Multi-piece golf ball
AssigneeSumitomo Rubber Industries, Ltd.
InventorsKeiji Moriyama, Kazunari Yoshida
Life of this patent
Estimating the term…
Abstract
A golf ball retaining high coefficient of restitution inherent and having fine shot feeling with clubs such as drivers, irons and putters is disclosed. A multi-piece golf ball comprising; a center core having a JIS-C hardness of not more than 75, a cover having a JIS-C hardness of not less than 85, a core enclosing layer which directly enclose said center core having a JIS C hardness smaller than the others, and a r.d.preventing layer which prevents a restitution coefficient degradation being internally disposed in contact with said cover and having a JIS C hardness greater than the others.
Claims8
A multi-piece golf ball comprising:
- a center core having a JIS-C hardness of 55 to 65;
- a cover having a JIS-C hardness of 87 to 94;
- a core enclosing layer which directly encloses said center core and has a JIS-C hardness in the range of 30 to 45;
- and
- a r.d. preventing layer which prevents a restitution coefficient degradation, the r.d. preventing layer being internally disposed in direct contact with said cover and having a JIS-C hardness greater than the others and not less than 97,
- wherein the core enclosing layer has a JIS-C hardness lower than the JIS-C hardness of the center core, the cover, and the r.d. preventing layer.
A multi-piece golf ball comprising a center core, a core enclosing layer enclosing said center core, an inner cover layer covering said core enclosing layer, and an outer cover layer covering said inner cover layer, wherein
- said center core has a JIS-C hardness of from 55 to 65,
- said core enclosing layer has a JIS-C hardness of from 30 to 45,
- said inner cover layer has a JIS-C hardness of not less than 97, and
- said outer cover layer has a JIS-C hardness of from 87 to 94.
Dependencies are inferred from the claim text.