ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,474,649, issued on Nov. 18, was assigned to CANON K.K. (Tokyo).
"Toner and method for producing toner" was invented by Shohei Tsuda (Shizuoka, Japan), Taiji Katsura (Shizuoka, Japan) and Shintaro Kawaguchi (Kanagawa, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A toner comprising: a toner particle comprising a binder resin and boric acid; and an external additive A having a primary particle major diameter of 80 to 200 nm, wherein in ATR-IR analysis of the toner particle in an ATR method using germanium as an ATR crystal, a peak corresponding to boric acid is detected, the average value of a shape factor SF-1 of the external additive A is 105 to ...