ALEXANDRIA, Va., June 18 -- United States Patent no. 12,325,255, issued on June 10, was assigned to MITSUBISHI PENCIL COMPANY Ltd. (Tokyo).
"Writing instrument" was invented by Toshimi Kamitani (Tokyo), Chihiro Mochizuki (Tokyo) and Wataru Sagawa (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A writing instrument in which condensation does not occur in a cap even though the writing instrument is equipped with the cap and which has high writing instrument quality and commercial value. The writing instrument includes at least a barrel in which an aqueous ink is contained; a pen tip provided on a tip side of the barrel and capable of discharging the aqueous ink; and a cap that is removably attached on a ...