Patent US4084399A successfully refreshed from Google Patents.
US4084399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gut for racket
Assignee: Nippon Carbon Co Ltd
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Filing: 1976-08-23
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Granted: 1978-04-18
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Expires: 1996-08-23
Abstract
Abstract A gut is provided for a sports racket such as a tennis racket. The gut is made with carbon fibers. The gut may be made solely of carbon fibers or there may be a combination of carbon fibers and organic and/or inorganic fibers. A coating may be provided for the resultant product which may be a synthetic resin or metallic. The carbon fiber is above 150 kg/mm2 in tensile strength.
Inventors
- 👤 Toyonosuke Kanemaru
- 👤 Yukuo Hisatomi
- 👤 Takafumi Nishimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:10
CPC Classifications
A; A63; A63B; A63B51/00; A63B51/02; D; D02; D02G; D02G3/00; D02G3/02; D02G3/22; D02G3/40; D02G3/404; D02G3/44; D02G3/444; Y; Y10; Y10S; Y10S273/00; Y10S273/23; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/2933; Y10T428/294; Y10T428/2958
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
32 words
A gut for a racket comprising a combination of carbon fibers and organic fibers, and synthetic resin mixed with said carbon fibers which are in the form of chopped carbon fiber filaments.
Claim 2
Dependent Claim
32 words
A gut for a racket comprising a combination of carbon fibers and organic fibers, and synthetic resin mixed with said carbon fibers which are in the form of chopped carbon fiber filaments.
Claim 3
Dependent Claim
27 words
A gut for a racket as claimed in claim 1, wherein the gut is composed of a combination of said carbon fibers, organic fibers and inorganic fibers.
Claim 4
Dependent Claim
21 words
A gut for a racket as claimed in claim 1, comprising aluminum, copper, tin or an alloy thereof as a coating.
Claim 5
Dependent Claim
18 words
A gut for a racket as claimed in claim 1, comprising a synthetic resin as a coating material.
Claim 6
Dependent Claim
22 words
A gut for a racket as claimed in claim 1, wherein said organic fibers and said synthetic resin are made of nylon.
Claim 7
Dependent Claim
56 words
A gut for a racket comprising a combination of carbon fibers and synthetic fibers and at least one of the two kinds of fibers is twisted to produce a combined fiber gut having a substantially linear relation between tensile modulus and elongation and wherein the modulus value ranges from about 260 Kg./gut to about 290 Kg./gut.
Claim 8
Dependent Claim
56 words
A gut for a racket comprising a combination of carbon fibers and synthetic fibers and at least one of the two kinds of fibers is twisted to produce a combined fiber gut having a substantially linear relation between tensile modulus and elongation and wherein the modulus value ranges from about 260 Kg./gut to about 290 Kg./gut.
Claim 9
Dependent Claim
40 words
A gut for a racket as claimed in claim 6 wherein the carbon fibers are in the form of multifilaments and the synthetic fibers are in the form of mono or multifilaments, the two kinds of filaments being twisted together.
Claim 10
Dependent Claim
68 words
A gut for a racket as claimed in claim 6 wherein the carbon fibers are in the form of untwisted or twisted multifilaments and the synthetic fibers are in the form of a monofilament or untwisted or twisted multifilaments, and at least one of the synthetic fiber monofilament or multifilaments being used as a core and at least one of the carbon multifilaments is twisted around the core.
Claim 11
Dependent Claim
68 words
A gut for a racket as claimed in claim 6 wherein the carbon fibers are in the form of untwisted or twisted multifilaments and the synthetic fibers are in the form of a monofilament or untwisted or twisted multifilaments, and at least one of the synthetic fiber monofilament or multifilaments is used as a core and at least one of the carbon multifilaments are twisted around the core.
Claim 12
Dependent Claim
22 words
A gut for a racket as claimed in claim 6 wherein the carbon fibers comprise a multifilament of string or tape form.
Claim 13
Dependent Claim
64 words
A gut for a racket as claimed in claim 6 comprising the combination of said carbon fibers, said synthetic fibers and inorganic fibers, at least one of the three kinds of fibers being twisted so that a combined fiber gut has a nearly linear relation between tensile modulus and elongation and has a modulus value ranging from about 260 Kg./gut to about 290 Kg./gut.
Claim 14
Dependent Claim
24 words
A gut for a racket as claimed in claim 7 wherein the combined and twisted fibers also comprises a synthetic resin as a coating.
Claim 15
Dependent Claim
24 words
A gut for a racket as claimed in claim 8 wherein the combined and twisted fibers also comprises a synthetic resin as a coating.
Claim 16
Dependent Claim
24 words
A gut for a racket as claimed in claim 9 wherein the combined and twisted fibers also comprises a synthetic resin as a coating.
Claim 17
Dependent Claim
24 words
A gut for a racket as claimed in claim 10 wherein the combined and twisted fibers also comprises a synthetic resin as a coating.
Claim 18
Dependent Claim
23 words
A gut for a racket as claimed in claim 7 wherein the combined and twisted fibers also comprises a metal as a coating.
Claim 19
Dependent Claim
23 words
A gut for a racket as claimed in claim 8 wherein the combined and twisted fibers also comprises a metal as a coating.
Claim 20
Dependent Claim
23 words
A gut for a racket as claimed in claim 9 wherein the combined and twisted fibers also comprises a metal as a coating.
Claim 21
Dependent Claim
23 words
A gut for a racket as claimed in claim 10 wherein the combined and twisted fibers also comprises a metal as a coating.
Claim 22
Dependent Claim
18 words
A gut for a racket as claimed in claim 6, wherein said synthetic fibers are made of nylon.
References Cited (Backward Citations)
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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) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |