US5290036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cavity back iron with vibration dampening material in rear cavity
Assignee: Topgolf Callaway Brands Corp
•
Filing: 1993-04-12
•
Granted: 1994-03-01
•
Expires: 2013-04-12
Abstract
Abstract A cavity back iron with vibration dampening material in the cavity. The material is a polyurethane having a hardness of 20-50 Shore D, a flexural modulus of 1,000-50,000 p.s.i., a percent elongation of 100-600, and a tensile strength of 2,000-8,000 p.s.i.
Inventors
- 👤 Frank Fenton
- 👤 Michael J. Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:39
CPC Classifications
A; A63; A63B; A63B53/00; A63B53/04; A63B53/047; A63B60/00; A63B2209/00; A63B60/54; Y; Y10; Y10S; Y10S273/00; Y10S273/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
An iron-type golf club having a shaft and a head, said head comprising a striking face; a cavity having an inner surface and defining a rear of said head opposite said striking face; a polyurethane substantially filling said cavity; said polyurethane having the following properties: a hardness of substantially 20-50 Shore D; a flexural modulus of substantially 1,000-50,000 p.s.i.; a percent elongation of substantially 100-600; and a tensile strength of substantially 2,000-8,000 p.s.i.
Claim 2
Dependent Claim
73 words
An iron-type golf club having a shaft and a head, said head comprising a striking face; a cavity having an inner surface and defining a rear of said head opposite said striking face; a polyurethane substantially filling said cavity; said polyurethane having the following properties: a hardness of substantially 20-50 Shore D; a flexural modulus of substantially 1,000-50,000 p.s.i.; a percent elongation of substantially 100-600; and a tensile strength of substantially 2,000-8,000 p.s.i.
Claim 3
Dependent Claim
33 words
The golf club of claim 1 wherein the hardness of said polyurethane is 30-40 Shore D, the flexural modulus is 10,000-30,000 p.s.i., the percent elongation is 300-400, and the tensile strength is 4,000-6,000.
Claim 4
Dependent Claim
35 words
The golf club of claim 1 wherein said polyurethane is the reaction product of an MDI isocyanate (4,4'-diphenylmethane diisocyanate) or MDI prepolymer, a polyether or polyester polyol, and a low molecular weight diol chain extender.
Claim 5
Dependent Claim
13 words
The golf club of claim 3 wherein said diol chain extender is propanediol.
Claim 6
Dependent Claim
13 words
The golf club of claim 3 wherein said diol chain extender is butanediol.
Claim 7
Dependent Claim
21 words
The golf club of claim 1 further comprising a shock-absorbing gel between the inner surface of said cavity and said polyurethane.
Claim 8
Dependent Claim
24 words
The golf club of claim 6 wherein said shock-absorbing gel is selected from a group comprising silicone rubber PVC plastisol synthetic rubber natural rubber.
Claim 9
Dependent Claim
21 words
The golf club of claim 1 further comprising a shock-absorbing foam between the inner surface of said cavity and said polyurethane.
Claim 10
Dependent Claim
24 words
The golf club of claim 8 wherein said shock-absorbing foam is selected from a group comprising silicone rubber PVC plastisol synthetic rubber natural rubber.
References Cited (Backward Citations)
US3937474A
Cited
US4326716A
Cited
US4462589A
Cited
US4582321A
Cited
US4624460A
Cited
US4740345A
Cited
US4653756A
Cited
US4964640A
Cited
US4936582A
Cited
US5178392A
Cited
US5244211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-02-28 | 1997-08-30 | 1998-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-28 | 2001-08-30 | 2002-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-28 | 2005-08-30 | 2006-03-01 | $7700.00 | Window Closed / Lapsed |