US3851693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radial tire
Assignee: Bridgestone Corp
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Filing: 1973-12-18
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Granted: 1974-12-03
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Expires: 1993-12-18
Abstract
Abstract A radial tire using a composite layer composed of a steel cord layer and an aromatic polyamide fiber cord layer as a breaker. The radial tire is excellent in the corrosion resistance, cushionability, tread wear resistance, high speed performance and cornering performance.
Inventors
- 👤 S Takemura
- 👤 K Harakon
- 👤 E Hamano
- 👤 M Maeda
- 👤 N Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:03
CPC Classifications
B; B60; B60C; B60C9/00; B60C9/0042; B60C9/18; B60C9/20; B60C9/2003; B60C9/2009; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10765; Y10T152/10792; Y10T152/1081
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
169 words
A RADIAL TIRE REINFORCED WITH A CARACASS HAVING CORDS ARRANGED IN A DIRECTION PERPENDICULAR TO THE CIRCUMFERENTIAL DIRECTION OF THE TIRE AND WITH A BREAKER SURROUNDING THE CARCASS, AND HAVING A THREAD PORTION, A PAIR OF SIDE PORTIONS EXTEND ING TO BOTH THE SHOULDERS OF THE THREAD PORTION AND A PAIR OF BEAD PORTIONS FORMED ON EACH INNER PERIPHERY OF THE SIDE PORTIONS, CHARACTERIZED IN THAT SAID BREAKER IS COMPOSED OF A COMPOSITE LAYER CONSISTING OF A METAL CORD LAYER, IN WHICH STEEL CORDS ARE EMBEDDED IN PARALLEL IN A RUBBER HAVING A 300 PERCENT MODULUS OF 150-250 KG/CM2 AT AN ANGLE OF 5*-25* AGAINST THE CIRCUMFERENTIAL DIRECTION OF THE TIRE, AND A FIBER CORD LAYER, IN WHICH AROMATIC POLYAMIDE FIBER CORDS HAVING A TENACITY OF MORE THAN 10 G/D, AN INITIAL MODULUS OF MORE THAN 150 G/D AND A TWISTING COEFFICIENT OF CABLE TWIST OF 0.10-0.60 AND THAT OF PLY TWIST OF 100-200 PERCENT BASED ON THE CABLE TWIST, SAID TWISTING COEFFICIENT BEING REPRESENTED BY THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
169 words
A RADIAL TIRE REINFORCED WITH A CARACASS HAVING CORDS ARRANGED IN A DIRECTION PERPENDICULAR TO THE CIRCUMFERENTIAL DIRECTION OF THE TIRE AND WITH A BREAKER SURROUNDING THE CARCASS, AND HAVING A THREAD PORTION, A PAIR OF SIDE PORTIONS EXTEND ING TO BOTH THE SHOULDERS OF THE THREAD PORTION AND A PAIR OF BEAD PORTIONS FORMED ON EACH INNER PERIPHERY OF THE SIDE PORTIONS, CHARACTERIZED IN THAT SAID BREAKER IS COMPOSED OF A COMPOSITE LAYER CONSISTING OF A METAL CORD LAYER, IN WHICH STEEL CORDS ARE EMBEDDED IN PARALLEL IN A RUBBER HAVING A 300 PERCENT MODULUS OF 150-250 KG/CM2 AT AN ANGLE OF 5*-25* AGAINST THE CIRCUMFERENTIAL DIRECTION OF THE TIRE, AND A FIBER CORD LAYER, IN WHICH AROMATIC POLYAMIDE FIBER CORDS HAVING A TENACITY OF MORE THAN 10 G/D, AN INITIAL MODULUS OF MORE THAN 150 G/D AND A TWISTING COEFFICIENT OF CABLE TWIST OF 0.10-0.60 AND THAT OF PLY TWIST OF 100-200 PERCENT BASED ON THE CABLE TWIST, SAID TWISTING COEFFICIENT BEING REPRESENTED BY THE FOLLOWING FORMULA:
Claim 3
Dependent Claim
41 words
The radial tire as claimed in claim 1, wherein the aromatic polyamide fiber cord has a tenacity of more than 15 g/d, an initial modulus of more than 200 g/d and the twisting coefficient of cable twist is 0.25 - 0.45.
Claim 4
Dependent Claim
28 words
The radial tire as claimed in claim 1, wherein the rubber for embedding the aromatic polyamide fiber cords has a 300 percent modulus of 160 - 250 Kg/cm2.
References Cited (Backward Citations)
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US3669173A
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US3554260A
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US3692080A
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US3627013A
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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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |