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:
Mar. 08, 2022
Filed:
Sep. 18, 2020
Bridgestone Corporation, Tokyo, JP;
Yusuke Fujisawa, Tokyo, JP;
Sotaro Yamashita, Tokyo, JP;
BRIDGESTONE CORPORATION, Tokyo, JP;
Abstract
Provided are a developing roller which includes a shaft, and a base layer and a surface layer sequentially formed on an outer peripheral portion of the shaft in a radial direction, where 1) a low-resilience layer is disposed between the base layer and the surface layer, 2) the low-resilience layer has a loss tangent tan δ value that is larger than a loss tangent tan δ value of any of the base layer and the surface layer when measured under conditions of a temperature of 23° C., an amplitude of ±20 μm, and a frequency of 6 Hz, and 3) the developing roller has an Asker C hardness and thickness value of 500 or less, which is defined by the following formula (1):Askerhardness and thickness value of the developing roller=Askerhardness of the developing roller×(thickness of the developing roller+6)  (1).