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Patent US3817812A successfully refreshed from Google Patents.
US3817812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drum for building green tires
Assignee: Bridgestone Corp
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Filing: 1972-05-02
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Granted: 1974-06-18
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Expires: 1992-05-02
Abstract
Abstract A DRUM FOR BUILDING GREEIN TIRES IS PROVIDED WHEREBT VARIOUS KINDS OF GREEN CASES HAVING DIFFERENT DIAMETERS MAY BE BUILT BY A MERE REPLACEMENT OF SEGMENTS IN A SIMPLE AND RAPID MANNER. THE REPLACEMENT OF SEGMENTS IS SIMPLIFIED BY PROVIDING A SLIDING RIDGE-GROOVE CONNECTION BETWEEN THE SEGMENTS AND A WEDGE-LIKE CYLINDER. THE WEDGE-LIKE CYLINDER IS RECIPROCATED BY A PRESSURE FLUID TO EXPAND AND CONTRACT THE SEGMENTS.
Inventors
- 👤 T Yabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:40
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/08; B29D30/20; B29D30/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |