US3841374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tires
Assignee: Compagnie Generale des Etablissements Michelin SCA
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Filing: 1973-03-23
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Granted: 1974-10-15
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Expires: 1993-03-23
Abstract
Abstract Delivery truck tires capable of operating at high speeds and under heavy loads and having the properties of good adherence to wet roads, cornering performance, wear resistance and drainage of the tread are achieved by means of a tread design which presents a pronounced pressure gradient on the road by virtue of having circumferential ribs with a rigid central zone and flexible lateral zones.
Inventors
- 👤 J 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; B60C11/03; B60C11/0306; B60C2011/0337; B60C2011/0339; B60C2011/0381; B60C2011/0383; B60C11/12; B60C11/1204; B60C2011/1213; B60C2200/00; B60C2200/06; Y; Y10; Y10S; Y10S152/00; Y10S152/90
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
166 words
In a tire for delivery trucks whose tread is composed of a plurality of continuous circumferential ribs separated from each other by relatively wide zigzag circumferential grooves, said ribs being cut transversely by relatively narrow blind grooves debouching into the zigzag circumferential grooves and being cut by thin, deep lamellae, the improvement which comprises the transverse grooves and the lamellae being located on the borders of the circumferential ribs so as to define in each circumferential rib a central zone of a transverse width of between one-quarter and one-half of the transverse width of the rib and which central zone is not cut in depth and accordingly is rigid, and the transverse grooves which debouch into the zigzag circumferential grooves having a flared shape and their edges form angles with the circumferential direction which are definitely greater than the angles of the edges of the zigzag circumferential grooves and accordingly favoring the mobility of the borders of the ribs and the drainage of their entire surface.
Claim 2
Dependent Claim
166 words
In a tire for delivery trucks whose tread is composed of a plurality of continuous circumferential ribs separated from each other by relatively wide zigzag circumferential grooves, said ribs being cut transversely by relatively narrow blind grooves debouching into the zigzag circumferential grooves and being cut by thin, deep lamellae, the improvement which comprises the transverse grooves and the lamellae being located on the borders of the circumferential ribs so as to define in each circumferential rib a central zone of a transverse width of between one-quarter and one-half of the transverse width of the rib and which central zone is not cut in depth and accordingly is rigid, and the transverse grooves which debouch into the zigzag circumferential grooves having a flared shape and their edges form angles with the circumferential direction which are definitely greater than the angles of the edges of the zigzag circumferential grooves and accordingly favoring the mobility of the borders of the ribs and the drainage of their entire surface.
Claim 3
Dependent Claim
46 words
The tire defined by claim 1 wherein the transverse grooves are arranged obliquely at least over a portion of their length and the direction of the transverse grooves is approximately perpendicular to one of the directions of the segments forming the zigzags of the circumferential grooves.
Claim 4
Dependent Claim
26 words
The tire defined by claim 1 wherein the divergent edges of the transverse grooves intersect the edges of the circumferential grooves approximately at a right angle.
Claim 5
Dependent Claim
54 words
The tire defined by claim 1 wherein the transverse grooves debouching into the same circumferential groove have parallel orientatiOns, while those which intersect the edges of the same circumferential rib have symmetrical orientations, the said transverse grooves debouching in the same circumferential groove or intersecting the same circumferential rib being staggered in circumferential direction.
Claim 6
Dependent Claim
25 words
The tire defined by claim 1 wherein the transverse grooves have maximum and minimum widths which are in a ratio of between 2:1 and 5:1.
Claim 7
Dependent Claim
33 words
The tire defined by claim 1 wherein the transverse grooves cut the tips of the circumferential ribs and have a length which is at least equal to the width of the circumferential grooves.
Claim 8
Dependent Claim
29 words
The tire defined by claim 1 wherein the transverse grooves cut the hollows of the circumferential ribs and have a length less than the width of the circumferential grooves.
Claim 9
Dependent Claim
47 words
The tire defined by claim 1 wherein there are four circumferential ribs and three circumferential grooves, the lateral circumferential ribs being wider than the central circumferential ribs and the circumferential grooves being identical and occupying a total of about 20 percent of the width of the tread.
Claim 10
Dependent Claim
18 words
The tire defined by claim 1 wherein the lamellae are arranged approximately parallel to the zigzag circumferential grooves.
Claim 11
Dependent Claim
47 words
The tire defined by claim 1 wherein there are five circumferential ribs and four circumferential grooves, the lateral circumferential ribs being wider than the central circumferential ribs and the circumferential grooves being identical and occupying a total of about 20 percent of the width of the tread.
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |