Patent US2804154A successfully refreshed from Google Patents.
US2804154A
Expired / Lapsed
US
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Concurrent blade pitch control of coaxial propellers
Assignee: Motors Liquidation Co
•
Filing: 1952-02-19
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Granted: 1957-08-27
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Expires: 1972-02-19
Abstract
No abstract record available.
Inventors
- 👤 Robert C Treseder
- 👤 Kenneth L Berninger
- 👤 William A Weis
- 👤 Albert P Dinsmore
- 👤 Garthwood R Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:54
CPC Classifications
B; B64; B64D; B64D35/00; B64D35/04
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) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |