Patent US3977172A successfully refreshed from Google Patents.
US3977172A
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US
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Reinforcement cord
Assignee: EIDP Inc
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Filing: 1975-02-06
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Granted: 1976-08-31
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Expires: 1995-02-06
Abstract
Abstract A cord useful for mechanical rubber goods, e.g. tires, V-belts, conveyor belts, composed of twisted plies of poly(p-phenyleneterephthalamide) continuous filaments and nylon or polyester continuous filaments.
Inventors
- 👤 Jal N. Kerawalla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:04
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/44; D02G3/48; B; B60; B60C; B60C9/00; B60C9/0042; D10; D10B; D10B2331/00; D10B2331/02; D10B2331/021; D10B2331/04; Y; Y10; Y10S; Y10S57/00; Y10S57/902
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
82 words
A cord for reinforcement of mechanical rubber goods comprising a cabled yarn of one or two ends of poly(p-phenyleneterephthalamide) continuous filament yarn and one end of nylon or polyester continuous filament yarn, each end having a denier between 500 and 3000, the ends being approximately equal in size and twisted in the same direction, the combined ends being twisted approximately the same amount in the opposite direction to form a cabled yarn having a twist multiplier of between about 6 and 10.
Claim 2
Dependent Claim
82 words
A cord for reinforcement of mechanical rubber goods comprising a cabled yarn of one or two ends of poly(p-phenyleneterephthalamide) continuous filament yarn and one end of nylon or polyester continuous filament yarn, each end having a denier between 500 and 3000, the ends being approximately equal in size and twisted in the same direction, the combined ends being twisted approximately the same amount in the opposite direction to form a cabled yarn having a twist multiplier of between about 6 and 10.
Claim 3
Dependent Claim
21 words
The cord of claim 1 wherein the poly(p-phenyleneterephthalamide) continuous filament yarn is cabled with one end of continuous filament nylon yarn.
Claim 4
Dependent Claim
21 words
The cord of claim 1 wherein the poly(p-phenyleneterephthalamide) continuous filament yarn is cabled with one end of continuous filament polyester yarn.
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) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |