US4399992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structural member having a high strength to weight ratio and method of making same
Assignee: HORSLEY MARTHA W
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Filing: 1980-03-10
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Granted: 1983-08-23
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Expires: 2000-03-10
Abstract
Abstract A novel structural member, such as a tennis racket, and the method for making same, provides a high strength to weight ratio. The structural member of this invention consists of a fiberglass shell which surrounds a syntactic foam core. The fiberglass shell may be further selectively reinforced with a ribbon which is formed from a high strength fiber such as boron fibers, graphite fibers, aramid fibers, etc. Because the structure of this invention incorporates a high strength to weight ratio it can be utilized in the manufacture of rackets of conventional and radical design. This invention relates to a structural member consisting of a tennis racket having a high strength to weight ratio.
Inventors
- 👤 Robert P. Molitor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:29
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/68; B29C70/86; B29C70/865; A; A63; A63B; A63B49/00; A63B49/02; A63B49/10; A63B60/00; A63B60/54; B29C70/02; B29C70/021; B29C70/025; A63B2049/0211; A63B2209/00; A63B2209/02; A63B2209/023; B29K; B29K2105/00; B29K2105/04; B29K2105/06; B29K2105/08; B29K2105/0809; B29K2105/0845; B29K2105/16; B29K2105/165; B29K2277/00; B29K2277/10; B29K2307/00; B29K2307/02; B29K2309/00; B29K2309/08; B29L; B29L2031/00; B29L2031/52; B29L2031/5245; Y; Y10; Y10S; Y10S273/00; Y10S273/07; Y10S273/08; Y10S273/23
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
73 words
In a racket frame having a head, throat and handle, an improved construction wherein said frame comprises a core consisting of a mixture of syntactic foam and a blowable non-syntactic foam; a fiberglass outer shell bonded to and substantially covering said core; and the racket frame further comprising high strength fiber material comprising a ribbon of graphite material woven together by aramid fibers located about at least a portion of said racket frame.
Claim 2
Dependent Claim
73 words
In a racket frame having a head, throat and handle, an improved construction wherein said frame comprises a core consisting of a mixture of syntactic foam and a blowable non-syntactic foam; a fiberglass outer shell bonded to and substantially covering said core; and the racket frame further comprising high strength fiber material comprising a ribbon of graphite material woven together by aramid fibers located about at least a portion of said racket frame.
Claim 3
Dependent Claim
20 words
The racket frame of claim 1 wherein said high strength fiber material is adjacent both faces of the racket frame.
Claim 4
Dependent Claim
19 words
The racket frame of claim 1 wherein said ribbon has a width of between 3/8 inch and 1/2 inch.
Claim 5
Dependent Claim
14 words
The racket of claim 1 wherein said ribbon has a width of 3/8 inches.
References Cited (Backward Citations)
US3585157A
Cited
US3510392A
Cited
US3690658A
Cited
US3707434A
Cited
US3755037A
Cited
US3849350A
Cited
US4133708A
Cited
US4061520A
Cited
US4135035A
Cited
US4145047A
Cited
US4173670A
Cited
US4221382A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |