ALEXANDRIA, Va., March 17 -- United States Patent no. 12,577,956, issued on March 17, was assigned to NIDEC INSTRUMENTS Corp. (Nagano, Japan).
"Pump device" was invented by Naoya Isaji (Nagano, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A pump device includes a motor having a rotor and a stator, and an impeller which is disposed in a pump chamber and is integrally rotated with the rotor. The rotor includes a rotor member having a first cylindrical part and a drive magnet surrounding the first cylindrical part. A radial bearing is held on an inner side of the first cylindrical part. The drive magnet has a second cylindrical part surrounding an outer periphery of the first cylindrical part and a ring...