Patent US4650193A successfully refreshed from Google Patents.
US4650193A
Expired / Lapsed
US
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Golf ball
Assignee: Spalding and Evenflo Companies Inc
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Filing: 1984-12-10
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Granted: 1987-03-17
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Expires: 2004-12-10
Abstract
Abstract Disclosed is a two-piece golf ball and methods for its production. The ball comprises a core having a central portion of a cross-linked, hard, resilient material and having a soft, deformable outer layer. Balls comprising the novel cores and a conventional cover material having playability properties approaching or exceeding thread-wound balata covered balls. The core is preferably manufactured by surface treating a slug of a suitable, curable elastomer composition with a cure altering agent, and molding the slug under conditions to produce a spherical core having a hardness gradient in its surface layers.
Inventors
- 👤 Robert P. Molitor
- 👤 Terrence Melvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:14
CPC Classifications
A; A63; A63B; A63B37/00; A63B37/0003; A63B37/0023; A63B37/0029; A63B37/0031; A63B37/0038; A63B37/004; A63B37/0043; A63B37/0045; A63B37/005; A63B37/006; A63B37/0062; A63B37/00621; A63B37/007; A63B37/0072; A63B37/0075; A63B37/0077; A63B37/0092; A63B45/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
57 words
A golf ball having a molded cover and a separately molded, resilient, spherical core, said core comprising: a central portion having a Shore C hardness greater than 75; and, an outer layer, integral with and disposed radially outwardly from said central portion, having a Shore A hardness less than 80, and a thickness greater than 1/32 inch.
Claim 2
Dependent Claim
57 words
A golf ball having a molded cover and a separately molded, resilient, spherical core, said core comprising: a central portion having a Shore C hardness greater than 75; and, an outer layer, integral with and disposed radially outwardly from said central portion, having a Shore A hardness less than 80, and a thickness greater than 1/32 inch.
Claim 3
Dependent Claim
28 words
The ball of claim 1 wherein the central portion comprises a first, cross-linked elastomer and the outer layer comprises a second elastomer cross-linked differently from said first elastomer.
Claim 4
Dependent Claim
15 words
The ball of claim 2 wherein said first and second elastomers comprise the same elastomer.
Claim 5
Dependent Claim
37 words
The ball of claim 1 wherein said core comprises an elastomer material having a hardness gradient between said central portion and said outer layer formed during a simultaneous cure of said central portion and said outer layer.
Claim 6
Dependent Claim
11 words
The ball of claim 1 wherein said core comprises cross-linked polybutadiene.
Claim 7
Dependent Claim
20 words
The ball of claim 5 wherein said core comprises a metal salt of an alpha, beta ethylinically unsaturated monocarboxylic acid.
Claim 8
Dependent Claim
29 words
The ball of claim 6 wherein said core comprises a zinc salt selected from the group consisting of zinc diacrylate, zinc dimethacrylate, zinc monoacrylate, zinc monomethacrylate, and mixtures thereof.
Claim 9
Dependent Claim
12 words
The ball of claim 7 wherein said core comprises a peroxide-cured polybutadiene.
Claim 10
Dependent Claim
12 words
The ball of claim 5 wherein said core comprises a peroxide-cured polybutadiene.
Claim 11
Dependent Claim
15 words
The ball of claim 5 wherein said outer layer is cross-linked in part by sulfur.
Claim 12
Dependent Claim
17 words
The ball of claim 1 wherein said central portion has a Shore C hardness greater than 80.
Claim 13
Dependent Claim
17 words
The ball of claim 1 wherein said outer layer has a Shore A hardness less than 75.
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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) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |