US3355737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio direction finders
Assignee: BAE Systems Electronics Ltd
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Filing: 1966-02-14
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Granted: 1967-11-28
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Expires: 1986-02-14
Abstract
No abstract record available.
Inventors
- 👤 Byatt Dennis William George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:28
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/14; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A RADIO DIRECTION FINDER COMPRISING AT LEAST ONE COMPOSITE AERIAL SYSTEM INCLUDING A DIRECTIONAL AERIAL ADAPTED TO RECEIVE SUBSTANTIALLY ONLY VERTICALLY POLARISED INCOMING WAVES AND A DIRECTIONAL AERIAL ADAPTED TO RECEIVE SUBSTANTIALLY ONLY HORIZONTALLY POLARISED INCOMING WAVES; ROTATIONAL DRIVING MEANS FOR SAID AERIAL SYSTEM TO CAUSE THE AERIALS THEREOF TO SWING THEIR DIRECTIONS IN AZIMUTH WITH A COMMON INSTANTANEOUS DIRECTION; A RECEIVER; SWITCH MEANS FOR SUPPLYING SIGNALS FROM THE AERIALS OF SAID SYSTEM ALTERNATELY TO SAID RECEIVER AT A FREQUENCY OF ALTERATION WHICH IS HIGH IN RELATION TO THE ROTATIONAL SPEED OF THE SYSTEM; AND MEANS FOR UTILISING THE OUTPUT OF THE RECEIVER TO ASCERTAIN THE DIRECTION OF INCOMING WAVES.
Claim 2
Dependent Claim
110 words
A RADIO DIRECTION FINDER COMPRISING AT LEAST ONE COMPOSITE AERIAL SYSTEM INCLUDING A DIRECTIONAL AERIAL ADAPTED TO RECEIVE SUBSTANTIALLY ONLY VERTICALLY POLARISED INCOMING WAVES AND A DIRECTIONAL AERIAL ADAPTED TO RECEIVE SUBSTANTIALLY ONLY HORIZONTALLY POLARISED INCOMING WAVES; ROTATIONAL DRIVING MEANS FOR SAID AERIAL SYSTEM TO CAUSE THE AERIALS THEREOF TO SWING THEIR DIRECTIONS IN AZIMUTH WITH A COMMON INSTANTANEOUS DIRECTION; A RECEIVER; SWITCH MEANS FOR SUPPLYING SIGNALS FROM THE AERIALS OF SAID SYSTEM ALTERNATELY TO SAID RECEIVER AT A FREQUENCY OF ALTERATION WHICH IS HIGH IN RELATION TO THE ROTATIONAL SPEED OF THE SYSTEM; AND MEANS FOR UTILISING THE OUTPUT OF THE RECEIVER TO ASCERTAIN THE DIRECTION OF INCOMING WAVES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-27 | 1971-05-29 | 1971-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-27 | 1975-05-29 | 1975-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-27 | 1979-05-29 | 1979-11-28 | $7700.00 | Window Closed / Lapsed |