Patent US3818964A successfully refreshed from Google Patents.
US3818964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tread profile of a radial tire for motor vehicles
Assignee: Industrie Pirelli SpA
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Filing: 1972-11-09
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Granted: 1974-06-25
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Expires: 1992-11-09
Abstract
Abstract A radial pneumatic tire having a tread disposed on a carcass between its sidewalls and having an annular reinforcing member or breaker embedded between the tread and carcass is provided with a shoulder between the tread and each sidewall having a conical surface to facilitate steering a vehicle equipped with radial tires from one lane to a second lane which is on a level higher than the first one.
Inventors
- 👤 L Maiocchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:24
CPC Classifications
B; B60; B60C; B60C9/00; B60C9/18; B60C9/20; B60C11/00; B60C11/01; B60C2011/013
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
180 words
A radial tire for vehicles comprising: a carcass with sidewalls which have a curved external profile in cross-section; a tread between the sidewalls and having an external profile which is curved in cross-section; a breaker between the tread and the underlying carcass; at the point of intersection between each sidewall and the tread, a right circular conical surface of rotation having its axis coincident with the axis of the tire, said conical surface comprising a continuous annular band integral with the tread and having a surface which lies in a plane at an angle of from 15* to 50* with the tangent of the tread''s profile; a plurality of circumferentially equally spaced radial grooves in said conical surface; and an annular groove coaxial with the axis of the tire in said conical surface; said breaker extending beyond the point of intersection of the conical surface with the tread but not beyond the point of intersection of said conical surface with said annular groove on that side of the groove which is axially nearer to the equatorial plane of the tire.
Claim 2
Dependent Claim
180 words
A radial tire for vehicles comprising: a carcass with sidewalls which have a curved external profile in cross-section; a tread between the sidewalls and having an external profile which is curved in cross-section; a breaker between the tread and the underlying carcass; at the point of intersection between each sidewall and the tread, a right circular conical surface of rotation having its axis coincident with the axis of the tire, said conical surface comprising a continuous annular band integral with the tread and having a surface which lies in a plane at an angle of from 15* to 50* with the tangent of the tread''s profile; a plurality of circumferentially equally spaced radial grooves in said conical surface; and an annular groove coaxial with the axis of the tire in said conical surface; said breaker extending beyond the point of intersection of the conical surface with the tread but not beyond the point of intersection of said conical surface with said annular groove on that side of the groove which is axially nearer to the equatorial plane of the tire.
Claim 3
Dependent Claim
45 words
The tire of claim 1 wherein the width of the breaker is such that each of its ends extend as far as the point of intersection of said conical surfaces with said annular groove which is axially nearer to the equatorial plane of the tire.
Claim 4
Dependent Claim
31 words
The tire of claim 1 wherein the ratio of the width of the open end of the annular groove to the width of the conical surface is between 0.3 and 0.6.
Claim 5
Dependent Claim
26 words
The tire of claim 1 wherein the depth of the annular groove is 0.2 to 0.5 of the width of the open end of the groove.
Claim 6
Dependent Claim
31 words
The tire of claim 2 wherein each of said radial grooves terminates at one end at the said point of intersection and terminates at the opposite end of the said sidewall.
Claim 7
Dependent Claim
44 words
The tire of claim 1 wherein the tread has cavities therein and the depth of the cavities is such that a line concentric with the profile of the tread in cross-section passes through the point of intersection of the conical surface with the sidewalls.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |