US4299264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tires
Assignee: BTR Industries Ltd
•
Filing: 1980-04-08
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Granted: 1981-11-10
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Expires: 2000-04-08
Abstract
Abstract A tread for a road vehicle tire having a pattern having a land-to-sea ratio between 65% to 35% and 75% to 25% and a series of diagonally extending grooves, the axially inner ends of which enter the contact patch between tread and ground before the remaining part of the groove in forward movement of the vehicle.
Inventors
- 👤 Arthur R. Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:04
CPC Classifications
B; B60; B60C; B60C11/00; B60C11/03; B60C11/0306; B60C11/0309; B60C11/0302; B60C11/0304; B60C11/0327; B60C11/033; B60C2011/0337; B60C2011/0386; B60C2011/0388; B60C11/12; B60C11/1204; B60C2011/1213; B60C11/1236; B60C2011/1254; Y; Y10; Y10S; Y10S152/00; Y10S152/03; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10765
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
124 words
A unidirectional tread for a road vehicle tire having a pattern with an overall "land to sea ratio" (as defined herein) between 65% to 35% and 75% to 25% and comprising at each side of the centreline of the tread a plurality of circumferentially spaced apart lateral grooves, every lateral groove extending outwardly at an angle between 30° and 70° to the centreline and the axially inward end of every lateral groove being behind the remainder of the groove in the contact patch so that in use of the tire on a road vehicle when the vehicle is moving forwards the axially inner end of a groove enters the contact patch between road and tire first, the remainder of the groove entering progressively afterwards.
Claim 2
Dependent Claim
124 words
A unidirectional tread for a road vehicle tire having a pattern with an overall "land to sea ratio" (as defined herein) between 65% to 35% and 75% to 25% and comprising at each side of the centreline of the tread a plurality of circumferentially spaced apart lateral grooves, every lateral groove extending outwardly at an angle between 30° and 70° to the centreline and the axially inward end of every lateral groove being behind the remainder of the groove in the contact patch so that in use of the tire on a road vehicle when the vehicle is moving forwards the axially inner end of a groove enters the contact patch between road and tire first, the remainder of the groove entering progressively afterwards.
Claim 3
Dependent Claim
36 words
A tread according to claim 1 wherein the minimum "land" area (as defined herein) in a central region, symmetrical relative to the tread centreline and extending 8 to 10% of the axial tread width, is 65%.
Claim 4
Dependent Claim
36 words
A tread according to claim 1 wherein the minimum "land" area (as defined herein) in an intermediate region, symmetrical relative to the tread centreline and extending 8 to 20% of the axial tread width, is 80%.
Claim 5
Dependent Claim
36 words
A tread according to claim 1, wherein the minimum "land" area (as defined herein) in the shoulder region, symmetrical relative to the tread centreline and extending 20 to 50% of the axial tread width, is 67%.
Claim 6
Dependent Claim
27 words
A tread according to claim 1 wherein the axial width of the "land" area increases from the central region to the intermediate region to the shoulder region.
Claim 7
Dependent Claim
31 words
A tread according to claim 5 wherein the axial width of the "land" area increases from the central region to the intermediate region to the shoulder region in the ratio 1:1.6:2.0.
Claim 8
Dependent Claim
30 words
A tread according to claim 1 wherein each lateral groove extends to the edge of the contact patch which is at or adjacent to the shoulder region of the tire.
Claim 9
Dependent Claim
21 words
A tread according to claim 1 wherein each lateral groove is open at the axially outer edge of the tire tread.
Claim 10
Dependent Claim
12 words
A tread according to claim 1 wherein each lateral groove is continuous.
Claim 11
Dependent Claim
18 words
A tread according to claim 1 wherein each lateral groove is made up of sections in end-to-end relationship.
Claim 12
Dependent Claim
21 words
A tread according to claim 1 wherein the lateral groove extends at a constant angle to the circumference over its length.
Claim 13
Dependent Claim
21 words
A tread according to claim 1 wherein the lateral groove extends at a varying angle to the circumference over its length.
Claim 14
Dependent Claim
27 words
A tread according to claim 1 wherein each lateral groove extends axially outwards at an angle in the range of 50° to 70° to the tread centreline.
Claim 15
Dependent Claim
39 words
A tread according to claim 1 wherein the groove angle changes from 45° in the intermediate region (as defined herein) to 60° in the shoulder region (as defined herein) each angle being measured with respect to the tread centreline.
Claim 16
Dependent Claim
22 words
A tread according to claim 1 wherein the lateral grooves are of constant width measured perpendicular to the centreline of the groove.
Claim 17
Dependent Claim
20 words
A tread according to claim 1 wherein the width of the lateral grooves increases towards the shoulders of the tire.
Claim 18
Dependent Claim
43 words
A tread according to claim 16 wherein the groove width measured perpendicular to the centreline of groove is between 2 and 4 mm in the central region of the tread and between 3 and 6 mm in the shoulder region of the tread.
Claim 19
Dependent Claim
28 words
A tread according to claim 1 wherein circumferential grooves are provided, the width of each one of these increasing from the central region (as defined herein) axially outwards.
Claim 20
Dependent Claim
36 words
A tread according to claim 18 wherein the ratio of the width of a circumferential groove in the central shoulder region (as defined herein) to the width of a circumferential groove in the region is 1:1.4.
Claim 21
Dependent Claim
26 words
A tread according to claim 1 wherein the circumferential spacing of the lateral grooves is such that at least three grooves are within the contact patch.
Claim 22
Dependent Claim
24 words
A tread according to claim 1 wherein the circumferential spacing of the lateral grooves is such that five grooves are within the contact patch.
Claim 23
Dependent Claim
18 words
A tread according to claim 1 wherein slots having a definite volumetric capacity are provided in the tread.
Claim 24
Dependent Claim
11 words
A tread according to claim 22 wherein the slots extend circumferentially.
Claim 25
Dependent Claim
11 words
A tread according to claim 22 wherein the slots are open-ended.
Claim 26
Dependent Claim
22 words
A tread according to claim 1 wherein the edge of a tread groove extends at 70° with respect to the tread surface.
Claim 27
Dependent Claim
13 words
A tread according to claim 1 wherein a straight circumferential groove is provided.
Claim 28
Dependent Claim
30 words
A tread according to claim 1 wherein a circumferential groove having a sidewall which is slightly angled to the circumference to promote water flow into a lateral groove is provided.
Claim 29
Dependent Claim
49 words
A tread according to claim 27 wherein the axially inner sidewalls of the circumferential groove is in the form of a shallow sawtooth with an axially outward projecting apex a small distance in front of the entry to each lateral groove to encourage water to enter said lateral groove.
Claim 30
Dependent Claim
9 words
A tire having a tread according to claim 1.
Claim 31
Dependent Claim
19 words
A pneumatic tire having a breaker structure designed to stiffen the tread having a tread according to claim 1.
Claim 32
Dependent Claim
13 words
A pneumatic tire according to claim 30 which is a radial ply tire.
Claim 33
Dependent Claim
23 words
A tread according to claim 1, wherein the minimum "land" area (as defined herein) in the central region (as defined herein) is 64.8%.
Claim 34
Dependent Claim
23 words
A tread according to claim 1, wherein the minimum "land" area (as defined herein) in the intermediate region (as defined herein) is 61.3%.
Claim 35
Dependent Claim
22 words
A tread according to claim 1, wherein the "land" area (as defined herein) in the intermediate region (as defined herein) is 77.4%.
Claim 36
Dependent Claim
23 words
A tread according to claim 1, wherein the minimum "land" area (as defined herein) in the shoulder region (as defined herein) is 63.5%.
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) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |