Patent US2699644A successfully refreshed from Google Patents.
US2699644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydropropeller
Assignee: Individual
•
Filing: 1948-02-02
•
Granted: 1955-01-18
•
Expires: 1968-02-02
Abstract
No abstract record available.
Inventors
- 👤 Coanda Henri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:28
CPC Classifications
B; B63; B63H; B63H11/00; B63H11/02; B63H11/04; Y; Y02; Y02T; Y02T70/00; Y02T70/10
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) | 1958-01-17 | 1958-07-19 | 1959-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-17 | 1962-07-19 | 1963-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-17 | 1966-07-19 | 1967-01-18 | $7700.00 | Window Closed / Lapsed |