Patent US3149330A successfully refreshed from Google Patents.
US3149330A
Expired / Lapsed
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Frequency modulated doppler radar system
Assignee: BAE Systems Electronics Ltd
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Filing: 1959-11-12
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Granted: 1964-09-15
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Expires: 1979-11-12
Abstract
No abstract record available.
Inventors
- 👤 Fiocco Giorgio Domenico
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:23
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/58; G01S13/60; G01S13/06; G01S13/08; G01S13/32; G01S13/34; G01S13/342
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A RANGE MEASURING RADAR SYSTEM COMPRISING A TRANSMITTER ADAPTED TO TRANSMIT A MODULATED HIGH FREQUENCY RADIO WAVE, MEANS FOR MODULATING SAID TRANSMITTER BY AT LEAST ONE PREDETERMINED CONTINUOUS WAVE MODULATING FREQUENCY, MEANS FOR RECEIVING REFLECTED SIGNALS, A FIRST MIXER FOR MIXING RECEIVED REFLECTED TRANSMITTED ENERGY WITH ENERGY TAKEN FROM SAID TRANSMITTER; MEANS FOR SELECTING FROM THE OUTPUT OF SAID MIXING MEANS A PREDETERMINED BAND OF FREQUENCIES, SAID BAND INCLUDING A PREDETERMINED SELECTED HARMONIC OF SAID MODULATING FREQUENCY; MEANS FOR DERIVING FROM MODULATING MEANS THE SAME PREDETERMINED HARMONIC OF SAID FREQUENCY; A SECOND MIXER, MEANS FOR FEEDING SAID PREDETERMINED BAND OF FREQUENCIES AND SAID SELECTED HARMONIC DERIVED FROM SAID MODULATING MEANS THROUGH TWO CHANNELS TO SAID MIXER, AN ADJUSTABLE PHASE SHIFTER CONNECTED IN ONE OF SAID CHANNELS, MEANS TO FEED THE OUTPUT FROM SAID SECOND MIXER TO A SIGNAL STRENGTH MEASURING DEVICE, AND MEANS TO INDICATE THE RANGE WHEN PHASE SHIFT ADJUSTMENT PROVIDES ZERO OUTPUT FROM SAID SECOND MIXER.
Claim 2
Dependent Claim
158 words
A RANGE MEASURING RADAR SYSTEM COMPRISING A TRANSMITTER ADAPTED TO TRANSMIT A MODULATED HIGH FREQUENCY RADIO WAVE, MEANS FOR MODULATING SAID TRANSMITTER BY AT LEAST ONE PREDETERMINED CONTINUOUS WAVE MODULATING FREQUENCY, MEANS FOR RECEIVING REFLECTED SIGNALS, A FIRST MIXER FOR MIXING RECEIVED REFLECTED TRANSMITTED ENERGY WITH ENERGY TAKEN FROM SAID TRANSMITTER; MEANS FOR SELECTING FROM THE OUTPUT OF SAID MIXING MEANS A PREDETERMINED BAND OF FREQUENCIES, SAID BAND INCLUDING A PREDETERMINED SELECTED HARMONIC OF SAID MODULATING FREQUENCY; MEANS FOR DERIVING FROM MODULATING MEANS THE SAME PREDETERMINED HARMONIC OF SAID FREQUENCY; A SECOND MIXER, MEANS FOR FEEDING SAID PREDETERMINED BAND OF FREQUENCIES AND SAID SELECTED HARMONIC DERIVED FROM SAID MODULATING MEANS THROUGH TWO CHANNELS TO SAID MIXER, AN ADJUSTABLE PHASE SHIFTER CONNECTED IN ONE OF SAID CHANNELS, MEANS TO FEED THE OUTPUT FROM SAID SECOND MIXER TO A SIGNAL STRENGTH MEASURING DEVICE, AND MEANS TO INDICATE THE RANGE WHEN PHASE SHIFT ADJUSTMENT PROVIDES ZERO OUTPUT FROM SAID SECOND MIXER.
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) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |