US Patent Issued to BRIDGESTONE SPORTS on March 31 for "Golf ball manufacturing method" (Japanese Inventor)

ALEXANDRIA, Va., March 31 -- United States Patent no. 12,589,526, issued on March 31, was assigned to BRIDGESTONE SPORTS Co. LTD. (Tokyo).

"Golf ball manufacturing method" was invented by Masaki Shiraishi (Sekishi, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for manufacturing a golf ball having a core and a cover of at least one layer includes the step of molding the cover layer with a vertically separating two-part injection mold which has a spherical cavity and three or more support pins disposed so as to be capable of advancing and retracting in a direction perpendicular to a mold parting line, each support pin being housing in a pin housing hole having a nitrided inner peripheral sidewa...