ALEXANDRIA, Va., Aug. 12 -- United States Patent no. 12,386,280, issued on Aug. 12, was assigned to CANON K.K. (Tokyo).

"Toner" was invented by Hisasuke Kajihara (Ibaraki, Japan), Yuya Chimoto (Chiba, Japan), Hayato Ida (Ibaraki, Japan), Kouichirou Ochi (Chiba, Japan), Kazuhisa Shirayama (Tokyo) and Masayuki Hama (Ibaraki, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A toner having high rub resistance is provided. A toner including a toner particle containing a binder resin and a calcium carbonate particle, wherein in X-ray diffractometry of the toner particle by CuKAlpha radiation, when the Bragg angle is defined as Theta, (i) the calcium carbonate particle has peaks at 2Theta of 26.5degplus-minus0....