US3707177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tire tread with variable-width recesses
Assignee: Compagnie Generale des Etablissements Michelin SCA
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Filing: 1971-01-19
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Granted: 1972-12-26
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Expires: 1991-01-19
Abstract
Abstract A pneumatic tire is provided with a tread whose recessed portions have a width that decreases from the surface of the tread towards the axis of the tire. The recessed portions have a greater variation of width as a function of depth at the edges than in the central part of the tread.
Inventors
- 👤 Jacques Boileau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:38
CPC Classifications
B; B60; B60C; B60C11/00; B60C11/14; B60C11/16; B60C11/1625; B60C11/03; B60C11/0306; B60C11/0309; B60C11/11; B60C2011/0337; B60C2011/0386; B60C2011/0388; B60C11/12; B60C11/1204; B60C2011/1213; B60C11/1236; B60C2011/1254; Y; Y10; Y10S; Y10S152/00; Y10S152/901; Y10S152/902
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
113 words
A pneumatic tire initially suitable for use as a snow tire and, as it wears, for use as a summer tire, said tire comprising a tread, said tread having distributed thereover relief elements defIning recesses, the bottoms of said recesses having substantially the same width in all portions of said tread, and the tops of said recesses having substantially greater width near the edges of said tread than in the center of said tread, whereby the decrease in groove width at the tread surface as said tread wears is not uniform over the area of said tread but substantially greater near the edges of said tread than in the center of said tread.
Claim 2
Dependent Claim
113 words
A pneumatic tire initially suitable for use as a snow tire and, as it wears, for use as a summer tire, said tire comprising a tread, said tread having distributed thereover relief elements defIning recesses, the bottoms of said recesses having substantially the same width in all portions of said tread, and the tops of said recesses having substantially greater width near the edges of said tread than in the center of said tread, whereby the decrease in groove width at the tread surface as said tread wears is not uniform over the area of said tread but substantially greater near the edges of said tread than in the center of said tread.
Claim 3
Dependent Claim
57 words
A tire according to claim 1 wherein the ratio of the width of said recesses at the tread surface when new to the width of said recesses 2 mm from the bottom thereof exceeds 3 at the edges of the tread and is within the range of 1 to 3 in the central portion of the tread.
Claim 4
Dependent Claim
39 words
A tire according to claim 1 wherein the tread when new has a cutout percentage at the surface thereof within the range of 40 to 75 percent, said cutout percentage decreasing to about 30 percent as the tread wears.
Claim 5
Dependent Claim
32 words
A tire according to claim 1 wherein said relief elements and said recesses have a generally transverse orientation at said edges and an orientation other than generally transverse in said central portion.
References Cited (Backward Citations)
US2779378A
Cited
US3512567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |