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:
Apr. 21, 2025
Filed:
Dec. 02, 2021
Nok Corporation, Tokyo, JP;
Kosuke Oura, Kanagawa, JP;
Norimasa Hosonuma, Kanagawa, JP;
Atsushi Ikeda, Kanagawa, JP;
Yu Akai, Kanagawa, JP;
Satoshi Fukuoka, Kanagawa, JP;
Kenji Sasaki, Kanagawa, JP;
NOK CORPORATION, Tokyo, JP;
Abstract
A developing roll for use in an image-forming apparatus using electrophotography includes a cylindrical core made of metal; an annular elastic layer made of rubber and arranged around the core; and an annular surface layer arranged around the elastic layer. The surface layer includes a central portion and end portions. The central portion is located at the center of the developing roll in the longitudinal direction, the end portions are located at opposite end portions of the developing roll in the longitudinal direction. A coefficient of kinetic friction of the outer peripheral surface of each end portion of the surface layer is less than or equal to 0.1, and a ten-point average roughness Rof the outer peripheral surface of each end portion of the surface layer is less than or equal to 1.8 μm.