Patent US3929180A successfully refreshed from Google Patents.
US3929180A
Expired / Lapsed
US
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Tyres
Assignee: Teijin Ltd
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Filing: 1974-09-16
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Granted: 1975-12-30
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Expires: 1994-09-16
Abstract
Abstract The reinforced tyre which is characterized in that its carcass material consists of the cord composed substantially of polyethylene 2,6-naphthalate, said cord, as set in the tyre, having the twisting coefficient, K-value, of 1600 to 3300, the modulus under 2% extension of 40 - 160 g/denier, and the dry heat shrinkage of no greater than 3% when exposed to the temperature of 150*C. for 30 minutes, with the definition of K as below: K T square root D in which T denotes the number of folded twist per 10 cm of the cord, and D denotes the total denier of the filaments constituting the cord.
Inventors
- 👤 Shoji Kawase
- 👤 Kenji Maeda
- 👤 Shiro Kumakawa
- 👤 Takatoshi Kuratsuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:07
CPC Classifications
B; B60; B60C; B60C9/00; B60C9/02; B60C9/04; B60C9/08; B60C9/0042; Y; Y10; Y10S; Y10S57/00; Y10S57/902
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A REINFORCED TYRE WHICH IS CHARACTERIZED IN THAT ITS CARCASS MATERIAL CONSISTS OF A CORD COMPOSED SUBSTANTIALLY OF POLYETHYLENE 2,6-NAPHTHALATE, SAID CORD, AS SET IN A TYRE, HAVING A TWISTING COEFFICIENT K-VALUE OF 1600 TO 3300, A MODULUS UNDER 2% EXTENSION OF 40 - 160 G/DENIER, AND A DRY HEAT SHRINKAGE OF NO GREATER THAN 3% WHEN EXPOSED TO THE TEMPERATURE OF 150*C. FOR 30 MINUTES, WITH THE DEFINITION OF K AS BELOW K=TVD IN WHICH T DENOTES THE NUMBER OF FOLDED TWIST PER 10 CM OF THE CORD, AND D DENOTES THE TOTAL DENIER OF THE FILAMENTS CONSITUTING THE CORD.
Claim 2
Dependent Claim
101 words
A REINFORCED TYRE WHICH IS CHARACTERIZED IN THAT ITS CARCASS MATERIAL CONSISTS OF A CORD COMPOSED SUBSTANTIALLY OF POLYETHYLENE 2,6-NAPHTHALATE, SAID CORD, AS SET IN A TYRE, HAVING A TWISTING COEFFICIENT K-VALUE OF 1600 TO 3300, A MODULUS UNDER 2% EXTENSION OF 40 - 160 G/DENIER, AND A DRY HEAT SHRINKAGE OF NO GREATER THAN 3% WHEN EXPOSED TO THE TEMPERATURE OF 150*C. FOR 30 MINUTES, WITH THE DEFINITION OF K AS BELOW K=TVD IN WHICH T DENOTES THE NUMBER OF FOLDED TWIST PER 10 CM OF THE CORD, AND D DENOTES THE TOTAL DENIER OF THE FILAMENTS CONSITUTING THE CORD.
Claim 3
Dependent Claim
18 words
The tyre of claim 1, in which the cord has the twisting coefficient, K-value, of 1800 - 2500.
Claim 4
Dependent Claim
20 words
The tyre of claim 1, in which the cord has the modulus under 2% extension of 60 - 150 g/denier.
Claim 5
Dependent Claim
29 words
The tyre of claim 1, in which the cord shows the dry heat shrinkage, upon exposure to the temperature of 150*C. for 30 minutes, of no greater than 2.5%.
Claim 6
Dependent Claim
19 words
The tyre of claim 1, in which the tyre is any of bias tyre, bias-belted tyre and radial tyre.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |