US4154277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic tire having an improved tread
Assignee: Bridgestone Corp
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Filing: 1977-02-17
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Granted: 1979-05-15
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Expires: 1997-02-17
Abstract
Abstract A pneumatic tire having a tread formed of a rubber composition consisting essentially of rubber and carbon black having specifically limited iodine adsorbability, dibutyl phthalate absorbability and tinting strength, has excellent cut resistance, chipping resistance, wear resistance and resistance against heat build-up, and is excellent in the running durability on both of paved road and off road.
Inventors
- 👤 Nobuo Sato
- 👤 Isamu Imai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:05
CPC Classifications
B; B60; B60C; B60C1/00; B60C1/0016; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; B60C2200/00; B60C2200/14; Y; Y10; Y10S; Y10S152/00; Y10S152/905
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
58 words
A pneumatic tire having a tread formed of a rubber composition consisting essentially of 100 parts by weight of natural rubber or synthetic polyisoprene rubber and 30-60 parts by weight of highly reinforcing carbon black having an iodine adsorbability of 130-150 mg/g, a dibutyl phthalate absorbability of 80-105 ml/100 g and a tinting strength of at least 240%.
Claim 2
Dependent Claim
58 words
A pneumatic tire having a tread formed of a rubber composition consisting essentially of 100 parts by weight of natural rubber or synthetic polyisoprene rubber and 30-60 parts by weight of highly reinforcing carbon black having an iodine adsorbability of 130-150 mg/g, a dibutyl phthalate absorbability of 80-105 ml/100 g and a tinting strength of at least 240%.
Claim 3
Dependent Claim
78 words
A pneumatic tire having a tread formed of a rubber composition consisting essentially of 100 parts by weight of a rubber blend, which consists of at least 70% by weight of natural rubber or synthetic polyisoprene rubber and the remainder being diene series synthetic rubber, and 30-60 parts by weight of highly reinforcing carbon black having an iodine adsorbability of 130-150 mg/g, a dibutyl phthalate adsorbability of 80-105 ml/100 g and a tinting strength of at least 240%.
Claim 4
Dependent Claim
78 words
A pneumatic tire having a tread formed of a rubber composition consisting essentially of 100 parts by weight of a rubber blend, which consists of at least 70% by weight of natural rubber or synthetic polyisoprene rubber and the remainder being diene series synthetic rubber, and 30-60 parts by weight of highly reinforcing carbon black having an iodine adsorbability of 130-150 mg/g, a dibutyl phthalate adsorbability of 80-105 ml/100 g and a tinting strength of at least 240%.
Claim 5
Dependent Claim
33 words
A pneumatic tire according to claim 2, wherein said rubber blend, consists of at least 90% by weight of natural rubber or synthetic polyisoprene rubber and the remainder being diene series synthetic rubber.
Claim 6
Dependent Claim
16 words
A pneumatic tire according to claim 2, wherein said diene series synthetic rubber is polybutadiene rubber.
Claim 7
Dependent Claim
16 words
A pneumatic tire according to claim 2, wherein said diene series synthetic rubber is styrene-butadiene rubber.
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) | 1982-05-14 | 1982-11-13 | 1983-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-14 | 1986-11-13 | 1987-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-14 | 1990-11-13 | 1991-05-15 | $7700.00 | Window Closed / Lapsed |