US3749335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Autopilot system controlling entry of a craft into forbidden zones
Assignee: OK Tool Co Inc
•
Filing: 1970-10-23
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Granted: 1973-07-31
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Expires: 1990-10-23
Abstract
Abstract In combination with the autopilot system of an aircraft an onboard control system inaccessible to the pilot responds to ground transmitted or onboard computed geographical position signals to restrict pilot heading or descent maneuvers when the aircraft enters a forbidden geographical zone.
Inventors
- 👤 T Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:53
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/0055
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
A pilotted aircraft control system comprising: means for maneuvering the craft, means beyond the control of the pilot to register continuously the entry of the craft into and continued presence in a predetermined geographical zone, and means beyond the control of the pilot responsive to said register and controlling said maneuvering means to prevent a selected maneuver of the craft in said geographical zone, the register means being operative to control the maneuvering means so long as presence in the zone is registered, wherein said maneuvering means comprises an elevator or like aircraft pitch element, characterized by altitude sensing means connected to said responsive means to cause said responsive means to control the pitch element so as to prevent descent of the aircraft below a predetermined altitude in said geographical zone.
Claim 2
Dependent Claim
131 words
A pilotted aircraft control system comprising: means for maneuvering the craft, means beyond the control of the pilot to register continuously the entry of the craft into and continued presence in a predetermined geographical zone, and means beyond the control of the pilot responsive to said register and controlling said maneuvering means to prevent a selected maneuver of the craft in said geographical zone, the register means being operative to control the maneuvering means so long as presence in the zone is registered, wherein said maneuvering means comprises an elevator or like aircraft pitch element, characterized by altitude sensing means connected to said responsive means to cause said responsive means to control the pitch element so as to prevent descent of the aircraft below a predetermined altitude in said geographical zone.
Claim 3
Dependent Claim
98 words
A pilotted aircraft control system comprising means for adjusting climb and descent of the aircraft, means for sensing descent of the aircraft below a predetermined altitute, means beyond the control of the pilot to register the geographical position of the aircraft and continuously produce a control signal when a predetermined position is registered, and means beyond pilot control responsive to the sensing means and register means and controlling the climb and descent adjusting means only to prevent said adjusting means from causing descent of the aircraft below said predetermined altitude when the aircraft is in said geographical position.
Claim 4
Dependent Claim
98 words
A pilotted aircraft control system comprising means for adjusting climb and descent of the aircraft, means for sensing descent of the aircraft below a predetermined altitute, means beyond the control of the pilot to register the geographical position of the aircraft and continuously produce a control signal when a predetermined position is registered, and means beyond pilot control responsive to the sensing means and register means and controlling the climb and descent adjusting means only to prevent said adjusting means from causing descent of the aircraft below said predetermined altitude when the aircraft is in said geographical position.
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |