Patent US2864570A successfully refreshed from Google Patents.
US2864570A
Expired / Lapsed
US
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Servo system for controlling dirigible craft with primary and trim tab surfaces
Assignee: Unisys Corp
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Filing: 1955-08-30
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Granted: 1958-12-16
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Expires: 1975-08-30
Abstract
No abstract record available.
Inventors
- 👤 Clinton D Burdick
- 👤 George R Arthur
- 👤 Richard S Brannin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:18
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/0055; G05D1/0061
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-15 | 1962-06-16 | 1962-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-15 | 1966-06-16 | 1966-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-15 | 1970-06-16 | 1970-12-16 | $7700.00 | Window Closed / Lapsed |