US3686389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a pneumatic tire
Assignee: Bridgestone Firestone Inc
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Filing: 1970-05-20
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Granted: 1972-08-22
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Expires: 1990-05-20
Abstract
Abstract A method of making a pneumatic tire which includes the steps of separately forming first and second sidewall members and thereafter placing or locating two of the sidewall members in a centrifugal casting mold. As located in the centrifugal casting mold, the sidewall members are spaced from each other in the tread area of the finished tire. The two sidewall members are connected together by centrifugally casting a connecting material into the space between the two sidewall members and the material which forms the connection is compatible with the material of construction of the sidewall members.
Inventors
- 👤 Heinz Wilhelm Beneze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:07
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/0679; B29D30/08; B29D2030/084
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
118 words
The method of making a pneumatic tire including the steps of separately centrifugally casting a liquid polyurethane material into two tire sidewalls each having a bead portion and a tread portion, placing each of the separately cast sidewalls into a centrifugal casting mold with a portion of one sidewall at its tread portion being spaced from a portion of the other sidewall at its tread portion, rotating the centrifugal casting mold and introducing a curable liquid polyurethane material thereinto which travels by centrifugal action to and fills the space between said spaced tread portions, at least partially curing the polyurethane material in said space to join said sidewalls together and removing the finished pneumatic tire from the mold.
References Cited (Backward Citations)
US3505437A
Cited
US3529054A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |