Patent US2933287A successfully refreshed from Google Patents.
US2933287A
Expired / Lapsed
US
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Multiple stage turbine unit
Assignee: Individual
•
Filing: 1956-05-28
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Granted: 1960-04-19
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Expires: 1976-05-28
Abstract
No abstract record available.
Inventors
- 👤 Alfred M Caddell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:35
CPC Classifications
F; F01; F01D; F01D1/00; F01D1/32; F02; F02C; F02C7/00
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |