Patent US2489646A successfully refreshed from Google Patents.
US2489646A
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Automatic feathering and nonstallable force drive
Assignee: ALBERT G DICKINSON
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Filing: 1947-06-16
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Granted: 1949-11-29
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Expires: 1967-06-16
Abstract
No abstract record available.
Inventors
- 👤 Bertrand F Kenyon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:06
CPC Classifications
F; F16; F16H; F16H33/00; F16H33/02; F16H33/04; F16H33/08; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/1836; Y10T74/18368
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1269935A
Cited
GB152966A
Cited
GB223193A
Cited
FR622997A
Cited
US1767311A
Cited
FR649362A
Cited
US1816808A
Cited
US1914067A
Cited
US1949042A
Cited
GB474190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |