Patent US5135223A successfully refreshed from Google Patents.
US5135223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sports racket frame
Assignee: Individual
•
Filing: 1991-04-24
•
Granted: 1992-08-04
•
Expires: 2011-04-24
Abstract
Abstract A sports racket frame comprises an outer shell made of a fiber-reinforced composite. Located at a predetermined area of the outer shell encasing the handle portion are slits in the shell and a plurality of strength-reinforcing and shock-absorbing inlay pieces which reduce effectively the shock wave originating from the ball-hitting surface to a minimum and to give the racket frame an added elasticity and rigidity.
Inventors
- 👤 Chin-San You
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:06
CPC Classifications
A; A63; A63B; A63B60/00; A63B60/54; A63B2208/00; A63B2208/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
117 words
A sports racket frame having a head portion, a handle portion and a throat portion connecting the head portion to the handle portion, the frame including a multi-ply outer shell of resin-impregnated fibrous fabric with a part of said shell encasing one end of the handle portion which is adjacent the throat portion, said part of the shell being severed by a plurality of slits cutting through fibers of the shell for inhibiting the transmission of shock waves from the head portion of the frame to the handle portion of the frame, the number of fibers cut by the slits comprising from 5% to 95% of the total number of fibers in said part of the shell.
Claim 2
Dependent Claim
117 words
A sports racket frame having a head portion, a handle portion and a throat portion connecting the head portion to the handle portion, the frame including a multi-ply outer shell of resin-impregnated fibrous fabric with a part of said shell encasing one end of the handle portion which is adjacent the throat portion, said part of the shell being severed by a plurality of slits cutting through fibers of the shell for inhibiting the transmission of shock waves from the head portion of the frame to the handle portion of the frame, the number of fibers cut by the slits comprising from 5% to 95% of the total number of fibers in said part of the shell.
Claim 3
Dependent Claim
23 words
A sports racket frame according to claim 1, wherein the slits are oriented substantially transversely to a longitudinal axis of said handle portion.
Claim 4
Dependent Claim
17 words
A sports racket frame according to claim 1, wherein said slits are disposed in different transverse planes.
Claim 5
Dependent Claim
21 words
A sports racket frame according to claim 1, wherein said part of the shell includes an annular recess containing the slits.
Claim 6
Dependent Claim
21 words
A sports racket frame according to claim 4, wherein said part of the shell is encased by an elastic covering layer.
Claim 7
Dependent Claim
16 words
A sports racket frame according to claim 5, wherein the covering layer comprises a polymeric material.
Claim 8
Dependent Claim
40 words
A sports racket frame according to claim 1, wherein said part of the frame is encased by an elastic covering layer and a plurality of shock-absorbing inlay pieces are disposed between said part of the shell and said covering layer.
Claim 9
Dependent Claim
25 words
A sports racket frame according to claim 7, wherein the inlay pieces are received in axially extending slots formed in said part of the shell.
Claim 10
Dependent Claim
16 words
A sports racket frame according to claim 7, wherein the inlay pieces comprise a plastic material.
Claim 11
Dependent Claim
16 words
A sports racket frame according to claim 7, wherein the inlay pieces comprise a metal material.
Claim 12
Dependent Claim
16 words
A sports racket frame according to claim 7, wherein the inlay pieces comprise a wood material.
References Cited (Backward Citations)
GB323770A
Cited
GB442975A
Cited
US2257326A
Cited
US4278251A
Cited
US4203596A
Cited
US4441713A
Cited
US4627635A
Cited
US4671511A
Cited
US4660832A
Cited
US4907810A
Cited
US4765856A
Cited
GB2218642A
Cited
US5042805A
Cited
US5039096A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-04 | 1996-02-03 | 1996-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-04 | 2000-02-03 | 2000-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-04 | 2004-02-03 | 2004-08-04 | $7700.00 | Window Closed / Lapsed |