ALEXANDRIA, Va., March 17 -- United States Patent no. 12,577,418, issued on March 17, was assigned to MITSUBISHI PENCIL COMPANY Ltd. (Shinagawa-ku, Japan).
"Ink composition for water-based ballpoint pens" was invented by Kosuke Ogura (Shinagawa-ku, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An ink composition for a water-based ballpoint pen in which, even in a case of an ink composition for a water-based ballpoint pen using a colored resin particle containing a pigment, the phenomenon of skipped strokes does not occur and writing defects are less likely to occur when writing at a high writing angle or under a high load. An example of the ink composition for a water-based ballpoint pen according to ...