Patent US3181153A successfully refreshed from Google Patents.
US3181153A
Expired / Lapsed
US
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Precision instrument landing system
Assignee: Individual
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Filing: 1959-09-25
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Granted: 1965-04-27
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Expires: 1979-09-25
Abstract
No abstract record available.
Inventors
- 👤 Richard T Cella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:34
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/88; G01S13/91; G01S13/913; G05; G05D; G05D1/00; G05D1/04; G05D1/06; G05D1/0607; G05D1/0653; G05D1/0676
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A PRECISION INSTRUMENT LANDING SYSTEM FOR GUIDING AN AIRCRAFT TO ACTUAL TOUCHDOWN ON A RUNWAY, COMPRISING A PAIR OF RADAR REFLECTORS LOCATED A KNOWN DISTANCE FROM THE LANDING END OF THE RUNWAY AND AT FIXED DISTANCES TO THE LEFT AND RIGHT RESPECTIVELY OF THE CENTRAL AXIS OF THE RUNWAY, AT LEAST TWO RADAR TRANSMITTING AND RECEIVING MEANS ON SAID AIRCRAFT ADAPTED TO TRANSMIT RADAR PULSES AND TO RECEIVE ECHO PULSES REFLECTED FROM SAID LEFT AND RIGHT REFLECTORS RESPECTIVELY, AND TIME SENSING MEANS TO DERIVE THEREFROM SIGNALS REPRESENTING THE RANGE TO THE RESPECTIVE REFLECTOR, COMPRISING MEANS CONNECTED TO RECEIVE SAID SIGNALS AND TO PRODUCE AN OUTPUT SIGNAL REPRESENTING THE DIFFERENCE BETWEEN THE RANGE SIGNALS, AND A MEMBER RESPONSIVE TO SAID OUTPUT SIGNAL HAVING A RESPONSVE PROPORTIONAL TO THE DIFFERENCE BETWEEN SAID FIRST SIGNALS AND REPRESENTING THE DEVIATION OF THE PATH OF THE PLANE FROM THE CORRECT APPROACH PATH.
Claim 2
Dependent Claim
147 words
A PRECISION INSTRUMENT LANDING SYSTEM FOR GUIDING AN AIRCRAFT TO ACTUAL TOUCHDOWN ON A RUNWAY, COMPRISING A PAIR OF RADAR REFLECTORS LOCATED A KNOWN DISTANCE FROM THE LANDING END OF THE RUNWAY AND AT FIXED DISTANCES TO THE LEFT AND RIGHT RESPECTIVELY OF THE CENTRAL AXIS OF THE RUNWAY, AT LEAST TWO RADAR TRANSMITTING AND RECEIVING MEANS ON SAID AIRCRAFT ADAPTED TO TRANSMIT RADAR PULSES AND TO RECEIVE ECHO PULSES REFLECTED FROM SAID LEFT AND RIGHT REFLECTORS RESPECTIVELY, AND TIME SENSING MEANS TO DERIVE THEREFROM SIGNALS REPRESENTING THE RANGE TO THE RESPECTIVE REFLECTOR, COMPRISING MEANS CONNECTED TO RECEIVE SAID SIGNALS AND TO PRODUCE AN OUTPUT SIGNAL REPRESENTING THE DIFFERENCE BETWEEN THE RANGE SIGNALS, AND A MEMBER RESPONSIVE TO SAID OUTPUT SIGNAL HAVING A RESPONSVE PROPORTIONAL TO THE DIFFERENCE BETWEEN SAID FIRST SIGNALS AND REPRESENTING THE DEVIATION OF THE PATH OF THE PLANE FROM THE CORRECT APPROACH PATH.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-26 | 1968-10-26 | 1969-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-26 | 1972-10-26 | 1973-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-26 | 1976-10-26 | 1977-04-27 | $7700.00 | Window Closed / Lapsed |