ALEXANDRIA, Va., Feb. 26 -- United States Patent no. 12,234,828, issued on Feb. 25, was assigned to Edwards Japan Ltd. (Chiba, Japan).
"Vacuum pump and vacuum pump rotor blade" was invented by Takashi Kabasawa (Chiba, Japan) and Kengo Saegusa (Chiba, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A vacuum pump and a vacuum pump rotor blade that can effectively limit deposition of reaction products are provided. The vacuum pump includes a rotating shaft held rotationally, a drive mechanism for the rotating shaft, a first rotor blade made of a first material, a second rotor blade made of a second material having higher heat resistance than the first material, and disposed further toward a downstream side...