Patent US3231890A successfully refreshed from Google Patents.
US3231890A
Expired / Lapsed
US
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Radio direction finder
Assignee: Bendix Corp
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Filing: 1963-07-01
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Granted: 1966-01-25
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Expires: 1983-07-01
Abstract
No abstract record available.
Inventors
- 👤 Joseph R Hoover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:47
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A RADIO DIRECTION-INDICATING SYSTEM COMPRISING: ANGULARLY MOVABLE DIRECTIONAL ANTENNA MEANS HAVING A DIRECTIONAL RADIUS, AND MEANS FOR ANGULARLY MOVING SAID ANTENNA MEANS WHEREBY INCOMING RADIO SIGNALS GENERATE AN ANTENNA CURRENT VARYING TOWARD AND AWAY FROM A LIMIT VALUE IN RESPONSE TO ANGULAR MOVEMENT OF THE ANTENNA MEANS SUCH AS TO SWEEP SAID DIRECTIONAL RADIUS ACROSS THE PATH OF THE INCOMING SIGNAL; MOVABLE REFERENCE CURRENT MEANS DELIVERING A REFERENCE CURRENT VARYING IN MAGNITUDE THROUGH A RANGE HAVING A MEDIAN VALUE IN AN INTERMEDIATE POINT IN SAID RANGE; MEANS MOVING SAID REFERENCE CURRENT MEANS IN FIXED PHASE RELATION WITH RESPECT TO MOVEMENT OF SAID ANTENNA MEANS WHEREBY SAID DIRECTIONAL RADIUS HAS A PREDETERMINED ORIENTATION AT THE TIME OF PASSAGE OF
Claim 2
Dependent Claim
118 words
A RADIO DIRECTION-INDICATING SYSTEM COMPRISING: ANGULARLY MOVABLE DIRECTIONAL ANTENNA MEANS HAVING A DIRECTIONAL RADIUS, AND MEANS FOR ANGULARLY MOVING SAID ANTENNA MEANS WHEREBY INCOMING RADIO SIGNALS GENERATE AN ANTENNA CURRENT VARYING TOWARD AND AWAY FROM A LIMIT VALUE IN RESPONSE TO ANGULAR MOVEMENT OF THE ANTENNA MEANS SUCH AS TO SWEEP SAID DIRECTIONAL RADIUS ACROSS THE PATH OF THE INCOMING SIGNAL; MOVABLE REFERENCE CURRENT MEANS DELIVERING A REFERENCE CURRENT VARYING IN MAGNITUDE THROUGH A RANGE HAVING A MEDIAN VALUE IN AN INTERMEDIATE POINT IN SAID RANGE; MEANS MOVING SAID REFERENCE CURRENT MEANS IN FIXED PHASE RELATION WITH RESPECT TO MOVEMENT OF SAID ANTENNA MEANS WHEREBY SAID DIRECTIONAL RADIUS HAS A PREDETERMINED ORIENTATION AT THE TIME OF PASSAGE OF
References Cited (Backward Citations)
US2557869A
Cited
US3076963A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-24 | 1969-07-26 | 1970-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-24 | 1973-07-26 | 1974-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-24 | 1977-07-26 | 1978-01-25 | $7700.00 | Window Closed / Lapsed |