Prosecution Insights
Last updated: April 19, 2026
Application No. 18/031,857

STABILIZED ELECTROLYTES FOR LOW-TEMPERATURE BATTERIES

Final Rejection §102§112
Filed
Apr 13, 2023
Examiner
BARCENA, CARLOS
Art Unit
1723
Tech Center
1700 — Chemical & Materials Engineering
Assignee
The Regents of the University of California
OA Round
2 (Final)
80%
Grant Probability
Favorable
3-4
OA Rounds
2y 10m
To Grant
93%
With Interview

Examiner Intelligence

Grants 80% — above average
80%
Career Allow Rate
883 granted / 1101 resolved
+15.2% vs TC avg
Moderate +12% lift
Without
With
+12.5%
Interview Lift
resolved cases with interview
Typical timeline
2y 10m
Avg Prosecution
38 currently pending
Career history
1139
Total Applications
across all art units

Statute-Specific Performance

§101
0.5%
-39.5% vs TC avg
§103
44.4%
+4.4% vs TC avg
§102
27.4%
-12.6% vs TC avg
§112
19.7%
-20.3% vs TC avg
Black line = Tech Center average estimate • Based on career data from 1101 resolved cases

Office Action

§102 §112
DETAILED ACTION 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. Claim 1-3, 6, 9, 11, 14, and 17 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 term “low melting point” in claims 1 and 9 is a relative term which renders the claim indefinite. The term “low melting point” 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. The claim would need to recite a temperature. The term “high electrochemical stability” in claim 1 is a relative term which renders the claim indefinite. The term “high electrochemical stability” 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. The claim would need to recite a voltage. 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 1-3, 5, 6, 9-14, 17-23, 25-28, 30-34, and 37 are rejected under 35 U.S.C. 102(a)(1) as being anticipated by Chiga et al. (US 2007/0287071). Regarding claims 1-3, 5, 11-13, 19-22, and 31-33, Chiga discloses nonaqueous electrolyte solution for secondary battery comprising: an electrolyte with a lithium salt (abstract); and FEC and methyl propionate (MP) in a volume ratio of 10:90, 20:80, and 30:70 (para 0083: Examples A15-A17). Regarding claims 6, 9, 14, 17, 23, 25, 28, and 34, Chiga discloses graphite as the negative electrode (para 0052) and lithium cobalt oxide as the positive electrode (para 0051). Regarding claim 10, 18, 26, 27, 30, and 37, Chiga discloses 1 mole/L LiPF6 (para 0053). Conclusion Any inquiry concerning this communication or earlier communications from the examiner should be directed to CARLOS BARCENA whose telephone number is (571)270-5780. The examiner can normally be reached Monday-Thursday 8-5 pm. 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, Milton I Cano can be reached at (313)446-4937. 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. /CARLOS BARCENA/Primary Examiner, Art Unit 1723
Read full office action

Prosecution Timeline

Apr 13, 2023
Application Filed
Oct 27, 2025
Non-Final Rejection — §102, §112
Mar 30, 2026
Response Filed
Apr 11, 2026
Final Rejection — §102, §112 (current)

Precedent Cases

Applications granted by this same examiner with similar technology

Patent 12603319
SELF-CHARGING ELECTROCHEMICAL CELLS
2y 5m to grant Granted Apr 14, 2026
Patent 12597607
CATHODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY INCLUDING THE SAME
2y 5m to grant Granted Apr 07, 2026
Patent 12592384
POSITIVE ELECTRODE ACTIVE MATERIAL AND PREPARATION METHOD THEREFOR, POSITIVE ELECTRODE, AND LITHIUM ION SECONDARY BATTERY
2y 5m to grant Granted Mar 31, 2026
Patent 12583759
ALKALI METAL-DOPED AND ALKALINE EARTH METAL-DOPED POSITIVE ELECTRODE MATERIALS AND METHODS OF MANUFACTURING THE SAME
2y 5m to grant Granted Mar 24, 2026
Patent 12586794
Positive Electrode for Lithium Secondary Battery Including Insulating Layer Having Excellent Wet Adhesion and Lithium Secondary Battery Including the Same
2y 5m to grant Granted Mar 24, 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
80%
Grant Probability
93%
With Interview (+12.5%)
2y 10m
Median Time to Grant
Moderate
PTA Risk
Based on 1101 resolved cases by this examiner. Grant probability derived from career allow rate.

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