ALEXANDRIA, Va., March 12 -- United States Patent no. 12,247,575, issued on March 11, was assigned to NIKKISO Co. LTD. (Tokyo).
"Sealing member and submerged pump system" was invented by Yasuo Tomita (Tokyo), Motoyasu Ogawa (Tokyo) and Masaaki Eguchi (Saitama, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A sealing member according to the present invention includes a head plate having a through hole and attached to an opening end of a pump column, a lift shaft penetrating the through hole and raised and lowered between a raised position and a lowered position in raising and lowering the pump, and a bellows member extending and contracting corresponding to the raising and lowering of the lift shaft. Th...