ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,442,450, issued on Oct. 14, was assigned to EAGLEBURGMANN JAPAN Co. LTD. (Tokyo).
"Shaft sealing device" was invented by Ryo Nakamura (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A shaft sealing device sealing a sealed fluid includes a mating ring having a sliding surface and attached to a casing into which a rotating shaft is inserted, a commonly used seal ring having a sliding surface that slides against the sliding surface of the mating ring, and attached to the rotating shaft, and the sliding surfaces, and a backup seal ring attached to the rotating shaft on a counter-sealed fluid side in an axial direction with respect to the sliding surfa...