Patent US3851692A successfully refreshed from Google Patents.
US3851692A
Expired / Lapsed
US
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Pneumatic tires
Assignee: Bridgestone Corp
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Filing: 1973-12-21
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Granted: 1974-12-03
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Expires: 1993-12-21
Abstract
Abstract Pneumatic tires reinforced with a carcass and a breaker, said carcass being composed of polyester fiber or 6,6-nylon fiber cord layer and said breaker being composed of aromatic polyamide fiber cord layer having particularly defined tenacity, initial modulus and twisting coefficients of cable twist and ply twist and the rubber to embed the breaker having 300 percent modulus of 130 250 Kg/cm2.
Inventors
- 👤 S Takemura
- 👤 K Harakon
- 👤 M Maeda
- 👤 N Sakai
- 👤 E Hamano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:36
CPC Classifications
B; B60; B60C; B60C9/00; B60C9/02; B60C9/04; B60C9/08; B60C9/06; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10765; Y10T152/1081
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
121 words
PNEUMATIC TIRES REINFORCED WITH A CARCASS AND A BREAKER AND COMPRISING A TREAD PORTION A PAIR OF SIDE PORTIONS EXTENDING TO BOTH THE SHOULDERS OF THE TREAD PORTION AND A PAIR OF BEAD PORTIONS FORMED ON EACH INNER PERIPHERY OF THE SIDE PORTIONS CHARACTERIZED IN THAT SAID CARCASS IS COMPOSED OF POLYESTER FIBER OR 6,6-NYLON FIBER CORD LAYER AND SAID-BREAKER IS COMPOSED OF A LAYER WHEREIN 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
121 words
PNEUMATIC TIRES REINFORCED WITH A CARCASS AND A BREAKER AND COMPRISING A TREAD PORTION A PAIR OF SIDE PORTIONS EXTENDING TO BOTH THE SHOULDERS OF THE TREAD PORTION AND A PAIR OF BEAD PORTIONS FORMED ON EACH INNER PERIPHERY OF THE SIDE PORTIONS CHARACTERIZED IN THAT SAID CARCASS IS COMPOSED OF POLYESTER FIBER OR 6,6-NYLON FIBER CORD LAYER AND SAID-BREAKER IS COMPOSED OF A LAYER WHEREIN 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
42 words
The pneumatic tires as claimed in claim 1, wherein said aromatic polyamide fiber cords has a tenacity of more than 15 g/d, an initial modulus of more than 200 g/d and a twisting coefficient of the cable twist of 0.25 - 0.45.
Claim 4
Dependent Claim
27 words
The pneumatic tires as claimed in claim 1, wherein the rubber to embed the aromatic polyamide fiber cords has 300 percent modulus of 160 - 250 Kg/cm2.
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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 |