ALEXANDRIA, Va., June 16 -- United States Patent no. 12,306,572, issued on May 20, was assigned to Canon K.K. (Tokyo).
"Process cartridge" was invented by Shintaro Kawaguchi (Kanagawa, Japan), Masamichi Sato (Shizuoka, Japan), Masatake Tanaka (Kanagawa, Japan) and Ryo Sugiyama (Shizuoka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A process cartridge includes a toner, a regulating member, and a developing roller including a conductive substrate, an elastic layer, and a surface layer which includes a binder resin, a first resin particle having an elastic coefficient of 100 to 10,000 MPa, and a second resin particle having an elastic coefficient of 2 to 50 MPa and in which the outer surface has a firs...