US3373423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-level flight system
Assignee: General Precision Systems Inc
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Filing: 1965-05-26
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Granted: 1968-03-12
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Expires: 1985-05-26
Abstract
No abstract record available.
Inventors
- 👤 Levy Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:03
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/20; G01C21/22; G01S; G01S13/00; G01S13/88; G01S13/93; G01S13/933; G01S13/935; G01S13/882
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
309 words
A PASSIVE LOW-LEVEL FLIGHT SYSTEM OPERABLE TO DISPLAY TO THE PILOT OF AN OPERATIONAL AIRCRAFT SIMULATED TERRAIN ELEVATION FEATURES, COMPRISING, IN COMBINATION: A PHOTOGRAPHIC FILM TRANSPARENCY HAVING ENCODED THEREON IN GRAY SCALE VARIATIONS TERRAIN ELEVATION CONTOURS REPRESENTATIVE OF THE HEIGHT ABOVE SEAL LEVEL OF EACH INCREMENTAL PORTION OF THE TERRAIN LOCATED IN THE AREA OVER WHICH THE AIRCRAFT IS TO BE FLOWN; A FLYING-SPOT-SCANNER AND A PHOTO-SENSITIVE DEVICE; MEANS POSITIONING SAID TRANSPARENCY INTERMEDIATE SAID FLYING-SPOT-SCANNER AND SAID PHOTO-SENSITIVE DEVICE WHEREBY SAID GRAY SCALE VARIATIONS MODULATE THE LIGHT TRANSMITTED BY SAID SCANNER INCIDENT UPON SAID PHOTO-SENSITIVE DEVICE, SAID POSITIONING MEANS BEING RESPONSIVE TO THE LOCATION OF SAID AIRCRAFT TO EMPLACE SUCCESSIVE SPECIFIC REGIONS OF SAID TRANSPARENCY IN THE AREA SCANNED BY SAID FLYING-SPOT-SCANNER; FIRST AND SECOND DEFLECTION CIRCUITS COUPLED TO SAID FLYING-SPOT-SCANNER TO DEFLECT THE LIGHT BEAM PROVIDED THEREBY ACROSS SAID SUCCESSIVE SPECIFIC REGIONS OF SAID TRANSPARENCY; COMPUTER CIRCUITRY COUPLED TO SAID PHOTO-SENSITIVE DEVICE TO PROVIDE A MODIFIED VIDEO SIGNAL PROPORTIONAL TO H1, R(T) AND E''(T) WHEREIN H1 IS THE HEIGHT OF THE AIRCRAFT ABOVE THE TERRAIN AS ENCODED UPON SAID TGRANSPARENCY, R(T) IS THE LINEAR RANGE BETWEEN THE AIRCRAFT POSITION AND THE TERRAIN BEING VIEWED, AND E''(T) IS THE OUTPUT OF SAID PHOTO-SENSITIVE DEVICE AS MODULATED BY SAID GRAY SCALE VARIATIONS ENCODED UPON SAID TRANSPARENCY; A PILOT''S DISPLAY DEVICE HAVING AT LEAST ONE INPUT TERMINAL; A COMPARISON AND SWITCHING CIRCUIT INTERCONNECTING SAID MODIFIED VIDEO SIGNAL WITH SAID AT LEAST ONE INPUT TERMINAL NORMALLY OPERABLE TO COUPLE SAID MODIFIED VIDEO SIGNAL TO SAID AT LEAST ONE INPUT TERMINAL; RADAR MEANS FOR DERIVING A SIGNAL H2 CORREPSONDING TO THE ACTUAL HEIGHT OF THE AIRCRAFT ABOVE THE TERRAIN; AND SAID COMPARATOR AND SWITCHING CIRCUIT BEING FURTHER OPERABLE TO DECOUPLE SAID MODIFIED VIDEO SIGNAL FROM SAID AT LEAST ONE INPUT TERMINAL WHEN THE MAGNITUDES OF H1 AND H2 DIFFER BY A PREDETERMINED AMOUNT,
Claim 2
Dependent Claim
95 words
THE SYSTEM OF CLAIM 7 INCLUDING, A RADAR TERRAIN AVOIDANCE SYSTEM; CIRCUIT MEANS COUPLING THE OUTPUT OF SAID RADAR TERRAIN AVOIDANCE SYSTEM TO AN INPUT TO SAID COMPARATOR AND SWITCHING CIRCUIT; AND SAID COMPARATOR AND SWITCHING CIRCUIT ADDITIONALLY OPERABLE TO NORMALLY MAINTAIN SAID RADAR TERRAIN AVOIDANCE SYSTEM INACTIVE WHEN THE MAGNITUDES OF H1 AND H2 DIFFER BY LESS THAN SAID PREDETERMINED AMOUNT AND TO RENDER SAID RADAR TERRAIN AVOIDANCE SYSTEM ACTIVE AND COUPLE THE OUTPUT THEREFROM TO SAID PILOT''S DISPLAY DEVICE WHEN THE MAGNITUDES OF H1 AND H2 DIFFER BY MORE THAN SAID PREDETERMINED AMOUNT.
References Cited (Backward Citations)
US3290674A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-12 | 1971-09-11 | 1972-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-12 | 1975-09-11 | 1976-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-12 | 1979-09-11 | 1980-03-12 | $7700.00 | Window Closed / Lapsed |