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:
Aug. 27, 2019
Filed:
Jan. 14, 2019
Applicant:
Sumitomo Riko Company Limited, Aichi, JP;
Inventors:
Assignee:
Sumitomo Riko Company Limited, Aichi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03G 15/08 (2006.01); C08L 27/18 (2006.01); C08L 19/02 (2006.01); G03G 15/02 (2006.01);
U.S. Cl.
CPC ...
G03G 15/0808 (2013.01); C08L 19/02 (2013.01); C08L 27/18 (2013.01); G03G 15/0233 (2013.01); G03G 15/0818 (2013.01);
Abstract
Provided is a developing roll (R) with which it is possible to suppress toner stress in a low-temperature and low-humidity environment. A developing roll (R) for an electrophotographic device has a surface layer (). In a surface hardness histogram () of the surface layer () measured by using an atomic force microscope (AFM), the surface hardness (H) at the top peak (P) is in the range of 10-55 MPa, and the area ratio (S) of the histogram portion corresponding to a surface hardness of 45 MPa or below in relation to the entire histogram is 65% or above.