Patent US3089671A successfully refreshed from Google Patents.
US3089671A
Expired / Lapsed
US
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Flight control systems
Assignee: Unisys Corp
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Filing: 1960-09-23
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Granted: 1963-05-14
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Expires: 1980-09-23
Abstract
No abstract record available.
Inventors
- 👤 Donal R Treffeisen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:42
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/04; G05D1/06; G05D1/0607; G05D1/0653; G05D1/0661; G05D1/0669
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
APPARATUS FOR USE IN CONTROLLING THE PITCH ATTITUDE OF A VERTICAL TAKE-OFF AND LANDING AIRCRAFT DURING TAKE-OFF SAID CRAFT BEING OF THE TYPE WHICH TAKES OFF AND LANDS WITH ITS LONGITUDINAL AXIS SUBSTANTIALLY PERPENDICULAR TO THE EARTH COMPRISING MEANS PROVIDING THE CRAFT WITH A SUBSTANTIALLY CONSTANT RATE OF CLIMB, MEANS PROVIDING SIGNALS REPRESENTING A COMMANDED CRAFT PITCH RATE THAT IS SUBSTANTIALLY ZERO AND A COMMANDED CRAFT PITCH RATE THAT IS GREATER THAN ZERO, AND SERVO MEANS RESPONSIVE DURING A FIRST PORTION OF THE TAKE-OFF MANEUVER TO SAID ZERO PITCH RATE SIGNALS AND RESPONSIVE DURING A SECOND PORTION OF THE TAKE-OFF MANEUVER TO SAID OTHER PITCH RATE SIGNALS, SAID SERVO MEANS OPERATING TO DEFLECT THE CRAFT ELEVATORS AND
Claim 2
Dependent Claim
117 words
APPARATUS FOR USE IN CONTROLLING THE PITCH ATTITUDE OF A VERTICAL TAKE-OFF AND LANDING AIRCRAFT DURING TAKE-OFF SAID CRAFT BEING OF THE TYPE WHICH TAKES OFF AND LANDS WITH ITS LONGITUDINAL AXIS SUBSTANTIALLY PERPENDICULAR TO THE EARTH COMPRISING MEANS PROVIDING THE CRAFT WITH A SUBSTANTIALLY CONSTANT RATE OF CLIMB, MEANS PROVIDING SIGNALS REPRESENTING A COMMANDED CRAFT PITCH RATE THAT IS SUBSTANTIALLY ZERO AND A COMMANDED CRAFT PITCH RATE THAT IS GREATER THAN ZERO, AND SERVO MEANS RESPONSIVE DURING A FIRST PORTION OF THE TAKE-OFF MANEUVER TO SAID ZERO PITCH RATE SIGNALS AND RESPONSIVE DURING A SECOND PORTION OF THE TAKE-OFF MANEUVER TO SAID OTHER PITCH RATE SIGNALS, SAID SERVO MEANS OPERATING TO DEFLECT THE CRAFT ELEVATORS AND
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) | 1966-05-13 | 1966-11-12 | 1967-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-13 | 1970-11-12 | 1971-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-13 | 1974-11-12 | 1975-05-14 | $7700.00 | Window Closed / Lapsed |