US3847698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic tires
Assignee: Dunlop Ltd
•
Filing: 1972-10-10
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Granted: 1974-11-12
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Expires: 1992-10-10
Abstract
Abstract A pneumatic tire provided with a tread pattern having at least one generally circumferentially extending groove having limbs of zig-zag plan form, wherein the base of the groove is of constant width, the width at the mouth of the groove adjacent to a junction is greater than the groove mouth width intermediate the junctions and the change from wider to narrower groove width is graduated so that there is a reduced tendency for the grooves to trap stones during use of the tire.
Inventors
- 👤 A Ravenhall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:17
CPC Classifications
B; B60; B60C; B60C11/00; B60C11/03; B60C11/04; B60C11/042; B60C11/0306; B60C11/0309; Y; Y10; Y10S; Y10S152/00; Y10S152/01; Y10S152/90
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
114 words
A pneumatic tire provided with a tread pattern having at least one generally circumferentially extending groove having limbs of substantially zig-zag or undulating plan form, a junction being formed between the ends of adjacent limbs, the width at the mouth of the groove adjacent to at least some of said junctions, at each end of at least some of said limbs, being greater than the groove mouth width intermediate at least some of said junctions, the change from wider to narrower width being graduated wherein each limb of the zig-zag groove has one wall which is substantially linear, when viewed in plan, and an opposed wall which is substantIally non-linear when viewed in plan.
Claim 2
Dependent Claim
114 words
A pneumatic tire provided with a tread pattern having at least one generally circumferentially extending groove having limbs of substantially zig-zag or undulating plan form, a junction being formed between the ends of adjacent limbs, the width at the mouth of the groove adjacent to at least some of said junctions, at each end of at least some of said limbs, being greater than the groove mouth width intermediate at least some of said junctions, the change from wider to narrower width being graduated wherein each limb of the zig-zag groove has one wall which is substantially linear, when viewed in plan, and an opposed wall which is substantIally non-linear when viewed in plan.
Claim 3
Dependent Claim
23 words
A pneumatic tire according to claim 1 wherein the wall which is substantially non-linear when viewed in plan comprises two mutually inclined faces.
Claim 4
Dependent Claim
17 words
A pneumatic tire according to claim 2 wherein the two mutually inclined faces are of unequal length.
Claim 5
Dependent Claim
27 words
A pneumatic tire according to claim 3 wherein the included angle between the two mutually inclined faces of unequal length is of the order of 170* .
Claim 6
Dependent Claim
103 words
A tread pattern for a pneumatic tire having at least one generally circumferentially extending groove, said groove being defined by a plurality of limbs of substantially zig-zag or undulating plan form, each said limb having a pair of walls, wherein a junction is formed between the walls at the ends of adjacent limbs, said groove having a mouth width at several of said junctions which is greater than the groove mouth width at a point intermediate two adjacent junctions, wherein the change from wider to narrower width is graduated, the groove having a base of constant width around the circumference of the tire.
Claim 7
Dependent Claim
103 words
A tread pattern for a pneumatic tire having at least one generally circumferentially extending groove, said groove being defined by a plurality of limbs of substantially zig-zag or undulating plan form, each said limb having a pair of walls, wherein a junction is formed between the walls at the ends of adjacent limbs, said groove having a mouth width at several of said junctions which is greater than the groove mouth width at a point intermediate two adjacent junctions, wherein the change from wider to narrower width is graduated, the groove having a base of constant width around the circumference of the tire.
Claim 8
Dependent Claim
20 words
A tread pattern according to claim 5 wherein the mouth of the groove is of maximum width at said junctions.
Claim 9
Dependent Claim
15 words
A tread pattern according to claim 5 wherein the groove cross-section is substantially of V-form.
Claim 10
Dependent Claim
31 words
A tread pattern according to claim 5 wherein one wall of each limb is substantially linear, when viewed in plan, and the other wall is substantially non-linear when viewed in plan.
Claim 11
Dependent Claim
23 words
A tread pattern according to claim 8 wherein the wall which is substantially non-linear when viewed in plan comprises two mutually inclined faces.
Claim 12
Dependent Claim
17 words
A tread pattern according to claim 9 wherein the two mutually inclined faces are of unequal length.
Claim 13
Dependent Claim
27 words
A tread pattern according to claim 10 wherein the included angle between the two mutually inclined faces of unequal length is of the order of 170* .
Claim 14
Dependent Claim
48 words
A tread pattern according to claim 5 wherein the increase in width from the narrowest point of each groove mouth to the widest point of each groove mouth measured at the ground-contacting surface of the tire in the unworn condition thereof lies between 10 percent to 25 percent.
References Cited (Backward Citations)
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Cited
US2298033A
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US2604920A
Cited
US2843172A
Cited
US3095024A
Cited
US3556191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |