US3578055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tread wear indicator
Assignee: Dunlop Co Ltd
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Filing: 1968-10-11
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Granted: 1971-05-11
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Expires: 1988-10-11
Abstract
Abstract A pneumatic tire having a recess formed in the tread rubber thereof by cutting or moulding a recess shoulder portion formed in the rubber bounding the recess, and a tread wear marker located in the recess having at least a part thereof located radially inwardly of the said shoulder portion and secured in position thereby, the marker comprising, at least in part, material which may be distinguished either visually or audibly upon rotation of the tire on a hard surface for indicating a degree of tread wear which has occurred in the rubber adjacent the marker.
Inventors
- 👤 Tom French
- 👤 Vernon E Gough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:41
CPC Classifications
B; B60; B60C; B60C11/00; B60C11/24; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10027
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
105 words
A pneumatic tire having a radially inwardly extending recess formed in the tread rubber thereof, the extremity of the recess away from the ground contacting surface of the tire opening into a chamber of enlarged cross-sectional area and providing a shoulder portion, a tread wear marker located in the chamber radially inwardly of the shoulder portion and maintained in position thereby, the marker comprising at least in part a distinguishable material for indicating a degree of tread wear which has occurred in the rubber adjacent to the marker, the wall of the recess above the shoulder taPering gradually outwardly to the surface of the tire.
Claim 2
Dependent Claim
105 words
A pneumatic tire having a radially inwardly extending recess formed in the tread rubber thereof, the extremity of the recess away from the ground contacting surface of the tire opening into a chamber of enlarged cross-sectional area and providing a shoulder portion, a tread wear marker located in the chamber radially inwardly of the shoulder portion and maintained in position thereby, the marker comprising at least in part a distinguishable material for indicating a degree of tread wear which has occurred in the rubber adjacent to the marker, the wall of the recess above the shoulder taPering gradually outwardly to the surface of the tire.
Claim 3
Dependent Claim
12 words
A pneumatic tire according to claim 1, wherein the marker is disc-shaped.
Claim 4
Dependent Claim
16 words
The tire of claim 1, wherein the chamber in cross section is of generally frustoconical shape.
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |