Patent US5072944A successfully refreshed from Google Patents.
US5072944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-piece solid golf ball
Assignee: Dunlop Sports Co Ltd
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Filing: 1990-04-04
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Granted: 1991-12-17
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Expires: 2010-04-04
Abstract
Abstract Disclosed is a large size three piece solid golf ball comprising a center, an outer layer covering said center to form a solid core and a cover covering said solid core, wherein said center has a diameter of 15 to 24 mm and a center hardness of 25 to 50 (JIS-C), prepared from a rubber composition comprising 100 parts by weight of cis-1,4-polybutadiene, 9 to 20 parts by weight of zinc acrylate and 3 to 150 parts by weight of a zinc oxide, said solid core has a diameter of 36 to 40 mm and a surface hardness of 70 to 90 (JIS-C), a difference between the center hardness and the surface hardness of the solid core is 20 or more and the specific gravity of the center and the outer layer has the following relation; a specific gavity of the center≧a specific gravity of the outer layer, and the specific gravity of the center≧1.1.
Inventors
- 👤 Akihiro Nakahara
- 👤 Mikio Yamada
- 👤 Tadahiro Ebisuno
- 👤 Takashi Sasaki
- 👤 Kengo Oka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:05
CPC Classifications
A; A63; A63B; A63B37/00; A63B37/0003; A63B37/0023; A63B37/0029; A63B37/0033; A63B37/005; A63B37/006; A63B37/0062; A63B37/0063; A63B37/0064; A63B37/0066; A63B37/007; A63B37/0072; A63B37/0075; A63B37/0077; A63B37/0091
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
158 words
A large size three piece solid golf ball comprising a center core, an outer layer covering said center core to form a solid core and a cover covering said solid core, wherein said center has a diameter of 15 to 24 mm and a center hardness of 25 to 50 (JIS-C), prepared from a rubber composition comprising 100 parts by weight of cis-1,4-polybutadiene, 9 to 20 parts by weight of zinc acrylate and 3 to 150 parts by weight of zinc oxide, said solid core has a diameter of 36 to 40 mm and a surface hardness of 70 to 90 (JIS-C), a difference between the center hardness and the surface hardness of the solid core is 20 or more and the specific gravity of the center core and the outer layer has the following relation; a specific gravity of the center core ≧specific gravity of the outer layer, and the specific gravity of the center core ≧1.1.
Claim 2
Dependent Claim
158 words
A large size three piece solid golf ball comprising a center core, an outer layer covering said center core to form a solid core and a cover covering said solid core, wherein said center has a diameter of 15 to 24 mm and a center hardness of 25 to 50 (JIS-C), prepared from a rubber composition comprising 100 parts by weight of cis-1,4-polybutadiene, 9 to 20 parts by weight of zinc acrylate and 3 to 150 parts by weight of zinc oxide, said solid core has a diameter of 36 to 40 mm and a surface hardness of 70 to 90 (JIS-C), a difference between the center hardness and the surface hardness of the solid core is 20 or more and the specific gravity of the center core and the outer layer has the following relation; a specific gravity of the center core ≧specific gravity of the outer layer, and the specific gravity of the center core ≧1.1.
Claim 3
Dependent Claim
24 words
The large size three piece solid golf ball according to claim 1 wherein said center core has a hardness of 30 to 45 (JIS-C).
Claim 4
Dependent Claim
25 words
The large size three piece solid golf ball according to claim 1 wherein said solid core has a surface hardness of 75 to 85 (JIS-C).
Claim 5
Dependent Claim
23 words
The large size three piece solid golf ball according to claim 1 wherein said cover has a thickness of 0.9 to 2.9 mm.
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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) | 1994-12-16 | 1995-06-17 | 1995-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-16 | 1999-06-17 | 1999-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-16 | 2003-06-17 | 2003-12-17 | $7700.00 | Window Closed / Lapsed |