US5314180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sports instrument and impact-absorbing element to be attached to sports equipment
Assignee: Toray Industries Inc
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Filing: 1992-12-16
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Granted: 1994-05-24
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Expires: 2012-12-16
Abstract
Abstract This invention relates to sports rackets with which the impact or vibration transmitted to the body such as the arms, of a user when the sports racket is used is largely reduced. The sports racket according to the present invention comprises as at least a part of the material constituting said sports racket a vibration-reducing material having a vibration loss coefficient of not less than 0.01 at room temperature, comprising epoxy resin, polyamide resin, and a filler.
Inventors
- 👤 Masahiro Yamagishi
- 👤 Masao Hijiri
- 👤 Yasuo Komatsu
- 👤 Hiroshi Edagawa
- 👤 Naoki Imaeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:54
CPC Classifications
A; A63; A63B; A63B60/00; A63B60/54
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
113 words
A sports racket having a vibration-reducing material embedded therein, wherein the vibration-reducing material has a vibration loss coefficient of not less than 0.01 at room temperature, wherein said vibration-reducing material is a thermally cured material of the following components as major constituents: (a) an epoxy resin which possesses flowability at a temperature between room temperature and 100° C., (b) a polyamide resin which possesses flowability at a temperature between room temperature and 100° C., and (c) an inorganic filler selected from the group consisting of graphite, ferrite and mica; and wherein, the sports racket is selected from the group consisting of: a tennis racket, a racket ball racket, and a squash ball racket.
Claim 2
Dependent Claim
113 words
A sports racket having a vibration-reducing material embedded therein, wherein the vibration-reducing material has a vibration loss coefficient of not less than 0.01 at room temperature, wherein said vibration-reducing material is a thermally cured material of the following components as major constituents: (a) an epoxy resin which possesses flowability at a temperature between room temperature and 100° C., (b) a polyamide resin which possesses flowability at a temperature between room temperature and 100° C., and (c) an inorganic filler selected from the group consisting of graphite, ferrite and mica; and wherein, the sports racket is selected from the group consisting of: a tennis racket, a racket ball racket, and a squash ball racket.
Claim 3
Dependent Claim
19 words
The sports racket of claim 1, wherein the vibration loss coefficient at room temperature is not less than 0.02.
Claim 4
Dependent Claim
48 words
The sports racket of claim 2 or 1, further comprising a resin layer which is reinforced with fibers, wherein said vibration-reducing material is in the form of a sheet, plate, line, block, net or ribbon, and wherein said vibration-reducing material and said resin layer integrally from the racket.
Claim 5
Dependent Claim
25 words
The sports racket of claim 3, wherein said resin layer reinforced with fibers is arranged adjacent to or in the vicinity of said vibration-reducing material.
Claim 6
Dependent Claim
28 words
The sports racket of claim 3, wherein said resin layer is reinforced with fibers in a prepreg containing carbon fibers as at least a part of said fibers.
Claim 7
Dependent Claim
24 words
The sports racket of claim 3, wherein said vibration-reducing and said resin layer which is reinforced with fibers integrally form a substantially hollow structure.
Claim 8
Dependent Claim
19 words
The sports racket of claim 3, wherein said resin layer which is reinforced with fibers comprises a thermosetting resin.
Claim 9
Dependent Claim
14 words
The sports racket of claim 7, wherein said thermosetting resin is an epoxy resin.
Claim 10
Dependent Claim
15 words
The sports racket of claim 7, wherein said thermosetting resin is an unsaturated polyester resin.
Claim 11
Dependent Claim
17 words
The sports racket of claim 2 or 1, wherein said sports racket is a racket ball racket.
Claim 12
Dependent Claim
17 words
The sports racket of claim 2 or 1, wherein said sports racket is a squash ball racket.
Claim 13
Dependent Claim
16 words
The sports racket of claim 2 or 1, wherein said sports racket is a tennis racket.
Claim 14
Dependent Claim
27 words
The sports racket of claim 2 or 1, wherein said racket comprises a fiber-reinforced resin layer and said vibration-reducing material is laminated on the reinforced resin layer.
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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) | 1997-05-23 | 1997-11-22 | 1998-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-23 | 2001-11-22 | 2002-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-23 | 2005-11-22 | 2006-05-24 | $7700.00 | Window Closed / Lapsed |