Patent US3132340A successfully refreshed from Google Patents.
US3132340A
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Frequency modulation distance indicator
Assignee: GTE Sylvania Inc
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Filing: 1958-05-21
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Granted: 1964-05-05
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Expires: 1978-05-21
Abstract
No abstract record available.
Inventors
- 👤 Galejs Janis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:56
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/32; G01S13/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
IN A FREQUENCY MODULATION DISTANCE MEASURING SYSTEM, MEANS FOR TRANSMITTING RADIO WAVES FREQUENCY MODULATED IN ACCORDANCE WITH A FIRST PERIODIC SIGNAL CHANGING ABRUPTLY BETWEEN A FIRST FREQUENCY AND A SECOND FREQUENCY, MEANS ADJACENT TO THE TRANSMITTING MEANS RECEIVING SAID WAVES AFTER A DELAY BY REFLECTION FROM AN OBJECT, MEANS FOR GENERATING A LOCAL OSCILLATOR SIGNAL FREQUENCY MODULATED IN ACCORDANCE WITH A SECOND PERIODIC SIGNAL OF THE SAME FORM BUT OPPOSITE IN PHASE TO SAID FIRST SIGNAL, MEANS FOR MIXING THE RECEIVED WAVES WITH SAID LOCAL OSCILLATOR SIGNAL TO PRODUCE A RESULTANT SIGNAL CONTAINING DIFFERENCE FREQUENCIES, MEANS FOR AMPLIFYING SELECTED ONES OF SAID DIFFERENCE FREQUENCIES, MEANS FOR VARYING THE PERIOD OF SAID FIRST AND SECOND PERIODIC SIGNALS TO MAINTAIN THE AMPLITUDE OF SAID SELECTED ONES OF SAID DIFFERENCE FREQUENCIES AT ITS MAXIMUM VALUE, AND MEANS FOR SENSING THE CHANGES IN THE PERIOD OF SAID FIRST AND SECOND PERIODIC SIGNALS REQUIRED TO MAINTAIN SAID MAXIMUM VALUE TO OBTAIN A MEASURE OF THE DISTANCE FROM THE TRANSMITTING MEANS TO SAID OBJECT.
Claim 2
Dependent Claim
168 words
IN A FREQUENCY MODULATION DISTANCE MEASURING SYSTEM, MEANS FOR TRANSMITTING RADIO WAVES FREQUENCY MODULATED IN ACCORDANCE WITH A FIRST PERIODIC SIGNAL CHANGING ABRUPTLY BETWEEN A FIRST FREQUENCY AND A SECOND FREQUENCY, MEANS ADJACENT TO THE TRANSMITTING MEANS RECEIVING SAID WAVES AFTER A DELAY BY REFLECTION FROM AN OBJECT, MEANS FOR GENERATING A LOCAL OSCILLATOR SIGNAL FREQUENCY MODULATED IN ACCORDANCE WITH A SECOND PERIODIC SIGNAL OF THE SAME FORM BUT OPPOSITE IN PHASE TO SAID FIRST SIGNAL, MEANS FOR MIXING THE RECEIVED WAVES WITH SAID LOCAL OSCILLATOR SIGNAL TO PRODUCE A RESULTANT SIGNAL CONTAINING DIFFERENCE FREQUENCIES, MEANS FOR AMPLIFYING SELECTED ONES OF SAID DIFFERENCE FREQUENCIES, MEANS FOR VARYING THE PERIOD OF SAID FIRST AND SECOND PERIODIC SIGNALS TO MAINTAIN THE AMPLITUDE OF SAID SELECTED ONES OF SAID DIFFERENCE FREQUENCIES AT ITS MAXIMUM VALUE, AND MEANS FOR SENSING THE CHANGES IN THE PERIOD OF SAID FIRST AND SECOND PERIODIC SIGNALS REQUIRED TO MAINTAIN SAID MAXIMUM VALUE TO OBTAIN A MEASURE OF THE DISTANCE FROM THE TRANSMITTING MEANS TO SAID OBJECT.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |