Patent US2922277A successfully refreshed from Google Patents.
US2922277A
Expired / Lapsed
US
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Device for increasing the momentum of a fluid especially applicable as a lifting or propulsion device
Assignee: Bertin Technologies SAS
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Filing: 1956-11-28
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Granted: 1960-01-26
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Expires: 1976-11-28
Abstract
No abstract record available.
Inventors
- 👤 Jean H Bertin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:46
CPC Classifications
F; F02; F02K; F02K1/00; F02K1/36; B; B64; B64C; B64C11/00; B64C11/001; B64C23/00; B64C23/005; F02K1/28; Y; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 0
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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) | 1963-01-25 | 1963-07-27 | 1964-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-25 | 1967-07-27 | 1968-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-25 | 1971-07-27 | 1972-01-26 | $7700.00 | Window Closed / Lapsed |