US3196439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio direction finders
Assignee: BAE Systems Electronics Ltd
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Filing: 1962-05-09
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Granted: 1965-07-20
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Expires: 1982-05-09
Abstract
No abstract record available.
Inventors
- 👤 Byatt Dennis William George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:21
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S3/46; G01S3/50; G01S3/52; G01S3/54
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
84 words
A RADIO DIRECTION FINDER INCLUDING MEANS FOR SEPARATELY DEMODULATING AND DIFFERENTIATING SIGNALS RECEIVED AT GEOGRAPHICALLY SPACED POINTS FROM A TRANSMITTING MODULATED SIGNAL SOURCE; MEANS FOR MEASURING THE TIME INTERVAL BETWEEN CORRESPONDING DIFFERENTIATED RESULTANTS FIRST PRODUCED BY A GIVEN TRANSMITTED SIGNAL TO ASCERTAIN THE DIRECTION OF SAID SOURCE; AND FILTER MEANS FOR EXCLUDING, FROM THE DEMODULATED SIGNALS TO BE DIFFERENTIATED, SIGNALS HAVING A REPETITION PERIOD NOT GREATER THAN THE MAXIMUM TIME INTERVAL, AT SAID MEASURING MEANS, BETWEEN CORRESPONDING SIGNALS FROM THE DIFFERENT SPACED RECEIVING POINTS.
References Cited (Backward Citations)
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US3078415A
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US2637841A
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Cited
US2996712A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-19 | 1969-01-18 | 1969-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-19 | 1973-01-18 | 1973-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-19 | 1977-01-18 | 1977-07-20 | $7700.00 | Window Closed / Lapsed |