US Patent Issued to Canon on July 21 for "Process cartridge" (Japanese Inventors)

ALEXANDRIA, Va., July 21 -- United States Patent no. 12,687,799, issued on July 21, was assigned to Canon K.K. (Tokyo).

"Process cartridge" was invented by Masashi Uno (Shizuoka, Japan), Shohei Kototani (Shizuoka, Japan), Dai Nozaki (Shizuoka, Japan) and Kenji Ookubo (Shizuoka, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A process cartridge includes a toner and a developing roller. In the toner, a cohesion cluster containing fine silica particles and a binder component is present on surfaces of toner particles. Ratios of toner particles having the cohesion cluster before and after treatments with ultrasonic waves under specific conditions in terms of number % are within predetermined ranges. The dev...