US5273279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Racket frame of plastic compound material
Assignee: Individual
•
Filing: 1992-06-17
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Granted: 1993-12-28
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Expires: 2012-06-17
Abstract
Abstract A racket frame of plastic compound material has a shaft and a head frame coupled with the shaft. Such racket frame is provided with a hollow shell body having a first portion making up the shaft and a second portion forming the head frame. The first portion is furnished with at least a layer of fiber-reinforced plastic material which is made from a thermoplastic plastic as a matrix and reinforced by a long fiber reinforcing material. The second portion contains at least a layer of fiber-reinforced plastic material which is made from a thermosetting plastic as a matrix and reinforced by a long fiber reinforcing material. The first and the second portions are joined together to form a junction which is wrapped around by the fiber-reinforced plastic material of the second portion. The racket frame so made is provided with superior qualities of strength, stiffness, bouncing capability, toughness, and shock-absorbing capability.
Inventors
- 👤 Chin-San You
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:03
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29C70/086; A; A63; A63B; A63B49/00; A63B49/02; A63B49/10; A63B2209/00; A63B2209/02; A63B2209/023; A63B60/00; A63B60/54; B29L; B29L2031/00; B29L2031/52; B29L2031/5245; Y; Y10; Y10S; Y10S273/00; Y10S273/23
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
166 words
A racket frame of plastic compound material comprising: a shaft and a head frame joined to said shaft; said racket frame including a hollow shell body having a first portion making up said shaft and a second portion forming said head frame, an end of said first portion having two branches, said second portion having a jaw portion with two open ends, said first portion provided with at least a layer of fiber-reinforced plastic material which is made from a thermoplastic plastic as a matrix and reinforced by a long fiber reinforcing material, said second portion provided with at least a layer of fiber-reinforced plastic material which is made from a thermosetting plastic as a matrix and reinforced by a long fiber reinforcing material, said two branches respectively coupled with said two open ends of said second portion in such a manner that each end of said two branches is wrapped around by and in direct contact with said fiber-reinforced plastic material of said second portion.
Claim 2
Dependent Claim
166 words
A racket frame of plastic compound material comprising: a shaft and a head frame joined to said shaft; said racket frame including a hollow shell body having a first portion making up said shaft and a second portion forming said head frame, an end of said first portion having two branches, said second portion having a jaw portion with two open ends, said first portion provided with at least a layer of fiber-reinforced plastic material which is made from a thermoplastic plastic as a matrix and reinforced by a long fiber reinforcing material, said second portion provided with at least a layer of fiber-reinforced plastic material which is made from a thermosetting plastic as a matrix and reinforced by a long fiber reinforcing material, said two branches respectively coupled with said two open ends of said second portion in such a manner that each end of said two branches is wrapped around by and in direct contact with said fiber-reinforced plastic material of said second portion.
Claim 3
Dependent Claim
44 words
The racket frame of plastic compound material according to claim 1 wherein said thermoplastic plastic of said first portion is a thermoplastic multifilament binding yarn and wherein said long fiber reinforcing material of said first portion is commingled with said thermoplastic multifilament binding yarn.
Claim 4
Dependent Claim
33 words
The racket frame of plastic compound material according to claim 1 wherein said fiber-reinforced plastic material of said second portion is made from a long fiber fabric sheet preimpregnated in a thermosetting resin.
Claim 5
Dependent Claim
36 words
The racket frame of plastic compound material according to claim 1 wherein said thermoplastic plastic of said first portion has a melting point higher than a curing point of said thermosetting plastic of said second portion.
Claim 6
Dependent Claim
44 words
The racket frame of plastic compound material according to claim 3 wherein said first portion and said second portion are coupled to form a junction which is wrapped with at least a layer of said long fiber fabric sheet preimpregnated in said thermosetting resin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-12-27 | 1997-06-28 | 1997-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-27 | 2001-06-28 | 2001-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-27 | 2005-06-28 | 2005-12-28 | $7700.00 | Window Closed / Lapsed |