US3240446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preselect altitude control system for aircraft
Assignee: Unisys Corp
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Filing: 1963-10-15
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Granted: 1966-03-15
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Expires: 1983-10-15
Abstract
No abstract record available.
Inventors
- 👤 Miller Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:12
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/04; G05D1/06; G05D1/0607
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
101 words
IN APPARATUS FOR AIRCRAFT FOR AUTOMATICALLY AND ASYMPTOTICALLY APPROACHING A DESIRED ALTITUDE, (A) ALTITUDE SENSING MEANS FOR GENERATING FIRST AND SECOND SIGNALS REPRESENTATIVE OF THE ALTITUDE AND RATE OF CHANGE OF ALTITUDE RESPECTIVELY OF SAID AIRCRAFT, (B) MANUALLY SETTABLY COMMAND RATE OF CHANGE OF ALTITUDE MEANS FOR GENERATING A THIRD SIGNAL REPRESENTATIVE OF THE COMMANDED RATE OF CHANGE OF ALTITUDE, (C) MANUALLY SETTABLE ALTITUDE SELECTING MEANS FOR GENERATING A FOURTH SIGNAL REPRESENTATIVE OF SAID DESIRED ALTITUDE, (D) MEANS RESPONSIVE TO SAID FIRST AND FOURTH SIGNALS FOR PROVIDING A FIGTH SIGNAL REPRESENTATIVE OF THE DEVIATION OF SAID AIRCRAFT FROM SAID DESIRED ALTITUDE,
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) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |