Patent US4934431A successfully refreshed from Google Patents.
US4934431A
Expired / Lapsed
US
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Radial tires for automobiles having carbon fiber cord bead reinforcing layer
Assignee: Yokohama Rubber Co Ltd
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Filing: 1987-08-19
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Granted: 1990-06-19
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Expires: 2007-08-19
Abstract
Abstract A radial tire for an automobile having along each bead a reinforcing layer formed by cords of carbon fibers.
Inventors
- 👤 Atsunori Agari
- 👤 Ryoji Hanada
- 👤 Shuuji Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:57
CPC Classifications
B; B60; B60C; B60C15/00; B60C15/06; B60C15/0628; B60C2015/0639; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10819; Y10T152/10828; Y10T152/10846
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
142 words
A high-speed radial tire for a passenger automobile, which has a bead portion including a bead filler disposed on a bead wire, a carcass layer folded around said bead wire from the inner side of the tire to the outer side of the tire so as to wrap around said bead filler, and a reinforcing layer disposed between the outer side of the folded-around carcass layer and the outer side of the tire, the reinforcing layer comprising carbon fiber cords in a coating rubber having a 100% modulus within the range of 30 to 70 kg/cm 2 and having a number of 20 to 60 cords per 5 cm of the coating rubber, said carbon fiber cords in the reinforcing layer being crossed with cords in a carcass layer of the tire at an angle within the range of 20° to 70°.
Claim 2
Dependent Claim
142 words
A high-speed radial tire for a passenger automobile, which has a bead portion including a bead filler disposed on a bead wire, a carcass layer folded around said bead wire from the inner side of the tire to the outer side of the tire so as to wrap around said bead filler, and a reinforcing layer disposed between the outer side of the folded-around carcass layer and the outer side of the tire, the reinforcing layer comprising carbon fiber cords in a coating rubber having a 100% modulus within the range of 30 to 70 kg/cm 2 and having a number of 20 to 60 cords per 5 cm of the coating rubber, said carbon fiber cords in the reinforcing layer being crossed with cords in a carcass layer of the tire at an angle within the range of 20° to 70°.
Claim 3
Dependent Claim
108 words
A radial tire as set forth in claim 1, wherein said carbon fibers have a tensile strength of at least 100 kg/mm 2 and a modulus in tension of at least 5000 kg/mm 2 and said cords of carbon fibers are obtained by applying 10 to 50% of an adhesive to said carbon fibers based on the weight thereof per unit length and twisting said fibers to the extent that the coefficient of twist K expressed by the following formula may be in the range of 0 to 1800, inclusive: ##EQU2## where K: coefficient of twist, T: Number of twist (turns/10 cm), and D: Total denier of cord.
Claim 4
Dependent Claim
28 words
A radial tire as set forth in claim 2, wherein said adhesive is a mixed solution prepared from a recondensate of resorcin and formalin and a rubber latex.
Claim 5
Dependent Claim
24 words
A radial tire as set forth in claim 2, wherein said coefficient of twist K is in the range of 300 to 1500, inclusive.
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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) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |