US3149334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio direction finding system
Assignee: International Standard Electric Corp
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Filing: 1962-07-11
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Granted: 1964-09-15
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Expires: 1982-07-11
Abstract
No abstract record available.
Inventors
- 👤 Cleaver Richard Francis
- 👤 Cockerill Francis Geoffrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:59
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A RADIO DIRECTION FINDING SYSTEM INCLUDING A FIRST ANTENNA SYSTEM HAVING ANTENNA MEANS TO RECEIVE SIGNALS AT SUCCESSIVE POINTS ON A CIRCUMFERENTIAL PATH, A SECOND ANTENNA SYSTEM, A SIGNAL COMBINING CIRCUIT, MEANS TO CONNECT THE SIGNAL COMBINING CIRCUIT TO THE FIRST ANTENNA SYSTEM AT SUCCESSIVE POSITIONS ON THE SAID CIRCUMFERENTIAL PATH, A FREQUENCY SHIFT CIRCUIT, MEANS COUPLING SAID SECOND ANTENNA SYSTEM TO SAID FREQUENCY SHIFT CIRCUIT, MEANS COUPLING THE OUTPUT OF SAID FREQUENCY SHIFT CIRCUIT TO SAID SIGNAL COMBINING CIRCUIT, AN AMPLITUDE MODULATION DETECTOR, CIRCUIT MEANS TO CONNECT AN OUTPUT FROM THE SIGNAL COMBINING CIRCUIT TO THE AMPLITUDE MODULATION DETECTOR, A FREQUENCY MODULATION DETECTOR, CIRCUIT MEANS TO CON-
Claim 2
Dependent Claim
108 words
A RADIO DIRECTION FINDING SYSTEM INCLUDING A FIRST ANTENNA SYSTEM HAVING ANTENNA MEANS TO RECEIVE SIGNALS AT SUCCESSIVE POINTS ON A CIRCUMFERENTIAL PATH, A SECOND ANTENNA SYSTEM, A SIGNAL COMBINING CIRCUIT, MEANS TO CONNECT THE SIGNAL COMBINING CIRCUIT TO THE FIRST ANTENNA SYSTEM AT SUCCESSIVE POSITIONS ON THE SAID CIRCUMFERENTIAL PATH, A FREQUENCY SHIFT CIRCUIT, MEANS COUPLING SAID SECOND ANTENNA SYSTEM TO SAID FREQUENCY SHIFT CIRCUIT, MEANS COUPLING THE OUTPUT OF SAID FREQUENCY SHIFT CIRCUIT TO SAID SIGNAL COMBINING CIRCUIT, AN AMPLITUDE MODULATION DETECTOR, CIRCUIT MEANS TO CONNECT AN OUTPUT FROM THE SIGNAL COMBINING CIRCUIT TO THE AMPLITUDE MODULATION DETECTOR, A FREQUENCY MODULATION DETECTOR, CIRCUIT MEANS TO CON-
References Cited (Backward Citations)
US2481509A
Cited
US2860336A
Cited
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 |