Patent US4339499A successfully refreshed from Google Patents.
US4339499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
String of a synthetic resin
Assignee: Dynamit Nobel AG
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Filing: 1980-04-02
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Granted: 1982-07-13
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Expires: 2000-04-02
Abstract
Abstract A string for the stringing of rackets, bows, musical instruments and the like which has a thread-like structure of polyvinylidene fluoride. The string is obtained by extruding a rod of polyvinylidene fluoride at a melt temperature of the polyvinylidene fluoride, cooling the rod at a temperature between 60°-150° C., and then axially stretching the rod at this temperature following by cooling the rod to room temperature and thereafter cold-stretching the monofil. The string is characterized by an elasticity that approaches that of natural gut string.
Inventors
- 👤 Gunther Tappe
- 👤 Bertram Gasper
- 👤 Herbert Laubenberger
- 👤 Richard Weiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:20
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/44; D02G3/444; D02G3/02; G; G10; G10D; G10D3/00; G10D3/10; D10; D10B; D10B2321/00; D10B2321/04; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2933; Y10T428/2962; Y10T428/2964; Y10T428/2967
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
56 words
A string for the stringing of rackets, bows, musical instruments and the like comprising a thread-like structure comprising at least one polyvinylidene fluoride monofil of a thickness of 1.2 to 1.5 mm, which is stretch oriented to impart improved elasticity thereto and which is provided with a coating consisting essentially of polytetrafluoroethylene or a silicone oil.
Claim 2
Dependent Claim
56 words
A string for the stringing of rackets, bows, musical instruments and the like comprising a thread-like structure comprising at least one polyvinylidene fluoride monofil of a thickness of 1.2 to 1.5 mm, which is stretch oriented to impart improved elasticity thereto and which is provided with a coating consisting essentially of polytetrafluoroethylene or a silicone oil.
Claim 3
Dependent Claim
20 words
A string according to claim 1, wherein the structure comprises a bundle of polyvinylidene fluoride monofils which are joined together.
Claim 4
Dependent Claim
20 words
A string according to claim 1, wherein the structure comprises a bundle of polyvinylidene fluoride monofils which are twisted together.
Claim 5
Dependent Claim
20 words
A string according to claim 1, wherein the structure comprises a bundle of polyvinylidene fluoride monofils which are braided together.
Claim 6
Dependent Claim
36 words
A string according to claim 1 or claim 2, wherein the elasticity of the polyvinylidene fluoride monofil, at a pretensioning force in the range between 170 and 320 N, approaches that of a natural gut string.
Claim 7
Dependent Claim
33 words
A string according to claim 5, wherein the relaxation of the polyvinylidene fluoride monofil, at a pretensioning force of 200 N, is equal to or lower than that of the natural gut string.
Claim 8
Dependent Claim
33 words
A string according to claim 1 or claim 2, wherein the elasticity of the polyvinylidene fluoride monofil, at a pretensioning force of 200 N, is between 2.0 to 5.0·10 -4 N -1 .
Claim 9
Dependent Claim
37 words
A string according to claim 1 or claim 2, wherein the polyvinylidene fluoride monofil is a monofil that has been axially stretched in a ratio of between 1:3 and 1:10, to effect stretch orientation of polyvinylidene fluoride.
Claim 10
Dependent Claim
50 words
A string according to claim 8, wherein the polyvinylidene fluoride monofil is a monofil that has subsequently been stretched at least once, the subsequent stretching effecting an elongation of the polyvinylidene fluoride monofil of between 1% and 3% whereby the elasticity of the monofil is set to a desired value.
Claim 11
Dependent Claim
37 words
A string according to claim 1 or claim 2, wherein the polyvinylidene fluoride monofil is a monofil that has been axially stretched in a ratio of between 1:4 to 1:5 to effect stretch orientation of polyvinylidene fluoride.
Claim 12
Dependent Claim
34 words
A string according to claim 8, wherein the polyvinylidene fluoride monofil is a monofil that has been stretched at least twice, once at a temperature of from 60°-150° C. and subsequently at room temperature.
Claim 13
Dependent Claim
78 words
A string according to claim 1 or claim 11, wherein said monofil is useful as a stringing for ball rackets, especially tennis rackets, said monofil having an elasticity of 2.7 to 3.6·10 -4 N -1 at a pretensioning force of 200 N, an ultimate elongation of 16-30%, a tear strength of between 300 and 500 N/mm 2 , a knot tear strength of 200-500 N, and a relaxation ##EQU2## at a diameter of the string of 1.2-1.5 mm.
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) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |