ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,473,445, issued on Nov. 18, was assigned to MITSUBISHI PENCIL COMPANY Ltd. (Shinagawa-ku, Japan).
"Ink composition for aqueous ballpoint pens" was invented by Kosuke Ogura (Shinagawa-ku, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An aqueous ink composition suitable for ballpoint pens may achieve excellent smooth writing without causing deterioration of the smooth writing and wear of a tip socket while colored resin particles encapsulating a pigment are used. An embodiment of such ink compositions is an aqueous ink composition suitable for ballpoint pens containing at least colored resin particles (A) encapsulating a pigment (a) and non-colored...