US3674077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tire tread
Assignee: Compagnie Generale des Etablissements Michelin SCA
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Filing: 1970-07-20
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Granted: 1972-07-04
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Expires: 1990-07-20
Abstract
Abstract The tread of a pneumatic tire is formed with symmetrical grooves, preferably S-shaped, extending from one edge of the tread to the other. The grooves are generally longitudinal in the central portion of the tread and generally transverse near the edges of the tread.
Inventors
- 👤 Henri Verdier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:54
CPC Classifications
B; B60; B60C; B60C11/00; B60C11/03; B60C11/0311; B60C2011/0337; B60C2011/0339; B60C2011/0374; B60C11/12; B60C11/1204; B60C2011/1213; B60C11/1236; B60C2011/1254; Y; Y10; Y10S; Y10S152/00; Y10S152/902; Y10S152/903
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
119 words
A pneumatic tire comprising a tread formed with a set of grooves extending from one edge of the tread to the other and being repeated all around the tread in accordance with a single pattern, said grooves defining zones in relief bounded by adjacent grooves and also repeated all around the tread in accordance with a single pattern, said grooves and said zones in relief undergoing a gradual change in direction from one edge of the tread to the other without discontinuity when crossing the center line of the tread and forming with the longitudinal direction of the tire an angle that increases with increasing distance from the center line of the tread towards each edge of the tread.
Claim 2
Dependent Claim
119 words
A pneumatic tire comprising a tread formed with a set of grooves extending from one edge of the tread to the other and being repeated all around the tread in accordance with a single pattern, said grooves defining zones in relief bounded by adjacent grooves and also repeated all around the tread in accordance with a single pattern, said grooves and said zones in relief undergoing a gradual change in direction from one edge of the tread to the other without discontinuity when crossing the center line of the tread and forming with the longitudinal direction of the tire an angle that increases with increasing distance from the center line of the tread towards each edge of the tread.
Claim 3
Dependent Claim
12 words
A pneumatic tire according to claim 1 wherein said grooves are S-shaped.
Claim 4
Dependent Claim
39 words
A pneumatic tire according to claim 1 wherein said grooves form an angle with the longitudinal direction of the tire of substantially 90* at the edges of the tread and less than 30* at the center of the tread.
Claim 5
Dependent Claim
36 words
A pneumatic tire according to claim 1 wherein the length of one of said grooves is within the range of one-half to twice the longitudinal length of the tire imprint on flat ground under normal load.
Claim 6
Dependent Claim
52 words
A pneumatic tire according to claim 1 wherein Q/sin Alpha is a constant or increases from the center of the tread towards each edge, where Q is the cross-sectional area of one of said grooves and Alpha is the inclination of the groove with respect to the longitudinal direction of the tread.
Claim 7
Dependent Claim
51 words
A pneumatic tire according to claim 1 wherein L/sin Alpha is a constant or increases from the center of the tread towards each edge, where L is the width of one of said grooves and Alpha is the inclination of the groove with respect to the longitudinal direction of the tread.
Claim 8
Dependent Claim
22 words
A pneumatic tire according to claim 1 wherein each groove is formed of from five to nine segments, each segment being straight.
Claim 9
Dependent Claim
24 words
A pneumatic tire according to claim 1 further comprising short grooves in the central portion of the tread connecting the grooves of said set.
Claim 10
Dependent Claim
29 words
A pneumatic tire according to claim 1 comprising a circumferential groove at at least one edge of the tread, the grooves of said set opening into the circumferential groove.
References Cited (Backward Citations)
US1946209A
Cited
US3196920A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |