Patent US4373069A successfully refreshed from Google Patents.
US4373069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elastomer compositions
Assignee: BTR Industries Ltd
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Filing: 1979-08-28
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Granted: 1983-02-08
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Expires: 1999-08-28
Abstract
Abstract Tires having good grip on wet road surfaces and low frictional resistance to rolling on the road surface have treads formed from vulcanisates of elastomer compositions comprising a major component consisting of one or more polymers having a glass transition temperature (Tg) of minus 50° C. or lower temperature, and a minor component consisting of one or more polymers having a glass transition temperature of ambient temperature or higher temperature. The major component can consist of one or more rubbery polymers selected from natural rubbers, polybutadienes synthetic polyisoprenes and rubbery styrene-butadiene copolymers; and the minor component can consist of a resinous styrene-butadiene co-polymer.
Inventors
- 👤 Robert Bond
- 👤 Robert J. Blythe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:32
CPC Classifications
C; C08; C08L; C08L21/00; C08L23/00; C08L23/02; C08L23/18; C08L23/20; C08L23/22; C08L25/00; C08L25/02; C08L25/04; C08L25/08; C08L25/10; Y; Y10; Y10S; Y10S152/00; Y10S152/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A tire having the combined properties of good grip on a wet road surface and low frictional resistance to rolling on the road, the tread of said tire comprising a material obtained by vulcanizing an elastomer blend comprising: (a) as a major component a polymer selected from the group consisting of natural rubber, synthetic polyisoprene, rubbery styrene-butadiene copolymer and mixtures thereof having a glass transition temperature at most equal to -50° C.; and (b) as a minor component at least one resinous styrene-butadiene copolymer having a glass transition temperature above 15° C.; said blend being substantially free of polybutadiene and said minor component being present in an amount up to 45% of the total weight of the major and minor components, which amount is effective to product said combined properties, and wherein said resinous styrene-butadiene copolymer has a styrene content in the range from 80-90% by weight.
Claim 2
Dependent Claim
147 words
A tire having the combined properties of good grip on a wet road surface and low frictional resistance to rolling on the road, the tread of said tire comprising a material obtained by vulcanizing an elastomer blend comprising: (a) as a major component a polymer selected from the group consisting of natural rubber, synthetic polyisoprene, rubbery styrene-butadiene copolymer and mixtures thereof having a glass transition temperature at most equal to -50° C.; and (b) as a minor component at least one resinous styrene-butadiene copolymer having a glass transition temperature above 15° C.; said blend being substantially free of polybutadiene and said minor component being present in an amount up to 45% of the total weight of the major and minor components, which amount is effective to product said combined properties, and wherein said resinous styrene-butadiene copolymer has a styrene content in the range from 80-90% by weight.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-07 | 1986-08-09 | 1987-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-07 | 1990-08-09 | 1991-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-07 | 1994-08-09 | 1995-02-08 | $7700.00 | Window Closed / Lapsed |