US3833043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casting tires
Assignee: Bridgestone Corp
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Filing: 1972-09-28
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Granted: 1974-09-03
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Expires: 1992-09-28
Abstract
Abstract Casting tires having high strength and various excellent driving properties are produced by firstly casting (or molding) any one of a tread-crown portion on a case body portion with a high molecular weight substance and then prior to the completion of the curing of the firstly cast (or molded) substance, casting (or molding) the other portion with another high molecular weight substance having different physical properties from the former substance successively and curing both substances concurrently, said case body not containing any reinforcing material.
Inventors
- 👤 K Watanabe
- 👤 N Tomita
- 👤 H Uruta
- 👤 N Yoshimura
- 👤 T Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:14
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
139 words
A pneumatic casting tire consisting of a tread-crown having patterned grooves in the road-engaging surface thereof and a case body integral with said tread-crown, said case body being of doughnut-like shape with a hollow interior and an open inner periphery, said case body having side walls extending from said tread-crown and terminating at a pair of spaced bead portions, said case body being composed of high molecular weight polymeric substance having a modulus of elasticity at 50 percent elongation of 140 to 650 Kg/cm2 and containing no reinforcing material, the thickness from the bottom of said grooves to the boundary between said tread-crown and said case body being 10 to 40 percent of the depth of said grooves, and said tread-crown being composed of a high molecular weight polymeric substance having a Shore A hardness of 50* to 75*.
Claim 2
Dependent Claim
139 words
A pneumatic casting tire consisting of a tread-crown having patterned grooves in the road-engaging surface thereof and a case body integral with said tread-crown, said case body being of doughnut-like shape with a hollow interior and an open inner periphery, said case body having side walls extending from said tread-crown and terminating at a pair of spaced bead portions, said case body being composed of high molecular weight polymeric substance having a modulus of elasticity at 50 percent elongation of 140 to 650 Kg/cm2 and containing no reinforcing material, the thickness from the bottom of said grooves to the boundary between said tread-crown and said case body being 10 to 40 percent of the depth of said grooves, and said tread-crown being composed of a high molecular weight polymeric substance having a Shore A hardness of 50* to 75*.
Claim 3
Dependent Claim
23 words
Casting tires as claimed in claim 1, wherein both sides of the tread are formed with the same material as the case body.
Claim 4
Dependent Claim
28 words
Casting tires as claimed in claim 2, wherein said case body is composed of ether type polyurethane and said thread-crown is composed of styrene-butadiene rubber or natural rubber.
Claim 5
Dependent Claim
28 words
Casting tires as claimed in claim 1, wherein said case body is composed of ether type polyurethane and said tread-crown is composed of styrene-butadiene rubber or natural 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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |