US3214756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous wave frequency modulation distance measuring apparatus
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1960-08-02
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Granted: 1965-10-26
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Expires: 1980-08-02
Abstract
No abstract record available.
Inventors
- 👤 Goldberg Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:35
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/32; G01S13/34; G01S13/342
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
RADIO DISTANCE-MEASURING APPARATUS COMPRISING MEANS FOR PRODUCTING A FIRST SIGNAL OF A PREDETERMINED FREQUENCY, MEANS FOR AMPLITUDE-MODULATING SAID SIGNAL AT A CONTROL FREQUENCY TO FORM A MODULATING SIGNAL, A CARRIER WAVE SOURCE, MEANS FOR FREQUENCY-MODULATING SAID CARRIER WVE BY SAID MODULATING SIGNAL TO FORM A FREQUENCYMODULATED CARRIER WVE, MEANS FOR RADIATING SAID FREQUENCY-MODULATED CARRIER WVE, MEANS FOR RECEIVING SAID FREQUENCY-MODULATED CARRIER WAVE AFTER REFLECTION FROM A SPACED POINT, MEANS FOR DERIVING A LOCAL WAVE FROM SAID MODULATED CARRIER WAVE, MEANS FOR MIXING SAID LOCAL WAVE WITH SAID RECEIVED WAVE TO PRODUCE A DIFFERENCE FREQUENCY SIGNAL, MEANS FOR FREQUENCY-SHIFTING ONE WAVE OF THE GROUP CONSISTING OF SAID RECEIVED, RADIATED, AND LOCAL WAVES PRIOR TO SAID MIXING, MEANS RESPONSIVE TO SAID DIFFERENCE-FREQUENCY WAVE FOR MAINTAING A CONSTANT AVERAGE VALUE OF MODULATION INDEX FOR SAID DIFFERENCE-
Claim 2
Dependent Claim
133 words
RADIO DISTANCE-MEASURING APPARATUS COMPRISING MEANS FOR PRODUCTING A FIRST SIGNAL OF A PREDETERMINED FREQUENCY, MEANS FOR AMPLITUDE-MODULATING SAID SIGNAL AT A CONTROL FREQUENCY TO FORM A MODULATING SIGNAL, A CARRIER WAVE SOURCE, MEANS FOR FREQUENCY-MODULATING SAID CARRIER WVE BY SAID MODULATING SIGNAL TO FORM A FREQUENCYMODULATED CARRIER WVE, MEANS FOR RADIATING SAID FREQUENCY-MODULATED CARRIER WVE, MEANS FOR RECEIVING SAID FREQUENCY-MODULATED CARRIER WAVE AFTER REFLECTION FROM A SPACED POINT, MEANS FOR DERIVING A LOCAL WAVE FROM SAID MODULATED CARRIER WAVE, MEANS FOR MIXING SAID LOCAL WAVE WITH SAID RECEIVED WAVE TO PRODUCE A DIFFERENCE FREQUENCY SIGNAL, MEANS FOR FREQUENCY-SHIFTING ONE WAVE OF THE GROUP CONSISTING OF SAID RECEIVED, RADIATED, AND LOCAL WAVES PRIOR TO SAID MIXING, MEANS RESPONSIVE TO SAID DIFFERENCE-FREQUENCY WAVE FOR MAINTAING A CONSTANT AVERAGE VALUE OF MODULATION INDEX FOR SAID DIFFERENCE-
References Cited (Backward Citations)
US2726383A
Cited
US3054104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |