US3937474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Golf club with polyurethane insert
Assignee: Acushnet Co
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Filing: 1974-02-25
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Granted: 1976-02-10
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Expires: 1994-02-25
Abstract
Abstract Golf clubs are provided with polyurethane inserts on the striking face. These golf clubs have been found to have advantage over standard golf clubs in that a golf ball hit with these clubs travels a greater distance, all other conditions being equal.
Inventors
- 👤 John W. Jepson
- 👤 Earle F. Allen, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:49
CPC Classifications
A; A63; A63B; A63B53/00; A63B53/04; A63B53/0466; A63B60/00; A63B2209/00; A63B53/0416; A63B53/042; Y; Y10; Y10S; Y10S273/00; Y10S273/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
In a golf club comprising a shaft and a club head, the improvement which comprises a polyurethane striking plate of about 1/4 inch thickness and a hardness of from about 40 to about 75 on the Shore Durometer D Scale according to ASTM Standard D 2240 affixed to the striking face of the club head, said polyurethane being a cured reaction product of components consisting essentially of a prepolymer consisting essentially of a polytetramethylene ether glycol combined with toluene diisocyanate and having about 9.5% free isocyanate, and a curing agent for the prepolymer selected from the group consisting of tetrafunctional polyols and 4,4'-methylene-bis-2-chloroaniline, and wherein the prepolymer and the curing agent are in an equivalent weight ratio of about 1:1 for the tetrafunctional polyols and about 1.2:1 for the 4,4'-methylene-bis-2-chloroaniline.
Claim 2
Dependent Claim
130 words
In a golf club comprising a shaft and a club head, the improvement which comprises a polyurethane striking plate of about 1/4 inch thickness and a hardness of from about 40 to about 75 on the Shore Durometer D Scale according to ASTM Standard D 2240 affixed to the striking face of the club head, said polyurethane being a cured reaction product of components consisting essentially of a prepolymer consisting essentially of a polytetramethylene ether glycol combined with toluene diisocyanate and having about 9.5% free isocyanate, and a curing agent for the prepolymer selected from the group consisting of tetrafunctional polyols and 4,4'-methylene-bis-2-chloroaniline, and wherein the prepolymer and the curing agent are in an equivalent weight ratio of about 1:1 for the tetrafunctional polyols and about 1.2:1 for the 4,4'-methylene-bis-2-chloroaniline.
References Cited (Backward Citations)
US2968575A
Cited
US3188302A
Cited
US3233905A
Cited
US3172667A
Cited
US3224781A
Cited
US3390881A
Cited
US3520969A
Cited
US3482386A
Cited
US3507495A
Cited
US3571900A
Cited
US3717344A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |