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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 12761577 B1

PDFFull Text
Date of Patent:
Oct. 13, 2026

Filed:

Jul. 07, 2025

Charging roll for electrophotographic apparatuses

Applicant:

Sumitomo Riko Company Limited, Aichi, JP;

Inventors:

Yoshihiro Saito, Aichi, JP;

Akitoshi Morita, Aichi, JP;

Takeru Horiuchi, Aichi, JP;

Assignee:

Sumitomo Riko Company Limited, Aichi, JP;

Attorney:

JCIPRNET

Primary Examiner:

Sophia S Chen

Int. Cl.
CPC ...
G03G 15/02 (2006.01); C08J 7/04 (2020.01); C08K 3/04 (2006.01); C08L 7/00 (2006.01); C08L 9/00 (2006.01); C09D 127/16 (2006.01); C09D 127/18 (2006.01);
U.S. Cl.
CPC ...
G03G 15/0233 (2013.01); C08J 7/0427 (2020.01); C08K 3/04 (2013.01); C08L 7/00 (2013.01); C08L 9/00 (2013.01); C09D 127/16 (2013.01); C09D 127/18 (2013.01); C08J 2307/00 (2013.01); C08J 2309/00 (2013.01); C08J 2427/16 (2013.01); C08J 2427/18 (2013.01); C08J 2433/12 (2013.01); C08J 2435/04 (2013.01); C08K 2201/011 (2013.01); G03G 2215/025 (2013.01);
Abstract

A charging roll for electrophotographic apparatuses includes: a shaft body, an elastic body layer formed on an outer circumferential surface of the shaft body, and a surface layer formed on an outer circumferential surface of the elastic body layer. The elastic body layer contains a non-polar rubber, a polar rubber, and a carbon black, and has a relative permittivity of 7 or more and 29 or less and a resistance value of 6.0×10Ω or more and 5.0×10Ω or less. The surface layer contains a fluororesin and a (meth)acrylic resin, and has a relative permittivity of 10 or more and 22 or less and a resistance value of 1.2×10Ω or more and 8.8×10Ω or less.

Find Patent Forward Citations

Saito, Yoshihiro. (2026). Charging roll for electrophotographic apparatuses (U.S. Patent No. 12761577). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/12761577

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

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