US5967907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-piece solid golf ball
Assignee: Dunlop Sports Co Ltd
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Filing: 1997-10-28
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Granted: 1999-10-19
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Expires: 2017-10-28
Abstract
Abstract The present invention provides a multi-piece solid golf ball having excellent durability, excellent shot feel when hitting and good productivity. The present invention relates to a multi-piece solid golf ball which includes a solid core having a inner core and at least one outer core layer formed on the inner core, and a cover covering the solid core, wherein the inner core and outer core are formed from the material obtained by dispersing rubber in an ionomer resin and dynamically vulcanizing it with a vulcanizing agent, wherein the rubber particles dispersed in the ionomer resin have a particle size of not more than 10 μm, the outer core layer has a Shore D hardness of more than that of the inner core by 5 to 30, and a weight ratio of the ionomer resin to the rubber particles is within the range of 95:5 to 30:70.
Inventors
- 👤 Kohei Takemura
- 👤 Akihiro Nakahara
- 👤 Akihiko Hamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:14
CPC Classifications
A; A63; A63B; A63B37/00; A63B37/0003; A63B37/0023; A63B37/0029; A63B37/0031; A63B37/007; A63B37/0072; A63B37/0075; Y; Y10; Y10S; Y10S273/00; Y10S273/22
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
122 words
A multi-piece solid golf ball comprising a solid core consisting of an inner core and at least one outer core layer formed on the inner core, and a cover covering the solid core, wherein the inner core and outer core layer are formed from a material obtained by dispersing rubber in an ionomer resin and dynamically vulcanizing it with a vulcanizing agent, wherein the rubber particles dispersed in the ionomer resin have a particle size of not more than 10 μm, the outer core layer has a Shore D hardness of more than that of the inner core by 5 to 30, and a weight ratio of the ionomer resin to the rubber particles is within the range of 95:5 to 30:70.
Claim 2
Dependent Claim
122 words
A multi-piece solid golf ball comprising a solid core consisting of an inner core and at least one outer core layer formed on the inner core, and a cover covering the solid core, wherein the inner core and outer core layer are formed from a material obtained by dispersing rubber in an ionomer resin and dynamically vulcanizing it with a vulcanizing agent, wherein the rubber particles dispersed in the ionomer resin have a particle size of not more than 10 μm, the outer core layer has a Shore D hardness of more than that of the inner core by 5 to 30, and a weight ratio of the ionomer resin to the rubber particles is within the range of 95:5 to 30:70.
Claim 3
Dependent Claim
36 words
The multi-piece solid golf ball according to claim 1 wherein the inner core has a Shore D hardness of 20 to 50, and the outer core layer has a Shore D hardness of 25 to 65.
Claim 4
Dependent Claim
29 words
The multi-piece solid golf ball according to claim 2 wherein the weight ratio of the ionomer resin to the rubber particles is within the range of 90:10 to 40:60.
Claim 5
Dependent Claim
23 words
The multi-piece solid golf ball according to claim 2 wherein the rubber particles have a particle size of from 0.001 to 5 μm.
Claim 6
Dependent Claim
23 words
The multi-piece solid golf ball according to claim 2 wherein the rubber particles have a particle size of not more than 2.5 μm.
Claim 7
Dependent Claim
39 words
The multi-piece solid golf ball according to claim 1 or claim 2 wherein the rubber particles for the outer core is formed from ethylene-propylene-diene rubber (EPDM), and the rubber particles for the inner core are formed from butadiene rubber.
Claim 8
Dependent Claim
29 words
The multi-piece solid golf ball according to claim 6 wherein the weight ratio of the ionomer resin to the rubber particles is within the range of 90:10 to 40:60.
Claim 9
Dependent Claim
23 words
The multi-piece solid golf ball according to claim 6 wherein the rubber particles have a particle size of from 0.001 to 5 μm.
Claim 10
Dependent Claim
23 words
The multi-piece solid golf ball according to claim 6 wherein the rubber particles have a particle size of not more than 2.5 μm.
Claim 11
Dependent Claim
29 words
The multi-piece solid golf ball according to claim 1 wherein the weight ratio of the ionomer resin to the rubber particles is within the range of 90:10 to 40:60.
Claim 12
Dependent Claim
23 words
The multi-piece solid golf ball according to claim 1 wherein the rubber particles have a particle size of from 0.001 to 5 μm.
Claim 13
Dependent Claim
23 words
The multi-piece solid golf ball according to claim 1 wherein the rubber particles have a particle size of not more than 2.5 μm.
References Cited (Backward Citations)
US4714253A
Cited
US5253871A
Cited
US5439227A
Cited
US5733974A
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JPH08113679A
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US5688191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-10-18 | 2003-04-19 | 2003-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-10-18 | 2007-04-19 | 2007-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-10-18 | 2011-04-19 | 2011-10-19 | $7700.00 | Window Closed / Lapsed |