US4521587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for tread rubber of tires
Assignee: Sumitomo Rubber Industries Ltd
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Filing: 1984-02-06
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Granted: 1985-06-04
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Expires: 2004-02-06
Abstract
Abstract A composition for tread rubber of tires containing a synthetic isoprene rubber having a 3,4-bonding content of at least 15% by mole and an intrinsic viscosity of at least 2.0 in toluene at 30 DEG C. The composition can provide a rubber having an improved frictional characteristic on wet road with an excellent rolling resistance characteristic, and is very useful as a tread rubber of tires.
Inventors
- 👤 Hiroshi Furukawa
- 👤 Yuichi Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:31
CPC Classifications
B; B60; B60C; B60C1/00; B60C1/0016; C; C08; C08L; C08L9/00; Y; Y02; Y02T; Y02T10/00; Y02T10/80; Y02T10/86
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
64 words
A tire having a tire tread portion, said tire tread portion being a rubber obtained by curing a rubber composition consisting essentially of (a) a minor amount of a tire tread rubber additive, and (b) a major amount of a synthetic isoprene rubber having a 3,4-bonding content of 25-50% by mol and an intrinsic viscosity of at least 2.0 in toluene at 30° C.
Claim 2
Dependent Claim
64 words
A tire having a tire tread portion, said tire tread portion being a rubber obtained by curing a rubber composition consisting essentially of (a) a minor amount of a tire tread rubber additive, and (b) a major amount of a synthetic isoprene rubber having a 3,4-bonding content of 25-50% by mol and an intrinsic viscosity of at least 2.0 in toluene at 30° C.
Claim 3
Dependent Claim
29 words
The tire of claim 1, wherein said synthetic isoprene rubber has an intrinsic viscosity of from not less than 2.5 to less than 0.4 in toluene at 30° C.
References Cited (Backward Citations)
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Cited
US3448095A
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US3480607A
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Cited
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Cited
US4116887A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |