Michael Robert Keener

US Patent:

50298640, Jul 9, 1991

Filed:

Jun 11, 1990

Appl. No.:

7/535574

Inventors:

Michael B. Keener - Houston TX

International Classification:

A63B 5304

US Classification:

273175

Abstract:

A planar club face is set forth which has multiple parallel straight line grooves formed in the planar face. While the grooves are V-shaped when viewed at right angles, the V is set at an angle so that it defines within the groove a normal face and a contact face. Both of the groove faces are full length along the groove, and the several grooves span most of the planar club face. The normal face does not contact the ball while the golf ball is contacted by the face. The contact face changes the grip of the club face with the ball at the instant of impact so that improved backspin control is achieved. The contact face has a greater surface area than the normal face.