US 7,473,192 B2
	Multi-piece solid golf ball
Shinya Makino, Chichibu (Japan); and Hideo Watanabe, Chichibu (Japan)
Assigned to Bridgestone Sports Co., Ltd., Tokyo (Japan)
Filed on Dec. 10, 2007, as Appl. No. 11/953,395.
Application 11/953395 is a continuation in part of application No. 11/443075, filed on May 31, 2006, granted, now 7,377,864.
Prior Publication US 2008/0125248 A1, May 29, 2008
This patent is subject to a terminal disclaimer.
Int. Cl. A63B 37/06 (2006.01)

U.S. Cl. 473—373

14 Claims

1. A multi-piece golf ball comprising a core, an intermediate layer enclosing the core, and a cover layer which encloses the intermediate layer and has on an outside surface thereof a plurality of dimples, wherein the cover layer is harder than the intermediate layer; letting A be the thickness of the intermediate layer, B be the thickness of the cover layer and C be the diameter of the core, 65≧C/A≧31 and 65≧C/B≧30; a specific gravity of the core ranges from 1.0 to 1.2, a specific gravity of the intermediate layer ranges from 0.88 to 1.00, and the ball has an initial velocity, as measured by a method set forth in the Rules of Golf using an initial velocity measuring apparatus of the same type as the USGA drum rotation-type initial velocity instrument, of at least 77.0 m/s.