ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,547,090, issued on Feb. 10, was assigned to CANON K.K. (Tokyo).
"Toner" was invented by Kouichirou Ochi (Chiba, Japan), Masayuki Hama (Ibaraki, Japan), Hayato Ida (Ibaraki, Japan), Yuya Chimoto (Chiba, Japan) and Hisasuke Kajihara (Ibaraki, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A toner comprising a toner particle comprising a colorant, a binder resin, and calcium carbonate particles, wherein an amount of the colorant in the toner particle is from 1.0 to 20.0% by mass; the binder resin comprises a polyester resin; the polyester resin has an aromatic ring concentration of from 50 to 70 mol %; a surface of the calcium carbonate particles is ...