US3135956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio navigation apparatus
Assignee: North American Aviation Corp
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Filing: 1962-06-08
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Granted: 1964-06-02
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Expires: 1982-06-08
Abstract
No abstract record available.
Inventors
- 👤 Samuel L Dolce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:16
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/58; G01S13/60; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
IN A RADIO NAVIGATION SYSTEM HAVING A TRANSMITTER, A RECEIVER, A DOWNWARD-LOOKING DIRECTIONAL ANTENNA AND ANTENNA AZIMUTH SCANNING MEANS FOR CAUSING SAID ANTENNA TO SCAN TO THE RIGHT AND LEFT SIDES OF AN AZIMUTH REFERENCE, THE COMBINATION COMPRISING: AT LEAST ONE PAIR OF FILTERS RESPONSIVELY CONNECTED TO SAID RECEIVER FOR DISTINGUISHING TWO MUTUALLY DISTINCT FREQUENCIES CONTAINED WITHIN THE SPECTRA OF AN OUTPUT OF SAID RECEIVER; COMPARISON MEANS RESPONSIVELY CONNECTED TO SAID FILTERS FOR COMPARING THE AMPLITUDES OF THE OUTPUTS OF SAID FILTERS; ADJUSTABLE GAIN MEANS IN SERIES WITH ONE OF SAID FILTERS AND RESPONSIVELY CONNECTED TO SAID ANTENNA SCANNING MEANS FOR NORMALIZING THE GAIN OF ONE FILTER RELATIVE TO THE OTHER AS A FUNCTION OF ANTENNA LOOK-ANGLE; VELOCITY SIGNAL GENERATING MEANS RESPONSIVELY CONNECTED TO SAID COMPARISON MEANS AND SAID SCANNING MEANS FOR PROVIDING A SIGNAL INDICATIVE OF A DOPPLER VELOCITY, AND DRIFT ANGLE SIGNAL GENERATING MEANS RESPONSIVELY CONNECTED TO SAID COMPARISON MEANS AND SAID SCANNING MEANS FOR PROVIDING A SIGNAL INDICATIVE OF THE DRIFT ANGLE OF SAID DOPPLER VELOCITY.
Claim 2
Dependent Claim
169 words
IN A RADIO NAVIGATION SYSTEM HAVING A TRANSMITTER, A RECEIVER, A DOWNWARD-LOOKING DIRECTIONAL ANTENNA AND ANTENNA AZIMUTH SCANNING MEANS FOR CAUSING SAID ANTENNA TO SCAN TO THE RIGHT AND LEFT SIDES OF AN AZIMUTH REFERENCE, THE COMBINATION COMPRISING: AT LEAST ONE PAIR OF FILTERS RESPONSIVELY CONNECTED TO SAID RECEIVER FOR DISTINGUISHING TWO MUTUALLY DISTINCT FREQUENCIES CONTAINED WITHIN THE SPECTRA OF AN OUTPUT OF SAID RECEIVER; COMPARISON MEANS RESPONSIVELY CONNECTED TO SAID FILTERS FOR COMPARING THE AMPLITUDES OF THE OUTPUTS OF SAID FILTERS; ADJUSTABLE GAIN MEANS IN SERIES WITH ONE OF SAID FILTERS AND RESPONSIVELY CONNECTED TO SAID ANTENNA SCANNING MEANS FOR NORMALIZING THE GAIN OF ONE FILTER RELATIVE TO THE OTHER AS A FUNCTION OF ANTENNA LOOK-ANGLE; VELOCITY SIGNAL GENERATING MEANS RESPONSIVELY CONNECTED TO SAID COMPARISON MEANS AND SAID SCANNING MEANS FOR PROVIDING A SIGNAL INDICATIVE OF A DOPPLER VELOCITY, AND DRIFT ANGLE SIGNAL GENERATING MEANS RESPONSIVELY CONNECTED TO SAID COMPARISON MEANS AND SAID SCANNING MEANS FOR PROVIDING A SIGNAL INDICATIVE OF THE DRIFT ANGLE OF SAID DOPPLER VELOCITY.
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) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |