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:
Jul. 09, 2019
Filed:
May. 31, 2018
Sumitomo Rubber Industries, Ltd., Kobe-shi, Hyogo, JP;
Kazuki Nojiri, Kobe, JP;
SUMITOMO RUBBER INDUSTRIES, LTD., Kobe-Shi, Hyogo, JP;
Abstract
An inventive developing roller () includes a roller body () which includes an inner layer () having a porous structure and an outer layer () of a seamless nonporous tube. The porous structure of the inner layer () is formed from a semiconductive rubber composition containing ethylene propylene rubber, paraffin oil and carbon black having a DBP oil absorption amount of not less than 400 cm/100 g. The nonporous tube for the outer layer () contains a polyurethane thermoplastic elastomer having a type-A durometer hardness of not higher than 93, carbon black and crosslinked PMMA particles having a median particle diameter of 5 μm to 20 μm.