Patent GB708477A successfully refreshed from Google Patents.
US2439750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control system for aircraft
Assignee: Sperry Gyroscope Co Ltd
•
Filing: 1942-09-17
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Granted: 1948-04-13
•
Expires: 1962-09-17
Abstract
No abstract record available.
Inventors
- 👤 Nisbet Robert Hayes
- 👤 Glenny Arthur Philip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:07
CPC Classifications
B; B64; B64C; B64C13/00; B64C13/02; B64C13/16; B64C13/18
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) | 1951-04-13 | 1951-10-13 | 1952-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-13 | 1955-10-13 | 1956-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-13 | 1959-10-13 | 1960-04-13 | $7700.00 | Window Closed / Lapsed |