ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,553,429, issued on Feb. 17, was assigned to Nippon Pillar Packing Co. Ltd. (Osaka, Japan).
"Bellows pump device" was invented by Daisuke Urata (Osaka, Japan), Kazukiyo Teshima (Osaka, Japan) and Atsufumi Kinoshita (Osaka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A control unit 6 of a bellows pump device 1 determines whether or not a second bellows 14 (first bellows 13) is in a predetermined expanded state when the first bellows 13 (second bellows 14) contracts to a mid-contraction state, on the basis of respective detection signals of a first detection unit 29 and a second detection unit 31, and when a determination result of the determinati...