03997170 is referenced by 211 patents and cites 14 patents.

A golf club of the wood, or iron, type, as categorized by the U.S. Golf Association, has a head with an intact, flat, planar ball striking face but with a plurality of parallel grooves formed in the upper (or top) face, normal to the striking face to visually indicate the desired direction of stroke. A plurality of parallel grooves are also formed in the lower (or bottom) face, normal to the striking face to reduce air and ground friction. The grooves commence at closed ends, just in rear of the upper and lower front edges, so as not to affect the striking face. The grooves and ribs are below the level of their respective upper or lower faces, opposite each other in equal numbers and cooperate to reduce resistance while having a rudder effect.

Title
Golf wood, or iron, club
Application Number
5/606081
Publication Number
3997170
Application Date
August 20, 1975
Publication Date
December 14, 1976
Inventor
Marvin B Goldberg
7 Oak Park Circle, Lexington, 02173
MA, US
Agent
Pearson & Pearson
IPC
A63B 53/04
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