Patent US2389274A successfully refreshed from Google Patents.
US2389274A
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US
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Aircraft control system
Assignee: Lockheed Martin Corp
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Filing: 1941-02-04
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Granted: 1945-11-20
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Expires: 1961-02-04
Abstract
No abstract record available.
Inventors
- 👤 Jr Earle S Pearsall
- 👤 Richolt Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:53
CPC Classifications
B; B64; B64C; B64C13/00; Y; Y02; Y02T; Y02T50/00; Y02T50/40; Y10; Y10S; Y10S60/00; Y10S60/904
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) | 1948-11-19 | 1949-05-21 | 1949-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-11-19 | 1953-05-21 | 1953-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-11-19 | 1957-05-21 | 1957-11-20 | $7700.00 | Window Closed / Lapsed |