US3861439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-weight heavy-duty radial tire
Assignee: Compagnie Generale des Etablissements Michelin SCA
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Filing: 1972-12-15
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Granted: 1975-01-21
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Expires: 1992-12-15
Abstract
Abstract A light-weight heavy-duty radial tire is formed with at least one carcass ply and at least two tread plies. The tensile strength T, expressed in kilograms, of the plies per centimeter of ply width is reduced to a value between 5 and 15 times the inner radius R, expressed in centimeters, of the tire in the median plane. The tire is of substantially reduced weight and is inflated to a pressure which is 20% to 30% less than the nominal inflation pressure for conventional tires of the same size bearing the same load.
Inventors
- 👤 Jacques Boileau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:36
CPC Classifications
B; B60; B60C; B60C9/00; B60C9/0007; B60C11/00; B60C11/03; B60C11/0306; B60C11/0309; B60C11/04; B60C11/042; B60C15/00; B60C15/0009; B60C15/0036; B60C15/0045; B60C9/0042; B60C9/02; B60C9/04; B60C9/08; B60C9/18; B60C9/28; B60C11/0008; B60C2011/0016; B60C2011/0033; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10855; Y10T152/10864
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
122 words
A light-weight heavy-duty radial tire comprising a tread, a radial carcass formed of at least one carcass ply of cords, and a tread reinforcement formed of at least two tread plies of cords, said cords of said carcass and tread reinforcement being laid in different directions, each separate direction of cords correspoNding to a single standard ply or a plurality of submultiple plies equivalent in combination to one standard ply, and the tensile strength T, expressed in kilograms, per centimeter of ply width of at least one of said standard plies being between 5 and 15 times the inner radius R, expressed in centimeters, of the tire in the median plane, the tire being in an inflated condition but not under load.
Claim 2
Dependent Claim
122 words
A light-weight heavy-duty radial tire comprising a tread, a radial carcass formed of at least one carcass ply of cords, and a tread reinforcement formed of at least two tread plies of cords, said cords of said carcass and tread reinforcement being laid in different directions, each separate direction of cords correspoNding to a single standard ply or a plurality of submultiple plies equivalent in combination to one standard ply, and the tensile strength T, expressed in kilograms, per centimeter of ply width of at least one of said standard plies being between 5 and 15 times the inner radius R, expressed in centimeters, of the tire in the median plane, the tire being in an inflated condition but not under load.
Claim 3
Dependent Claim
19 words
A tire according to claim 1, wherein said carcass ply consists essentially of a single ply of steel cords.
Claim 4
Dependent Claim
21 words
A tire according to claim 1, wherein said carcass ply consists essentially of a single ply of cords of synthetic material.
Claim 5
Dependent Claim
40 words
A tire according to claim 1, wherein the tire further comprises a pair of beads and, in each bead, bead wires comprising three elements tangent in pairs, said carcass having an edge turned around the bead wire in each bead.
Claim 6
Dependent Claim
57 words
A tire according to claim 1, wherein the tire further comprises a pair of side walls respectively terminating in a pair of beads and, in each bead, a bead wire, said carcass having a portion turned around the bead wire in each bead and doubled back in each side wall over at least one-third the height thereof.
Claim 7
Dependent Claim
43 words
A tire according to claim 5, wherein said doubled-back portions are laid along paths that are locally longer than those of the carcass proper, so that each doubled-back portion has, as compared to the adjacent portion of the carcass proper, a reserve length.
Claim 8
Dependent Claim
28 words
A tire according to claim 6, wherein said carcass ply is made of very elastic cords and wherein each doubled-back portion extends to a location beneath the tread.
Claim 9
Dependent Claim
41 words
A tire according to claim 1, further comprising a bonding rubber interposed between the carcass and the edges of the tread reinforcement, said bonding rubber forming a layer having a thickness between one-half and twice the thickness of one reinforcement ply.
Claim 10
Dependent Claim
34 words
A tire according to claim 1, wherein the tread is formed with grooves having a depth which prior to wear of the tread is equal to substantially three-quarters of the thickness of the tread.
Claim 11
Dependent Claim
24 words
A tire according to claim 1, wherein the tread reinforcement has a thickness at least as great as one-fourth the thickness of the tread.
Claim 12
Dependent Claim
32 words
A tire according to claim 1 inflated to a pressure which is 20 to 30 percent less than the nominal inflation pressure for tires of the same size bearing the same load.
References Cited (Backward Citations)
US2493614A
Cited
US2939502A
Cited
US3509929A
Cited
US3709276A
Cited
US3736974A
Cited
US3735791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |