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Patent US1582391A successfully refreshed from Google Patents.
US1582391A
Expired / Lapsed
US
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Governing of surfaces moving within alpha nonrigid medium
Assignee: Individual
•
Filing: 1922-02-03
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Granted: 1926-04-27
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Expires: 1942-02-03
Abstract
No abstract record available.
Inventors
- 👤 Flettner Anton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:15
CPC Classifications
B; B63; B63H; B63H25/00; B63H25/06; B63H25/38; B63H25/381
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) | 1929-04-26 | 1929-10-26 | 1930-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-04-26 | 1933-10-26 | 1934-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-04-26 | 1937-10-26 | 1938-04-27 | $7700.00 | Window Closed / Lapsed |