US5048838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-piece solid golf ball
Assignee: Bridgestone Corp
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Filing: 1990-03-15
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Granted: 1991-09-17
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Expires: 2010-03-15
Abstract
Abstract The inner layer of the core has a diameter of 15-25 mm, a weight of 2-14 grams, a specific gravity of 1.2-4, and a hardness of 55-80 JIS C. The outer layer has a specific gravity lower than that of the inner layer by 0.1-3.0. The cover has a radial thickness of 1.5-2.5 mm. A three-piece solid golf ball comprising a two-piece solid core consisting of inner and outer layers and a cover enclosing the core is improved in durability and flying performance through a proper choice of physical parameters of the core inner and outer layers and the cover.
Inventors
- 👤 Toshio Chikaraishi
- 👤 Hidetoshi Ieiri
- 👤 Kazuhiko Sugai
- 👤 Kazuto Maehara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:38
CPC Classifications
A; A63; A63B; A63B37/00; A63B37/0003; A63B37/0023; A63B37/0029; A63B37/0031; A63B37/0033; A63B37/005; A63B37/0051; A63B37/006; A63B37/0062; A63B37/00621; A63B37/00622; A63B37/0064; A63B37/0066; A63B37/0067; A63B37/007; A63B37/0072; A63B37/0075; A63B37/0077; A63B37/0084; A63B37/0091; A63B37/008; A63B37/0083
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
109 words
A three-piece solid golf ball comprising: a two-piece solid core consisting of an inner layer and an outer layer and a cover enclosing the core, wherein said two-piece solid core consists of the inner layer having a diameter in the range of 15 to 25 mm, a weight in the range of 5 to 12 grams, a specific gravity of 1.56 to 4, and a hardness in the range of 55 to 80 in JIS C hardness scale, and the outer layer having a lower specific gravity than that of the inner layer by 0.5 to 1.5, and said cover having a radial thickness of 1.5 to 2.5 mm.
Claim 2
Dependent Claim
109 words
A three-piece solid golf ball comprising: a two-piece solid core consisting of an inner layer and an outer layer and a cover enclosing the core, wherein said two-piece solid core consists of the inner layer having a diameter in the range of 15 to 25 mm, a weight in the range of 5 to 12 grams, a specific gravity of 1.56 to 4, and a hardness in the range of 55 to 80 in JIS C hardness scale, and the outer layer having a lower specific gravity than that of the inner layer by 0.5 to 1.5, and said cover having a radial thickness of 1.5 to 2.5 mm.
Claim 3
Dependent Claim
31 words
The golf ball of claim 1 wherein said core inner layer has a diameter of 18 to 23 mm, and a hardness of 65 to 75 in JIS C hardness scale.
Claim 4
Dependent Claim
21 words
The golf ball of claim 1 wherein said cover has a radial thickness in the range of 1.8 to 2.3 mm.
Claim 5
Dependent Claim
20 words
The golf ball of claim 1 wherein said core inner and outer layers are formed of a polybutadiene rubber composition.
Claim 6
Dependent Claim
16 words
The golf ball of claim 1 wherein said cover is formed of an ionomer resin composition.
Claim 7
Dependent Claim
13 words
The golf ball of claim 5 wherein said cover includes an inorganic filler.
Claim 8
Dependent Claim
28 words
The golf ball of claim 1 wherein said outer layer of said core has a hardness in the range of 55 to 75 in JIS C hardness scale.
Claim 9
Dependent Claim
32 words
The golf ball of claim 1 wherein said core inner and outer layers are formed of a rubber composition comprising a base rubber, a crosslinking agent, a co-crosslinking agent, and a filler.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-09-16 | 1995-03-18 | 1995-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-16 | 1999-03-18 | 1999-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-16 | 2003-03-18 | 2003-09-17 | $7700.00 | Window Closed / Lapsed |