US3286256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for zero i.f. frequency and ionospheric pulse reception
Assignee: EMI Ltd
•
Filing: 1965-07-20
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Granted: 1966-11-15
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Expires: 1985-07-20
Abstract
No abstract record available.
Inventors
- 👤 Dennis H Covill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:21
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/52; G01S13/522; G01S13/524; G01S13/53; G01S13/88; G01S13/95; G01S13/951; H; H03; H03D; H03D1/00; H03D1/22; Y; Y02; Y02A; Y02A90/00; Y02A90/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A RECEIVER IN A PULSE ECHO RADAR SYSTEM FOR RECEIVING ECHOS SIGNALS COMPRISING PULSES OF OSCILLATION OF WHICH THE FREQUENCY IS KNOWN AND OF WHICH THE PHASE VARIES AS A FUNCTION OF TIME, DEPENDING UPON THE PROPAGATION TIME FROM THE TRANSMITTER TO THE RECEIVER, COMPRISING, MEANS FOR FORMING THE PRODUCT OF THE RECEIVED PULSES AND AN OSCILLATION OF SAID KNOWN FREQUENCY, MEANS FOR SELECTING FROM THE OUTPUT OF THE PRODUCT FORMING MEANS THE COMPONENT CORRESPONDING TO THE PULSE ENVELOPE OF THE RECEIVED SIGNAL, THE AMPLITUDE AND POLARITY OF SAID PULSE ENVELOPE BEING A FUNCTION INTERALIA OF THE PHASE VARIATION OF SAID OSCILLATION, MEANS FOR RECTIFYING SAID PULSE ENVELOPE COMPONENT TO DEVICE AN UNI-DIRECTIONAL SIGNAL CONTAINING EXCURSIONS TO ONLY ONE POLARITY, AND MEANS FOR INTERGRATING SAID UNIDIRECTIONAL SIGNAL OVER AN INTERVAL OF TIME SUFFICIENT TO DERIVE AN OUTPUT SIGNAL SUBSTANTIALLY INDEPENDENT OF SAID VARIATIONS IN PULSE ENVELOPE AMPLITUDE AND POLARITY DUE TO SAID PHASE VARIATIONS.
Claim 2
Dependent Claim
154 words
A RECEIVER IN A PULSE ECHO RADAR SYSTEM FOR RECEIVING ECHOS SIGNALS COMPRISING PULSES OF OSCILLATION OF WHICH THE FREQUENCY IS KNOWN AND OF WHICH THE PHASE VARIES AS A FUNCTION OF TIME, DEPENDING UPON THE PROPAGATION TIME FROM THE TRANSMITTER TO THE RECEIVER, COMPRISING, MEANS FOR FORMING THE PRODUCT OF THE RECEIVED PULSES AND AN OSCILLATION OF SAID KNOWN FREQUENCY, MEANS FOR SELECTING FROM THE OUTPUT OF THE PRODUCT FORMING MEANS THE COMPONENT CORRESPONDING TO THE PULSE ENVELOPE OF THE RECEIVED SIGNAL, THE AMPLITUDE AND POLARITY OF SAID PULSE ENVELOPE BEING A FUNCTION INTERALIA OF THE PHASE VARIATION OF SAID OSCILLATION, MEANS FOR RECTIFYING SAID PULSE ENVELOPE COMPONENT TO DEVICE AN UNI-DIRECTIONAL SIGNAL CONTAINING EXCURSIONS TO ONLY ONE POLARITY, AND MEANS FOR INTERGRATING SAID UNIDIRECTIONAL SIGNAL OVER AN INTERVAL OF TIME SUFFICIENT TO DERIVE AN OUTPUT SIGNAL SUBSTANTIALLY INDEPENDENT OF SAID VARIATIONS IN PULSE ENVELOPE AMPLITUDE AND POLARITY DUE TO SAID PHASE VARIATIONS.
References Cited (Backward Citations)
US2535274A
Cited
US3132339A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |