ALEXANDRIA, Va., April 7 -- United States Patent no. 12,594,468, issued on April 7, was assigned to YONEX Co. LTD. (Tokyo).
"Grommet and racket" was invented by Masato Kawabata (Niigata, Japan), Hitoshi Kato (Niigata, Japan), Koji Nagasawa (Tokyo) and Nao Inoue (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "Structures with racket performance varied according to the configurations of cylindrical parts can be easily used. A grommet includes a cylindrical part which is mounted pierced through a through hole formed in a frame of a racket and through which a string passes. The string is extended in a tensioned state on the frame so as to form front and back faces as hitting faces. The cylindrical part incl...