc. In essence the idea is to reinforce the ionomer before assembly and/or during operation when solvated. Thinner membranes reduce the distance ions need to travel and as a result enhance performance. Reinforcing the membrane allows for ultra-thin membranes to be formed well below 25 microns in thickness or indeed 10 microns in thickness and ultimately less than one micron in thickness. It would have been obvious to one of ordinary skilled in the art the time the invention was made to the use the membrane of Bahar ‘091 as the membrane of Bahar for the benefit of forming a thin membrane in the electrochemical compressor of Bahar. Claim 14 is rejected under 35 U.S.C. 103 as being unpatentable over Bahar (US 2017/0198947) as applied to claim 1, in view of Gregory (US 3300341). Bahar does not disclose the body of water selected from the group consisting of: ocean, sea, river and lake. Gregory teaches a heat exchange system that uses a coolant from sea water, for example, when used in marine applications (2:65). It would have been obvious to one of ordinary skilled in the art the time the invention was made to the use coolant water of Bahar from the sea, as taught by Gregory, when the application of Bahar is used in a marine application. Claim 15 is rejected under 35 U.S.C. 103 as being unpatentable over Bahar (US 2017/0198947) as applied to claim 1, in view of Johnson (US 2012/0064419). Bahar does not disclose further comprising a battery and wherein the electricity produced by the electrochemical-expander is stored in said battery. Johnson teaches a heat engine, in which useful electrical energy generated by the engine is stored within a battery [0040]. It would have been obvious to one of ordinary skilled in the art the time the invention was made to store the electrical energy generated by Bahar in a battery, as taught by Johnson, for the benefit of storing the energy for future use. Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to CYNTHIA KYUNG SOO WALLS whose telephone number is (571)272-8699. The examiner can normally be reached on M-F until 5pm. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, Jonathan Leong can be reached at 571-270-1292. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of an application may be obtained from the Patent Application Information Retrieval (PAIR) system. Status information for published applications may be obtained from either Private PAIR or Public PAIR. Status information for unpublished applications is available through Private PAIR only. For more information about the PAIR system, see http://pair-direct.uspto.gov. Should you have questions on access to the Private PAIR system, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). If you would like assistance from a USPTO Customer Service Representative or access to the automated information system, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. /CYNTHIA K WALLS/ Primary Examiner, Art Unit 1751
Read full office action

Prosecution Timeline

Mar 25, 2024
Application Filed
Oct 08, 2025
Non-Final Rejection — §102, §103 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12586779
COMPOSITE ANODE ACTIVE MATERIAL AND ANODE AND LITHIUM SECONDARY BATTERY INCLUDING THE SAME
2y 5m to grant Granted Mar 24, 2026
Patent 12562400
AQUEOUS HYDROGEL ELECTROLYTE SYSTEMS WITH WIDE ELECTROCHEMICAL STABILITY WINDOW
2y 5m to grant Granted Feb 24, 2026
Patent 12555783
NEGATIVE ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY
2y 5m to grant Granted Feb 17, 2026
Patent 12548792
NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY
2y 5m to grant Granted Feb 10, 2026
Patent 12548854
LITHIUM SECONDARY BATTERY INCLUDING Si-BASED ANODE ACTIVE MATERIAL
2y 5m to grant Granted Feb 10, 2026
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
72%
Grant Probability
72%
With Interview (-0.3%)
3y 3m
Median Time to Grant
Low
PTA Risk
Based on 904 resolved cases by this examiner. Grant probability derived from career allow rate.

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