Patent US2394299A successfully refreshed from Google Patents.
US2394299A
Expired / Lapsed
US
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Drive for oppositely rotating propellers
Assignee: Individual
•
Filing: 1941-01-16
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Granted: 1946-02-05
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Expires: 1961-01-16
Abstract
No abstract record available.
Inventors
- 👤 Friedrich Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:33
CPC Classifications
A; A43; A43B; A43B13/00; A43B13/28; A43B13/32; B; B64; B64D; B64D35/00; B64D35/04; Y; Y10; Y10S; Y10S416/00; Y10S416/50
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) | 1949-02-04 | 1949-08-06 | 1950-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-02-04 | 1953-08-06 | 1954-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-02-04 | 1957-08-06 | 1958-02-05 | $7700.00 | Window Closed / Lapsed |