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. 02, 2021
Filed:
Apr. 15, 2019
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventors:
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03G 15/08 (2006.01);
U.S. Cl.
CPC ...
G03G 15/0815 (2013.01); G03G 15/0808 (2013.01);
Abstract
The developing roller includes an electro-conductive substrate and a covering layer on the electro-conductive substrate, the covering layer including a matrix and an electro-conductive particle dispersed in the matrix, an arithmetic mean value of the current value is 300 pA or less and the standard deviation of the current value is 0.1-fold or less of the current value, a standard deviation of a potential is 3.0 V or more, and an arithmetic mean value of a volume resistivity is 10Ω·cm or less, and a standard deviation of the volume resistivity is 1-fold or more of the arithmetic mean value of the volume resistivity.