Patent US4933121A successfully refreshed from Google Patents.
US2612331A
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Automatic flight controller
Assignee: Individual
•
Filing: 1947-03-19
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Granted: 1952-09-30
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Expires: 1967-03-19
Abstract
No abstract record available.
Inventors
- 👤 Robert L Frazier
- 👤 Harry B Breedlove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:24
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/04; G05D1/06; G05D1/0607; G05D1/0653
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2357319A
Cited
US1727696A
Cited
US2314029A
Cited
US2322225A
Cited
US2308846A
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US2321582A
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US2253508A
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US2423336A
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US2336891A
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US2367649A
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US2356922A
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US2415430A
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US2452311A
Cited
US2355026A
Cited
US2539411A
Cited
US2471821A
Cited
US2502522A
Cited
US2444927A
Cited
US2474618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-30 | 1956-03-31 | 1956-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-30 | 1960-03-31 | 1960-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-30 | 1964-03-31 | 1964-09-30 | $7700.00 | Window Closed / Lapsed |