Patent US3921690A successfully refreshed from Google Patents.
US3921690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic tires
Assignee: Dunlop Ltd
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Filing: 1973-11-07
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Granted: 1975-11-25
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Expires: 1993-11-07
Abstract
Abstract A radial ply tire whose beads are provided with an apex and clinch strip made from a rubber compound of hardness at least 70* BS and a resilience of at least 60 percent at 50*C. The tire is primarily intended to be used in a tire and wheel assembly which can be run with the tire deflated.
Inventors
- 👤 Reginald Harold Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:11
CPC Classifications
B; B60; B60C; B60C15/00; B60C15/06; B60C17/00; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10819; Y10T152/10828; Y10T152/10846
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
156 words
A pneumatic tire comprising a tread braced by a breaker assembly, rubber sidewall portions and beads and reinforced by a carcass comprising cords extending substantially radially in at least said sidewall portions and turned up about inextensible bead cores, said tire further comprising an inner lining layer of rubber inside the carcass, each bead being provided with a rubber apex extending radially outwardly from the bead core and a clinch strip adjacent the rim flange contacting area of the bead, said clinch strip and said apex being made of a rubber compound having a hardness of at least 70* B.S. and a resilience of at least 60% measured at 50*C according to B.S. 903 Part A8 Method C - Dunlop Pendulum, and the whole of the inner lining layer and of the sidewall portions extending radially outwardly from the clinch strip to the edge of the tread has a resilience of 85 percent measured at 50*C.
Claim 2
Dependent Claim
156 words
A pneumatic tire comprising a tread braced by a breaker assembly, rubber sidewall portions and beads and reinforced by a carcass comprising cords extending substantially radially in at least said sidewall portions and turned up about inextensible bead cores, said tire further comprising an inner lining layer of rubber inside the carcass, each bead being provided with a rubber apex extending radially outwardly from the bead core and a clinch strip adjacent the rim flange contacting area of the bead, said clinch strip and said apex being made of a rubber compound having a hardness of at least 70* B.S. and a resilience of at least 60% measured at 50*C according to B.S. 903 Part A8 Method C - Dunlop Pendulum, and the whole of the inner lining layer and of the sidewall portions extending radially outwardly from the clinch strip to the edge of the tread has a resilience of 85 percent measured at 50*C.
Claim 3
Dependent Claim
27 words
A pneumatic tire according to claim 1 in which the rubber compound of the clinch strip and the apex has a resilience of at least 65 percent.
Claim 4
Dependent Claim
26 words
A pneumatic tire according to claim 1 in which the rubber compound of the apex and clinch strip has a hardness of at least 80* B.S.
Claim 5
Dependent Claim
29 words
A pneumatic tire according to claim 1, having a substantially flat tread which is wider than the distance between the heels of the beads when the tire is inflated.
Claim 6
Dependent Claim
24 words
A pneumatic tire according to claim 4 in which the tread is at least 35 percent wider than the distance between the bead heels.
Claim 7
Dependent Claim
17 words
A pneumatic tire according to claim 1 having an aspect ratio in the range 50% - 75%.
Claim 8
Dependent Claim
29 words
A pneumatic tire according to claim 1 in which the rubber of the inner lining layer and of the sidewall portions has a hardness of 50* - 65* B.S.
Claim 9
Dependent Claim
29 words
A penumatic tire according to claim 7 in which the resilience of the rubber of the inner lining layer and of the sidewall portions is at least 87 percent.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |