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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 12620675 B1

PDFFull Text
Date of Patent:
May. 05, 2026

Filed:

Mar. 03, 2023

Separator including mixed layer of heat-resistant resin and porous polyolefin film, and nonaqueous electrolyte secondary battery including the same

Applicant:

Sumitomo Chemical Company, Limited, Tokyo, JP;

Inventors:

Riku Matsumine, Niihama, JP;

Akihiko Shin, Niihama, JP;

Assignee:

SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo, JP;

Attorney:

Panitch Schwarze Belisario & Nadel LLP

Primary Examiner:

Sean P Cullen

Int. Cl.
CPC ...
H01M 50/451 (2021.01); H01M 50/417 (2021.01); H01M 50/423 (2021.01); H01M 50/434 (2021.01); H01M 50/446 (2021.01); H01M 50/489 (2021.01);
U.S. Cl.
CPC ...
H01M 50/451 (2021.01); H01M 50/417 (2021.01); H01M 50/423 (2021.01); H01M 50/434 (2021.01); H01M 50/446 (2021.01); H01M 50/489 (2021.01);
Abstract

As a nonaqueous electrolyte secondary battery separator which has excellent heat resistance and excellent battery performance, provided is a nonaqueous electrolyte secondary battery separator including a mixed layer which contains a heat-resistant resin and a porous base material that includes a polyolefin porous film, in the mixed layer, a weight ratio (W/W) between a weight Wof the heat-resistant resin and a weight Wof the porous base material being not less than 0.07.

Find Patent Forward Citations

Matsumine, Riku. (2026). Separator including mixed layer of heat-resistant resin and porous polyolefin film, and nonaqueous electrolyte secondary battery including the same (U.S. Patent No. 12620675). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/12620675

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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