ALEXANDRIA, Va., April 21 -- United States Patent no. 12,606,715, issued on April 21, 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 for writing instruments may contain colored resin particles encapsulating a pigment, wherein the ink is not repelled when the aqueous ink composition for writing instruments is used to write on a paper face attached with hand fingers or the like, and achieves a uniform density in a drawn line and excellent writing capability. An embodiment of the aqueous ink composition for writing in...