US4458475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite reinforcement cord
Assignee: Goodyear Tire and Rubber Co
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Filing: 1978-06-16
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Granted: 1984-07-10
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Expires: 1998-06-16
Abstract
Abstract A composite cord for reinforcing a tire or other elastomeric article having at least one high strength, substantially inextensible yarn spirally wrapped around a core. The core at room temperature has sufficient strength and elasticity to resist and recover from tension forces on the core required during the processing of the cord and building of the tire. The core is composed of material which loses its tensile strength when subjected to temperatures of vulcanization to permit stretching out of the yarn to allow for substantial elongation of a part or all of the tire and then provide reinforcement of the elongated tire by the stretched out, high strength yarn.
Inventors
- 👤 Georges J. E. Schmit
- 👤 Thomas N. H. Welter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:18
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/44; D02G3/48; B; B60; B60C; B60C5/00; B60C9/00; B60C9/0007; B60C9/0042; B60C9/005; B60C9/02; B60C9/04; B60C9/08; B60C9/18; B60C9/20; B60C9/2003; B60C9/2009; D10; D10B; D10B2101/00; D10B2101/20; D10B2331/00; D10B2331/02; D10B2331/021; Y; Y10; Y10S; Y10S57/00; Y10S57/902; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
146 words
A composite cord for reinforcing an elastomeric article, comprising at least one high tenacity substantially inextensible yarn spirally wrapped around a core, said core including at least one filament having at room temperature an elastic limit of at least b 2.5 kilograms and a modulus of elasticity greater than 25 grams per denier providing a barrier to elongation to resist and recover from tension forces on the cord during the processing of said cord. and elastomeric article until said core is subjected to temperatures normally used during vulcanization of rubber and thereafter said core having a reduction in tenacity after being subjected to temperatures normally used during vulcanization of rubber to permit stretching out of said yarn when said core is cooled to allow for elongation of the elastomeric article and then reinforcing of the article in the elongated condition when said yarn is stretched out.
Claim 2
Dependent Claim
146 words
A composite cord for reinforcing an elastomeric article, comprising at least one high tenacity substantially inextensible yarn spirally wrapped around a core, said core including at least one filament having at room temperature an elastic limit of at least b 2.5 kilograms and a modulus of elasticity greater than 25 grams per denier providing a barrier to elongation to resist and recover from tension forces on the cord during the processing of said cord. and elastomeric article until said core is subjected to temperatures normally used during vulcanization of rubber and thereafter said core having a reduction in tenacity after being subjected to temperatures normally used during vulcanization of rubber to permit stretching out of said yarn when said core is cooled to allow for elongation of the elastomeric article and then reinforcing of the article in the elongated condition when said yarn is stretched out.
Claim 3
Dependent Claim
22 words
The cord of claim 1 wherein said temperatures normally used during vulcanization are in the range of 120° C. to 150° C.
Claim 4
Dependent Claim
19 words
The cord of claim 1 wherein the core is composed of a polymer of the group consisting of polyolefines.
Claim 5
Dependent Claim
12 words
The cord of claim 3 wherein said polyolefines include polyethylene and polypropylene.
Claim 6
Dependent Claim
11 words
The cord of claim 1 wherein the core is a monofilament.
Claim 7
Dependent Claim
29 words
The cord of claim 1 wherein the core has an elastic limit of at least 1.5 grams per denier before being subjected to said temperatures normally used during vulcanization.
Claim 8
Dependent Claim
26 words
The cord of claim 2 wherein the core has said reduction in tenacity at a temperature in the range of from 130° C. to 140° C.
Claim 9
Dependent Claim
24 words
The cord of claim 1 wherein said yarn is composed of at least one twisted strand which is composed of filaments of reinforcing material.
Claim 10
Dependent Claim
18 words
The cord of claim 8 wherein said yarn is composed of said strand cabled together with other strands.
Claim 11
Dependent Claim
19 words
The cord of claim 8 wherein said strand has a denier in the range of from 800 to 1500.
Claim 12
Dependent Claim
50 words
The cord of claim 1 wherein a second substantially inextensible yarn of high tenacity is spirally wrapped around said core in opposed relation to said first yarn so that after said reduction in tenacity of said core and elongation of said cord said first and second yarns will twist together.
Claim 13
Dependent Claim
35 words
The cord of claim 1 wherein said yarn is wound around the core in the range of from 3 to 7 turns per centimeter and said cord is elongatable between 50 percent and 100 percent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |