US3664402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tread for heavy-duty radial-carcass tire
Assignee: Compagnie Generale des Etablissements Michelin SCA
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Filing: 1970-06-15
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Granted: 1972-05-23
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Expires: 1990-06-15
Abstract
Abstract A tire tread formed with circumferential zigzag ribs bordered by circumferential zigzag grooves is characterized in that the lateral walls of the ribs have a variable inclination with respect to the perpendicular to the tread. The minimum inclination is close to and on the side of portions of the ribs that project with respect to the grooves, and the maximum inclination is close to and on the side of portions of the ribs that are re-entrant with respect to the grooves.
Inventors
- 👤 Jean B Montagne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:38
CPC Classifications
B; B60; B60C; B60C11/00; B60C11/03; B60C11/0306; B60C11/0309; B60C11/04; B60C11/042; B60C11/13; B60C11/1307; B60C11/1315; B60C11/1323
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
98 words
A tire comprising a tread formed with circumferential zigzag ribs bordered by circumferential zigzag grooves, characterized in that the lateral walls of the ribs are warped in such a manner as to have an inclination with respect to the perpendicular to the tread which varies as a function of circumferential position, said inclination being at a minimum close to and on the side of portions of the ribs that project with respect to the grooves and at a maximum close to and on the side of portions of the ribs that are re-entrant with respect to the grooves.
Claim 2
Dependent Claim
98 words
A tire comprising a tread formed with circumferential zigzag ribs bordered by circumferential zigzag grooves, characterized in that the lateral walls of the ribs are warped in such a manner as to have an inclination with respect to the perpendicular to the tread which varies as a function of circumferential position, said inclination being at a minimum close to and on the side of portions of the ribs that project with respect to the grooves and at a maximum close to and on the side of portions of the ribs that are re-entrant with respect to the grooves.
Claim 3
Dependent Claim
14 words
A tire according to claim 1 wherein the inclination varies from -10* to +30*.
Claim 4
Dependent Claim
28 words
A tire according to claim 1 wherein the transverse cross section of the grooves has a substantially constant area at all locations along the length of the grooves.
Claim 5
Dependent Claim
68 words
A tire according to claim 1 wherein the grooves at some locations between said projecting and re-entrant rib portions assume a symmetrical shape and wherein the transverse cross section of the grooves has an area at all locations along the length of the grooves of at least equal to the area of the transverse cross section of the grooves at locations where the grooves have a symmetrical shape.
Claim 6
Dependent Claim
26 words
A tire according to claim 1 wherein the zigzag ribs and grooves comprise segments each inclined with respect to the circumferential direction by 10* to 20*.
Claim 7
Dependent Claim
10 words
A tire according to claim 1 comprising a radial carcass.
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |