US Patent Issued to CANON on March 18 for "Toner" (Japanese Inventors)

ALEXANDRIA, Va., March 19 -- United States Patent no. 12,253,824, issued on March 18, was assigned to CANON K.K. (Tokyo).

"Toner" was invented by Kenichi Nakayama (Shizuoka, Japan), Naoya Isono (Shizuoka, Japan), Yoshiaki Shiotari (Shizuoka, Japan) and Hirofumi Kyuushima (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A toner comprising a toner particle and a silica particle on a surface of the toner particle, wherein an area formed by a polyester resin and an area formed by a styrene-acrylic resin are present on the surface of the toner particle; the silica particle has the number-average particle diameter of 15 to 60 nm; the silica particle has the average pore diameter of 5.0 to 20.0 nm; and the sil...