ALEXANDRIA, Va., Nov. 3 -- United States Patent no. 12,781,752, issued on Nov. 3, was assigned to SHIMADZU Corp. (Kyoto, Japan).
"Vacuum pump" was invented by Masahito Kogame (Kyoto, Japan) and Hiroaki Kimura (Kyoto, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A vacuum pump includes a housing having a suction port, a rotor housed in the housing and rotationally driven to suck gas through the suction port and pump the gas, and a lid member that covers a recess of the rotor. The lid member has a cone shape having a vertex on a side close to the suction port and having a bottom on a side close to the rotor. The generatrix of the cone shape includes a first curved portion having such a curve that an ang...