US4309318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tread compositions for tires having low rolling resistance
Assignee: Yokohama Rubber Co Ltd
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Filing: 1979-11-16
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Granted: 1982-01-05
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Expires: 1999-11-16
Abstract
Abstract A tread composition for low rolling resistance tires, comprising 100 parts by weight of styrene-butadiene rubber or a styrene-butadiene rubber-based rubber blend and 3.2-5.0 parts by weight of sulphur.
Inventors
- 👤 Asahiro Ahagon
- 👤 Makoto Misawa
- 👤 Hiroshi Hirakawa
- 👤 Kazuo Miyasaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:43
CPC Classifications
C; C08; C08L; C08L7/00; B; B60; B60C; B60C1/00; B60C1/0016; C08L9/00; C08L9/06; C08K; C08K3/00; C08K3/30; C08L11/00; Y; Y02; Y02T; Y02T10/00; Y02T10/80; Y02T10/86
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
74 words
A tread composition for tires having low rolling resistance consisting essentially of, by weight, (A) 100 parts of a member selected from the group consisting of styrene-butadiene rubber alone and a mixture containing at least 50% of styrene-butadiene rubber and less than 50% of at least one member selected from the group consisting of natural rubber and synthetic diene rubbers, (B) 3.2-5.0 parts of sulphur and (C) at least 40 parts of carbon black.
Claim 2
Dependent Claim
74 words
A tread composition for tires having low rolling resistance consisting essentially of, by weight, (A) 100 parts of a member selected from the group consisting of styrene-butadiene rubber alone and a mixture containing at least 50% of styrene-butadiene rubber and less than 50% of at least one member selected from the group consisting of natural rubber and synthetic diene rubbers, (B) 3.2-5.0 parts of sulphur and (C) at least 40 parts of carbon black.
Claim 3
Dependent Claim
34 words
A tread composition according to claim 1, wherein the carbon black has an iodine adsorption number of number of 60-100 gI 2 /kg and a DBP adsorption number of at least 119 cc/100 g.
Claim 4
Dependent Claim
14 words
A tread composition according to claim 1, wherein said sulphur is in β-crystal form.
Claim 5
Independent Claim
107 words
A method for lowering the rolling resistance of tires comprising providing tires with a tread having a composition formed by admixing (A) 100 parts of a member selected from the group consisting of styrene-butadiene rubber alone and a mixture containing at least 50% of styrene-butadiene rubber and less than 50% of at least one member selected from the group consisting of natural rubber and synthetic diene rubbers, (B) 3.2-5.0 parts of sulphur and (C) at least 40 parts of carbon black having an iodine adsorption number of 60-100 gI 2 /kg and a DBP adsorption number of at least 119 cc/100 g, said parts being by weight.
Claim 6
Independent Claim
107 words
A method for lowering the rolling resistance of tires comprising providing tires with a tread having a composition formed by admixing (A) 100 parts of a member selected from the group consisting of styrene-butadiene rubber alone and a mixture containing at least 50% of styrene-butadiene rubber and less than 50% of at least one member selected from the group consisting of natural rubber and synthetic diene rubbers, (B) 3.2-5.0 parts of sulphur and (C) at least 40 parts of carbon black having an iodine adsorption number of 60-100 gI 2 /kg and a DBP adsorption number of at least 119 cc/100 g, said parts being by weight.
Claim 7
Dependent Claim
13 words
A method according to claim 4, wherein said sulphur is in β-crystal form.
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) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |