ALEXANDRIA, Va., June 25 -- United States Patent no. 12,339,619, issued on June 24, was assigned to CANON K.K. (Tokyo).
"Toner" was invented by Yoshitaka Suzumura (Shizuoka, Japan), Dai Nozaki (Shizuoka, Japan) and Tomohiro Unno (Shizuoka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "The toner contains a toner particle having a core-shell structure including: a core containing a binder resin and a colorant; and a shell, wherein the toner contains a crystalline material, and the shell contains an amorphous thermoplastic resin; and when SP values of the crystalline material and the amorphous thermoplastic resin, which are calculated by the Fedors method, are defined as SPc (J/cm3)0.5 and SPa (J/cm3)0.5...