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.:
Date of Patent:
Nov. 04, 2025
Filed:
Nov. 06, 2024
Sumitomo Riko Company Limited, Aichi, JP;
Shinkichi Kashihara, Aichi, JP;
Junichiro Suenaga, Aichi, JP;
Akitoshi Morita, Aichi, JP;
Takeru Horiuchi, Aichi, JP;
Sumitomo Riko Company Limited, Aichi, JP;
Abstract
Provided is a charging roll for electrophotographic equipment with which any increase in resistance and any bleeding of ionic electroconductive agent while energization persists can be minimized. A charging rollfor electrophotographic equipment, the charging rollcomprising a shaft bodyand an elastic layerthat is formed on the outer peripheral surface of the shaft body, the elastic layerbeing a crosslinked article of a rubber composition containing the following components (a) to (e). (a) One or more selected from hydrin rubber and nitrile rubber, (b) a crosslinking agent, (c) an ionic electroconductive agent, (d) one or more selected from piperidinyloxy radical compounds and phenolic antioxidants, and (e) one or more selected from salts of cyclic amidine compounds and thiophthalimide compounds.