ALEXANDRIA, Va., Nov. 11 -- United States Patent no. 12,466,967, issued on Nov. 11, was assigned to MITSUBISHI PENCIL COMPANY Ltd. (Shinagawa-ku, Japan).
"Aqueous ink composition for writing instruments" 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 writing instruments may achieve excellent color development and excellent darkness of a drawn line, while colored resin particles encapsulating a pigment are used. An embodiment of the aqueous ink composition for writing instruments includes an aqueous ink composition for writing instruments containing at least colored resin particles (A) having a pigment (p) encapsulated i...