ALEXANDRIA, Va., April 15 -- United States Patent no. 12,601,380, issued on April 14, was assigned to HITACHI ASTEMO LTD. (Hitachinaka, Japan).
"Propeller shaft" was invented by Shoichi Ichikawa (Hitachinaka, Japan), Daiki Tsutsumi (Hitachinaka, Japan), Toshiyuki Masuda (Hitachinaka, Japan) and Kenichiro Ishikura (Hitachinaka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A water-impermeable cover is provided with an opening part extending so as to approach an opening part of a holding ring of a propeller shaft. The water-impermeable cover is provided at a position on the opening-part side of the holding ring. The water-impermeable cover is fixed in a position on the opening-part side of the holding r...