US5439227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-piece solid golf ball
Assignee: Bridgestone Sports Co Ltd
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Filing: 1993-08-25
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Granted: 1995-08-08
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Expires: 2013-08-25
Abstract
Abstract A multi-piece solid golf ball has a solid core of multi-layer configuration including an inner layer circumscribed by an outer layer. The core inner layer is formed from a rubber composition. The core outer layer is formed thereon by injection molding a mixture of 100-50 wt % of a polyether ester type thermoplastic elastomer having a Shore D hardness of 30-50 and a Tg of up to -25 DEG C. and 0-50 wt % of an ethylene-(meth)acrylate copolymer ionomer having a flexural modulus of 200-400 MPa. The core is surrounded by a cover of an ethylene-(meth)acrylate copolymer ionomer having a flexural modulus of 200-450 MPa and a Shore D hardness of 55-68. The ball shows improved flying performance, feel on impact and durability and lends itself to mass production.
Inventors
- 👤 Yoshinori Egashira
- 👤 Seisuke Tomita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:03
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; C08L23/0861; A; A63; A63B; A63B37/00; A63B37/0003; C08L67/00; C08L67/02; C08L67/025; A63B37/0038; A63B37/004; A63B37/0043; A63B37/0049; A63B37/005; A63B37/006; A63B37/0064; A63B37/007; A63B37/0072; A63B37/0075; A63B37/0076; C08L2205/00; C08L2205/02; C08L23/0869; C08L23/0876
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
144 words
A multi-piece solid golf ball comprising, a solid core circumscribed by a cover, the solid core being of a multi-layer configuration including a core inner layer circumscribed by at least one core outer layer, wherein said core outer layer is formed of a material predominantly comprising a mixture of 100 to 50% by weight of a polyether ester type thermoplastic elastomer having a Shore D hardness of 30 to 50 and a glass transition temperature of up to -25° C. as measured by differential thermal analysis and 0 to 50% by weight of an ionomer in the form of an ethylene-(meth)acrylate copolymer having a flexural modulus of 200 to 400 MPa, and said cover is formed of an ionomer in the form of an ethylene-(meth)acrylate copolymer having a flexural modulus of 200 to 450 MPa and a Shore D hardness of 55 to 68.
Claim 2
Dependent Claim
144 words
A multi-piece solid golf ball comprising, a solid core circumscribed by a cover, the solid core being of a multi-layer configuration including a core inner layer circumscribed by at least one core outer layer, wherein said core outer layer is formed of a material predominantly comprising a mixture of 100 to 50% by weight of a polyether ester type thermoplastic elastomer having a Shore D hardness of 30 to 50 and a glass transition temperature of up to -25° C. as measured by differential thermal analysis and 0 to 50% by weight of an ionomer in the form of an ethylene-(meth)acrylate copolymer having a flexural modulus of 200 to 400 MPa, and said cover is formed of an ionomer in the form of an ethylene-(meth)acrylate copolymer having a flexural modulus of 200 to 450 MPa and a Shore D hardness of 55 to 68.
Claim 3
Dependent Claim
42 words
The multi-piece solid golf ball of claim 1 wherein said core inner layer is formed by heat curing a rubber composition comprising polybutadiene rubber, zinc acrylate, and a peroxide as essential components and has an outer diameter of 30 to 37 mm.
Claim 4
Dependent Claim
22 words
The multi-piece solid golf ball of claim 2, wherein said core inner layer has a JIS-C hardness in the range of 40-75.
Claim 5
Dependent Claim
33 words
The multi-piece solid golf ball of claim 1, wherein said core inner layer comprises a base rubber containing at least 90% by weight of 1.4-polybutadiene rubber with at least 90% of a CIS-structure.
Claim 6
Dependent Claim
19 words
The multi-piece solid golf ball of claim 1, wherein said thermoplastic elastomer has a Shore D hardness of 35-45.
Claim 7
Dependent Claim
29 words
The multi-piece solid golf ball of claim 1, wherein said core outer layer has a Shore D hardness of 30 to 55 and a flexural modulus of 50-270 MPa.
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) | 1998-08-07 | 1999-02-06 | 1999-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-07 | 2003-02-06 | 2003-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-07 | 2007-02-06 | 2007-08-08 | $7700.00 | Window Closed / Lapsed |