US5304608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two piece golf ball
Assignee: Dunlop Sports Co Ltd
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Filing: 1992-10-30
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Granted: 1994-04-19
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Expires: 2012-10-30
Abstract
Abstract The present invention provides a two piece golf ball having excellent hit feeling, which comprises a core and a cover, wherein the core has a deformation (compression deformation) of 3.7 to 4.5 mm caused by applying from 10 kg of an initial load to 130 kg of a final load, and is prepared from a rubber composition comprising 100 parts by weight of a cis-1,4-polybutadiene rubber and 20 to 30% by weight of a metal salt of an unsaturated carboxylic acid, and wherein the cover has a stiffness modulus of 3,700 to 4,500 kg/cm 2 and a thickness of 2.2 to 2.9 mm.
Inventors
- 👤 Yoshikazu Yabuki
- 👤 Seiichiro Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:53
CPC Classifications
A; A63; A63B; A63B37/00; A63B37/0003; A63B37/005; A63B37/006; A63B37/0062; A63B37/00621; A63B37/00622; C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098; A63B37/0023; A63B37/0029; A63B37/0033; A63B37/0051; A63B37/0054; A63B37/0065
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
97 words
A two piece golf ball comprising a core and a cover, wherein the core has a compression deformation of 3.7 to 4.5 mm caused by applying from 10 kg of an initial load to 130 kg of a final load, wherein the core is prepared from a rubber composition comprising 100 parts by weight of a cis-1,4-polybutadiene rubber and 20 to 30% by weight of a Group IIA or IIB metal salt of (meth)acrylic acid, and wherein the cover has a stiffness modulus of 3,700 to 4,500 kg/cm 2 and a thickness of 2.2 to 2.9 mm.
Claim 2
Dependent Claim
97 words
A two piece golf ball comprising a core and a cover, wherein the core has a compression deformation of 3.7 to 4.5 mm caused by applying from 10 kg of an initial load to 130 kg of a final load, wherein the core is prepared from a rubber composition comprising 100 parts by weight of a cis-1,4-polybutadiene rubber and 20 to 30% by weight of a Group IIA or IIB metal salt of (meth)acrylic acid, and wherein the cover has a stiffness modulus of 3,700 to 4,500 kg/cm 2 and a thickness of 2.2 to 2.9 mm.
Claim 3
Dependent Claim
51 words
The golf ball according to claim 1 wherein said core is formed from a rubber composition comprising 100 parts by weight of a high cispolybutadiene rubber having a cis-1,4 structure of at least 40% and 20 to 30% by weight of a Group IIA or IIB metal salt of (meth)acrylic acid.
Claim 4
Dependent Claim
17 words
The golf ball according to claim 2 wherein said rubber composition further comprises organic peroxides or fillers.
Claim 5
Dependent Claim
48 words
The golf ball according to claim 1 wherein the hardness (JIS-C) of the core satisfies the following conditions: Center: 56 to 58 5 to 10 mm away from the center: 68 to 73 (deviation ±3%) 15 mm away from the center: 74 to 80 Surface: 75 to 83.
References Cited (Backward Citations)
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US4858924A
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US5131662A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-04-18 | 1997-10-18 | 1998-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-18 | 2001-10-18 | 2002-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-18 | 2005-10-18 | 2006-04-19 | $7700.00 | Window Closed / Lapsed |