ALEXANDRIA, Va., Sept. 17 -- United States Patent no. 12,416,360, issued on Sept. 16, was assigned to PILLAR Corp. (Osaka, Japan).
"Mechanical seal device" was invented by Masaya Nakatsuka (Osaka, Japan), Masashi Hayashi (Osaka, Japan) and Shigeyuki Fujinaga (Osaka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A circulation pump mechanism of a mechanical seal device includes a rotor having mounting grooves formed therein, vanes provided in the mounting grooves, a plurality of biasing members provided in a space on a deep side with respect to the vane in each mounting groove and configured to bias each vane in a direction in which the vane is caused to project, a housing having an inner circumferentia...