ALEXANDRIA, Va., March 26 -- United States Patent no. 12,257,845, issued on March 25, was assigned to KYOCERA DOCUMENT SOLUTIONS INC. (Osaka, Japan).

"Ink replacement method in ink-jet recording apparatus" was invented by Noriaki Furukawa (Osaka, Japan), Shunsuke Yamasaki (Osaka, Japan) and Kaori Kitayama (Osaka, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "According to an ink replacement method in an ink-jet recording apparatus that includes a recording head having an ink ejection face in which a plurality of nozzles for ejecting ink onto a recording medium are arranged, a sub-tank that temporarily stores the ink fed from an ink container, and an ink flow passage through which the ink circulates fro...