Golf ball

• US 4,787,638 A
• Filed: 01/30/1987
• Issued: 11/29/1988
• Est. Priority Date: 01/31/1986
• Status: Expired due to Fees

• Current Assignee: Maruman Golf Co., Ltd.
• Original Assignee: Maruman Golf Co., Ltd.
• Inventors: Kobayashi, Masashi
• Primary Examiner(s): Marlo, George J.
• Application Number:
  US07/008,888
• Time in Patent Office: 669 Days
• Field of Search: 273/232, 273/235 A, 273/213, 273/183 C, 273/235 R, 273/235 B, 40/327
• US Class Current: 473/383
• CPC Class Codes: A63B 37/0004 Surface depressions or protrusions
• CPC Class Codes: A63B 37/0012 Dimple profile, i.e. cross-sectional view
• CPC Class Codes: A63B 37/0089 Coefficient of drag

Abstract

A golf ball comprises a body having a spherical outer surface and a plurality of first dimples arranged substantially uniformly in the spherical outer surface thereof. The body also has a plurality of indentations which are smaller than the first dimples and arranged substantially uniformly in the spherical outer surface and the inside surface of the first dimples. The indentations may be formed by grit blasting.

Claims

1. A golf ball, comprising:

a body having a generally spherical outer surface;

a plurality of dimples disposed substantially uniformly on said spherical outer surface; and

a plurality of indentations, smaller than said dimples, formed in each dimple and on the spherical outer surface.

2. The golf ball of claim 1, wherein said indentations in said dimples and on said spherical outer surface have structural characteristics corresponding to indentations formed by grit blasting.

3. The golf ball of claim 1, wherein each of said dimples has a hemispherical wall.

4. The golf ball of claim 3, wherein each of said indentations has a hemispherical wall.

5. The golf ball of claim 1, wherein each of said indentations has a hemispherical wall.

6. The golf ball of claim 1, wherein the parameters of said indentations are such that said indentations actively generate small vortices of air on each dimple and on said spherical outer surface during flight of the ball.