ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,449,053, issued on Oct. 21, was assigned to NIKKISO Co. LTD. (Tokyo).
"Foot valve assembly 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 foot valve assembly according to the present invention includes: a cylindrical adapter attached to a lower opening end of a cylindrical pump column configured to accommodate a pump configured to be submerged in a handling liquid, the adapter configured to accommodate a suction port of the pump; a disc-shaped valve disc configured to open and close a lower opening of the adapter corresponding to ...