Two-piece golf ball

Details Two-piece golf ball Two-piece golf ball

Filed on

1994-12-28

Date issued

1997-07-08

Examiner

Marlo, George J.

Patent Class

Games using tangible projectile

SubClass

Golf

SubSubClass

Ball

Other Related Categories

473377, 473351, A63B 3706

Type

Patent

Status

active

Patent number

056454961

Description

ABSTRACT:
A two-piece golf ball which consists essentially of a core and a cover covering the core, wherein said core is made of a rubber composition comprising 100 parts by weight of a base rubber, 20 to 45 parts by weight of a co-crosslinking agent and 0.3 to 5.0 parts by weight of an organic peroxide, a hardness of the core is within a range of 40 to 56 in the vicinity of its center and 70 to 95 in the vicinity of its surface; a difference between a hardness in the vicinity of the surface and that in the vicinity of the center is within a range of 20 to 40; and a compression deformation amount formed between initial loading 10 kg and final loading 130 kg is 3.1 to 4.5 mm; said hardness being measured by means of JIS-C type hardness tester.

REFERENCES:
patent: 4714253 (1987-12-01), Nakahara et al.
patent: 4781383 (1988-11-01), Kamada et al.
patent: 4858924 (1989-08-01), Saito et al.
patent: 4919434 (1990-04-01), Saito
patent: 5304608 (1994-04-01), Yabuki et al.

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