ALEXANDRIA, Va., July 21 -- United States Patent no. 12,685,910, issued on July 21, was assigned to SUMITOMO RUBBER INDUSTRIES LTD. (Hyogo, Japan).
"Golf club and weight piece for golf club" was invented by Kota Maeda (Hyogo, Japan), Hiroshi Hasegawa (Hyogo, Japan) and Akihiko Kobayashi (Hyogo, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A golf club includes a club shaft having a first end, a second end, and an inner peripheral surface defining an inner space of the club shaft, and a weight piece installed on a first end side of the club shaft. The weight piece includes an insertion portion located in the inner space, and an engagement portion located outside the club shaft to engage the first end. ...