Patent US3947029A successfully refreshed from Google Patents.
US3947029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low density cast racquet
Assignee: Magnetics International Inc
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Filing: 1974-05-31
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Granted: 1976-03-30
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Expires: 1994-05-31
Abstract
Abstract A one-piece, cast racquet of material having density not above about 3.0 grams per cubic centimeter comprises a handle and a head-portion, the latter having integral stringing means characterized by a wrought metal member bonded in the cast head portion of the racquet; and method for making same wherein the wrought metal member is assembled in the head-portion of a die set and the resulting die cavity filled with the low density material thereby forming the cast handle and head-portion of the racquet and simultaneously bonding the wrought metal stringing member therein. The term "cast" will be understood to include metal die-casting and plastic pressure moulding operations.
Inventors
- 👤 Peter Christopher John Gallagher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:55
CPC Classifications
A; A63; A63B; A63B49/00; A63B49/02; A63B49/022; A63B49/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
126 words
A cast racquet comprising an integral solid head-portion enclosing a stringing area, a handle, and stringing means conforming to the shape of said head-portion, said head-portion and handle formed of low density castable material, said stringing means consisting of a separate, one-piece, wrought sheet metal member Z-shaped in cross section, said Z-shaped wrought metal member having an outer portion comprising an implant encapsulated by said cast head-portion, and a perforated inner stringing portion extending inwardly beyond the inner peripheral wall of said head-portion and in the plane of the stringing area of said cast head-portion, the said outer encapsulated portion of said Z-shaped member being displaced vertically from its inner perforated stringing portion the perforations of which constitute apertures for receiving the strings of said racquet.
Claim 2
Dependent Claim
126 words
A cast racquet comprising an integral solid head-portion enclosing a stringing area, a handle, and stringing means conforming to the shape of said head-portion, said head-portion and handle formed of low density castable material, said stringing means consisting of a separate, one-piece, wrought sheet metal member Z-shaped in cross section, said Z-shaped wrought metal member having an outer portion comprising an implant encapsulated by said cast head-portion, and a perforated inner stringing portion extending inwardly beyond the inner peripheral wall of said head-portion and in the plane of the stringing area of said cast head-portion, the said outer encapsulated portion of said Z-shaped member being displaced vertically from its inner perforated stringing portion the perforations of which constitute apertures for receiving the strings of said racquet.
Claim 3
Dependent Claim
22 words
A cast racquet according to claim 1 wherein said castable material has a density not above about 3.0 grams per cubic centimeter.
Claim 4
Dependent Claim
17 words
A cast racquet according to claim 1 wherein said low density castable material is a magnesium alloy.
Claim 5
Dependent Claim
17 words
A cast racquet according to claim 1 wherein said low density castable material is an aluminum alloy.
Claim 6
Dependent Claim
26 words
A cast racquet according to claim 1 wherein said low density castable material is a plastic having a yield strength of at least about 23,000 psi.
Claim 7
Dependent Claim
28 words
A cast racquet according to claim 1 wherein said one piece Z-shaped wrought sheet metal stringing member has sheet metal a strength of at least about 40,00 psi.
Claim 8
Dependent Claim
20 words
A cast racquet according to claim 6 wherein said one piece wrought sheet metal stringing member comprises Z-shaped aluminum alloy.
Claim 9
Dependent Claim
41 words
A cast racquet according to claim 1 wherein the said encapsulated outer portion of said one piece wrought Z-shaped sheet metal stringing member is provided with bonding means constructed and arranged to bond said wrought metal member in said cast head-portion.
Claim 10
Dependent Claim
30 words
A cast racquet according to claim 1 wherein the thickness of said one piece Z-shaped wrought sheet metal stringing member is in the range of from 0.03 to 0.075 inches.
Claim 11
Dependent Claim
29 words
A cast racquet according to claim 1 wherein the head-portion of said racquet and the apertured inner portion of said Z-shaped stringing means are provided with a protective coating.
Claim 12
Dependent Claim
15 words
A cast racquet according to claim 10 wherein the protective coating is a colored resin.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |