US4483537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Golf ball
Assignee: Hayakawa Rubber Co Ltd
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Filing: 1982-06-24
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Granted: 1984-11-20
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Expires: 2002-06-24
Abstract
Abstract The disclosed golf ball has a thermally cross-linked solid core with a diameter of 36.5-39.0 mm and a 1.8-2.3 mm thick shell covering the core, in which the composition of the core contains polybutadiene rubber, acrylic or methacrylic acid, an acrylic or methacrylic ester, and an organic peroxide, while the composition of the shell contains an ionomer resin, a metallic acrylate or methacrylate, and a coloring matter.
Inventors
- 👤 Hiroyoshi Hanada
- 👤 Hiroyoshi Adachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:31
CPC Classifications
A; A63; A63B; A63B37/00; A63B37/0003; A63B37/0023; A63B37/0024; A63B37/0029; A63B37/0031; A63B37/0033; A63B37/005; A63B37/0051; A63B37/006; A63B37/0064; A63B37/0067; A63B37/007; A63B37/0072; A63B37/0074; A63B37/0077; A63B37/008; A63B37/0083; Y; Y10; Y10S; Y10S524/00; Y10S524/908
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
178 words
A golf ball, comprising a solid core with a diameter of 36.5-39.0 mm formed of a thermally cross-linked composition consisting essentially of 100 parts by weight of polybutadiene rubber with at least 90% of cis-1,4 bonds; 15-25 parts by weight of an acid selected from the group consisting of acrylic acid and methacrylic acid, 1-15 parts by weight of an ester selected from the group consisting of acrylic esters and methacrylic esters, 20-70 parts by weight of zinc oxide, and 2-6 parts by weight of an organic peroxide; and a shell with a thickness of 1.8-2.3 mm covering said solid core, said shell being made of a composition consisting essentially of 100 parts by weight of an ionomer resin which consists essentially of a first metallic salt of a copolymer of ethylene and unsaturated carboxylic acid and which has a hardness of 65-70 in terms of Shore hardness D, 0.5-10 parts by weight of a second metallic salt selected from the group consisting of metallic acrylates and metallic methacrylates, and 1-5 parts by weight of a colouring matter.
Claim 2
Dependent Claim
178 words
A golf ball, comprising a solid core with a diameter of 36.5-39.0 mm formed of a thermally cross-linked composition consisting essentially of 100 parts by weight of polybutadiene rubber with at least 90% of cis-1,4 bonds; 15-25 parts by weight of an acid selected from the group consisting of acrylic acid and methacrylic acid, 1-15 parts by weight of an ester selected from the group consisting of acrylic esters and methacrylic esters, 20-70 parts by weight of zinc oxide, and 2-6 parts by weight of an organic peroxide; and a shell with a thickness of 1.8-2.3 mm covering said solid core, said shell being made of a composition consisting essentially of 100 parts by weight of an ionomer resin which consists essentially of a first metallic salt of a copolymer of ethylene and unsaturated carboxylic acid and which has a hardness of 65-70 in terms of Shore hardness D, 0.5-10 parts by weight of a second metallic salt selected from the group consisting of metallic acrylates and metallic methacrylates, and 1-5 parts by weight of a colouring matter.
Claim 3
Dependent Claim
40 words
A golf ball as set forth in claim 1, wherein said ester in the solid core is at least one ester selected from the group consisting of ethylene dimethacrylate, 1,3-butylene dimethacrylate, 1,4-butylene diamethacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, and pentaerythritol triacrylate.
Claim 4
Dependent Claim
15 words
A golf ball as set forth in claim 1, wherein said organic peroxide is 1,1-di-tertiary-butylperoxy-3,3,5-trimethylcyclohexane.
Claim 5
Dependent Claim
42 words
A golf ball as set forth in claim 1, wherein said metallic salt is at least one metallic salt selected from the group consisting of magnesium acrylate, magnesium methacrylate, calcium acrylate, calcium methacrylate, zinc acrylate, zinc methacrylate, aluminum acrylate, and aluminum methacrylate.
Claim 6
Dependent Claim
30 words
A golf ball as set forth in claim 1, wherein said composition of the solid core further contains a filler selected from the group consisting of barium sulfate and silica.
Claim 7
Dependent Claim
29 words
A golf ball as set forth in claim 1, wherein said colouring matter is selected from the group consisting of titanium dioxide, zinc oxide, inorganic pigments, and organic pigments.
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) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |