US4391088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
String for sports rackets
Assignee: UNITES STATES TENNIS GUT ASSOCIATION Inc
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Filing: 1982-01-13
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Granted: 1983-07-05
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Expires: 2002-01-13
Abstract
Abstract A string for sports rackets consists of a gut core covered with filamentary aramid and impregnated with at least one coating of water-resistant, vapor-impermeable, flexible smooth adhesive polymeric resin, which adheres the filamentary aramid to the gut core.
Inventors
- 👤 Jerome Salsky
- 👤 Patrick K. Janis
- 👤 Kenneth E. Branen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:30
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/02; D02G3/10; A; A63; A63B; A63B51/00; A63B51/02; D02G3/44; D02G3/444; D10; D10B; D10B2331/00; D10B2331/02; D10B2331/021; Y; Y10; Y10S; Y10S273/00; Y10S273/23; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2936; Y10T428/2964; Y10T428/2967; Y10T428/2969
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
30 words
A string for sports rackets consisting of a gut core covered with filamentary aramid and impregnated with at least one coating of water-resistant, vapor-impermeable, wear-resistant, flexible smooth adhesive polymeric resin.
Claim 2
Dependent Claim
30 words
A string for sports rackets consisting of a gut core covered with filamentary aramid and impregnated with at least one coating of water-resistant, vapor-impermeable, wear-resistant, flexible smooth adhesive polymeric resin.
Claim 3
Dependent Claim
14 words
The string of claim 1, wherein the gut is unpolished sheep or beef gut.
Claim 4
Dependent Claim
16 words
The string of claim 1, wherein the filamentary aramid is helically wound around the gut core.
Claim 5
Dependent Claim
15 words
The string of claim 1, wherein the filamentary aramid is braided over the gut core.
Claim 6
Dependent Claim
24 words
The string of claim 1, wherein the adhesive resin is an air-curing polyurethane resin and two or three coatings of said resin are used.
Claim 7
Dependent Claim
15 words
The string of claim 1, wherein the string has a tensile strength of 100-140 pounds.
Claim 8
Dependent Claim
27 words
The string of claim 1, wherein the adhesive resin is air-curing polyurethane, applied from a solution of polyurethane in mixed aromatic alcohol solvent containing 20-25% of polyurethane.
Claim 9
Dependent Claim
17 words
The string of claim 5, wherein the air-curing polyurethane contains carbon black or an organic ultraviolet absorber.
Claim 10
Dependent Claim
30 words
The string of claim 4, wherein the filamentary aramid is braided over the gut core by maintaining the braiding bobbins at an angle of 40°-50° with respect to the core.
Claim 11
Dependent Claim
64 words
The string of claim 1, wherein the gut is unpolished sheep or beef gut braided with filamentary aramid over the gut core, the filamentary aramid is braided over the gut core by maintaining the braiding bobbins at an angle of 40°-50° with respect to the core, the adhesive polymeric resin is an air-curing polyurethane and the string has a tensile strength of 100-140 pounds.
Claim 12
Dependent Claim
72 words
The string of claim 1, wherein the gut is unpolished sheep or beef gut braided with filamentary aramid over the gut core, the filamentary aramid is braided over the gut core by maintaining the braiding bobbins at an angle of 40°-50° with respect to the core, the adhesive polymeric resin is an air-curing polyurethane containing carbon black or an organic ultraviolet absorber, and the string has a tensile strength of 100-140 pounds.
Claim 13
Dependent Claim
24 words
The string of claim 1, wherein the end thereof is severed diagonally and the thus-severed end is overcoated with an acrylic or epoxy resin.
Claim 14
Dependent Claim
24 words
The string of claim 10, wherein the end thereof is severed diagonally and the thus-severed end is overcoated with an acrylic or epoxy resin.
Claim 15
Dependent Claim
10 words
A sports racket strung with the string of claim 1.
Claim 16
Dependent Claim
10 words
A sports racket strung with the string of claim 10.
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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) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |