US4863167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-piece solid golf ball
Assignee: Sumitomo Rubber Industries Ltd
•
Filing: 1988-02-17
•
Granted: 1989-09-05
•
Expires: 2008-02-17
Abstract
Abstract A three piece solid golf ball having improved rebound characteristics and a higher initial velocity which includes a center portion, an outer layer disposed over the center portion, and a cover disposed over the outer layer. The outer layer is formed from a rubber composition containing a base rubber, and has a base rubber volume content ratio of at least 0.65. The rubber composition of the outer layer further contains a gravity filler with a high specific gravity such that the outer layer has a higher specific gravity than the center, wherein the difference in specific gravity between the outer layer and the center varies from 0.15 to 0.8 for a small size golf ball and from 0.15 to 0.45 for a large size golf ball. The gravity filler may be selected from tungsten, tungsten carbide, molybdenum, lead, lead dioxide, nickel, or copper.
Inventors
- 👤 Taketo Matsuki
- 👤 Akihiro Nakahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:32
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/08; A; A63; A63B; A63B37/00; A63B37/0003; A63B37/0023; A63B37/0029; A63B37/0033; A63B37/0035; A63B37/005; A63B37/006; A63B37/0064; A63B37/007; A63B37/0072; A63B37/0075; A63B37/0076; Y; Y10; Y10S; Y10S273/00; Y10S273/20; Y10S273/22
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
130 words
A three piece solid golf ball having improved rebound characteristics and a higher initial velocity which comprises: a center portion; an outer layer disposed over said center portion; and a cover disposed over said outer layer; wherein said outer layer is formed from a rubber composition containing a base rubber, said outer layer having a base rubber volume content ratio of at least 0.65, and wherein said rubber composition of said outer layer further contains a gravity filler with a high specific gravity such that said outer layer has a higher specific gravity than said center, the difference in specific gravity between said outer layer and said center varying from 0.15 to 0.8 for a small size golf ball and from 0.15 to 0.45 for a large size golf ball.
Claim 2
Dependent Claim
130 words
A three piece solid golf ball having improved rebound characteristics and a higher initial velocity which comprises: a center portion; an outer layer disposed over said center portion; and a cover disposed over said outer layer; wherein said outer layer is formed from a rubber composition containing a base rubber, said outer layer having a base rubber volume content ratio of at least 0.65, and wherein said rubber composition of said outer layer further contains a gravity filler with a high specific gravity such that said outer layer has a higher specific gravity than said center, the difference in specific gravity between said outer layer and said center varying from 0.15 to 0.8 for a small size golf ball and from 0.15 to 0.45 for a large size golf ball.
Claim 3
Dependent Claim
39 words
The three piece solid golf ball of claim 1, wherein the gravity filler having a high specific gravity is at least one member selected from the group consisting of tungsten, tungsten carbide, molybdenum, lead, lead dioxide, nickel, and copper.
Claim 4
Dependent Claim
39 words
The three piece solid golf ball of claim 2, wherein the outer layer and the center are formed from a rubber composition, said rubber composition containing a base rubber, a crosslinking agent, a co-crosslinking agent, and a composition filler.
Claim 5
Dependent Claim
96 words
The three piece solid golf ball of claim 3, wherein the base rubber is selected from the group consisting of natural rubber, synthetic rubber, and 1,4-polybutadiene; wherein the crosslinking agent is selected from the group consisting of organic peroxides, dicumyl peroxide, t-butyl peroxide, azo compounds, and azobisisobutyronitrile; wherein the co-crosslinking agent is a metal salt of an unsaturated fatty acid selected from the group consisting of zinc acrylate, zinc methacrylate, magnesium acrylate, magnesium methacrylate; and wherein the composition filler is selected from the group consisting of zinc oxide, barium sulfate, silica, calcium carbonate, and zinc carbonate.
Claim 6
Dependent Claim
46 words
The three piece solid golf ball of claim 2, wherein the amount of crosslinking agent is from 0.5 to 3.0 parts by weight and amount of co-crosslinking agent is from 30 to 40 parts by weight based on 100 parts by weight of the base rubber.
Claim 7
Dependent Claim
66 words
The three piece solid golf ball of claim 2, wherein the base rubber volume content is from 0.7 to 0.9 and wherein the amount of gravity filler in a small size golf ball is from 3 to 150 parts by weight and in a large size golf ball is from 3 to 80 parts by weight based on 100 parts by weight of the base rubber.
Claim 8
Dependent Claim
39 words
The three piece solid golf ball of claim 1, wherein the outer layer and the center are formed from a rubber composition, said rubber composition containing a base rubber, a crosslinking agent, a co-crosslinking agent, and a composition filler.
Claim 9
Dependent Claim
96 words
The three piece solid golf ball of claim 7, wherein the base rubber is selected from the group consisting of natural rubber, synthetic rubber, and 1,4-polybutadiene; wherein the crosslinking agent is selected from the group consisting of organic peroxides, dicumyl peroxide, t-butyl peroxide, azo compounds, and azobisisobutyronitrile; wherein the co-crosslinking agent is a metal salt of an unsaturated fatty acid selected from the group consisting of zinc acrylate, zinc methacrylate, magnesium acrylate, magnesium methacrylate; and wherein the composition filler is selected from the group consisting of zinc oxide, barium sulfate, silica, calcium carbonate, and zinc carbonate.
Claim 10
Dependent Claim
47 words
The three piece solid golf ball of claim 7, wherein the amount of crosslinking agent is from 0.5 to 3.0 parts by weight and the amount of co-crosslinking agent is from 30 to 40 parts by weight based on 100 parts by weight of the base rubber.
Claim 11
Dependent Claim
66 words
The three piece solid golf ball of claim 7, wherein the base rubber volume content is from 0.7 to 0.9 and wherein the amount of gravity filler in a small size golf ball is from 3 to 150 parts by weight and in a large size golf ball is from 3 to 80 parts by weight based on 100 parts by weight of the base rubber.
Claim 12
Dependent Claim
38 words
The three piece solid golf ball of claim 7, wherein the base rubber is 1,4-polybutadiene with a cis-structure of at least 40% and wherein the gravity filler is selected from the group consisting of tungsten and tungsten carbide.
Claim 13
Dependent Claim
31 words
The three piece solid golf ball of claim 11, wherein the crosslinking agent is dicumyl peroxide, wherein the co-crosslinking agent is zinc acrylate, and wherein the composition filler is zinc oxide.
Claim 14
Dependent Claim
20 words
The three piece solid golf ball of claim 12, wherein the outer layer and the center additionally contain an antioxidant.
Claim 15
Dependent Claim
31 words
The three piece solid golf ball of claim 13, wherein the cover comprises an ionomer resin and an inorganic filler selected from the group consisting of titanium oxide and zinc oxide.
Claim 16
Dependent Claim
48 words
The three piece solid golf ball of claim 14, wherein the diameter of the center portion is from 20 to 35 mm, wherein the thickness of the outer layer is from 2 to 10 mm, and wherein the thickness of the cover is from 0.5 to 3.0 mm.
Claim 17
Dependent Claim
35 words
The three piece solid golf ball of claim 14, wherein the thickness of the cover is from 1.0 mm to 2.5 mm and whereby said golf ball exhibits improved rebound characteristics and flight distance characteristics.
References Cited (Backward Citations)
CA763821A
Cited
GB189518233A
Cited
GB189902807A
Cited
US1470302A
Cited
US1568514A
Cited
US2741480A
Cited
GB1095615A
Cited
US4625964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |