US4210188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic tires for motor vehicles having compression-stressed sidewalls
Assignee: Industrie Pirelli SpA
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Filing: 1978-04-10
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Granted: 1980-07-01
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Expires: 1998-04-10
Abstract
Abstract A pneumatic tire having a generally trapezoidal section and sidewalls which are predominantly under compression under load is provided with non-reinforced sidewalls made of an elastomeric composition having a dynamic modulus of elasticity between 8 and 13 megapascal units and the tangent of the loss angle is between 0.03 and 0.15. By controlling the ratio between the absolute value of the modulus and the relative loss angle, the tire has optimum mechanical characteristics.
Inventors
- 👤 Carlo Banchieri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:22
CPC Classifications
B; B60; B60C; B60C1/00; B60C1/0025; B60C13/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
78 words
A pneumatic tire for motor vehicles comprising a top portion provided with a substantially inextensible annular reinforcement member and sidewalls which are subjected to compression stresses and are substantially non-reinforced, wherein said sidewalls are formed at least partially by an elastomeric composition selected from the group consisting of elastomeric compositions having a compressive dynamic elasticity modulus of absolute value between 8 and 13 MPa and wherein the tangent of the corresponding loss angle is between 0.03 and 0.15.
Claim 2
Dependent Claim
78 words
A pneumatic tire for motor vehicles comprising a top portion provided with a substantially inextensible annular reinforcement member and sidewalls which are subjected to compression stresses and are substantially non-reinforced, wherein said sidewalls are formed at least partially by an elastomeric composition selected from the group consisting of elastomeric compositions having a compressive dynamic elasticity modulus of absolute value between 8 and 13 MPa and wherein the tangent of the corresponding loss angle is between 0.03 and 0.15.
Claim 3
Dependent Claim
50 words
The pneumatic tire of claim 1, wherein the absolute value of the compressive dynamic elasticity modulus of said elastomeric composition is not lower than 9 MPa and not greater than 12 MPa, while the tangent of the corresponding loss angle is not lower than 0.05 and not greater than 0.11.
Claim 4
Dependent Claim
19 words
The pneumatic tire of claim 1, characterized in that said elastomeric composition is based on natural rubber or polyisoprene.
Claim 5
Dependent Claim
18 words
The pneumatic tire of claim 3, characterized in that said elastomeric composition comprises polybutadiene as additional polymeric component.
Claim 6
Dependent Claim
21 words
The pneumatic tire of claim 1, characterized in that said elastomeric composition is based on butadiene-styrene rubber of the oil-extended type.
Claim 7
Dependent Claim
11 words
The pneumatic tire of claim 1 having a generally trapezoidal section.
Claim 8
Dependent Claim
23 words
The pneumatic tire of claim 1 wherein the said annular reinforcement extends laterally to the zones where the sidewalls and top portion connect.
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) | 1983-07-01 | 1983-12-31 | 1984-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-01 | 1987-12-31 | 1988-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-01 | 1991-12-31 | 1992-07-01 | $7700.00 | Window Closed / Lapsed |