ALEXANDRIA, Va., March 19 -- United States Patent no. 12,253,094, issued on March 18, was assigned to NIDEC INSTRUMENTS Corp. (Nagano, Japan).
"Pump device" was invented by Takehiko Yazawa (Nagano, Japan) and Michiaki Takizawa (Nagano, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An impeller of a pump device includes a vane wheel fixed to a flange portion of a rotor member. The vane wheel includes a plurality of vane portions protruding from a disc portion opposed to the flange portion in an axial direction. At a tip end of each vane portion, a rib that is inserted into a fixing groove provided in the flange portion is provided. A gap in the axial direction is provided between a tip end of an inner p...