US3349402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary radar systems
Assignee: AC Cossor Ltd
•
Filing: 1965-05-28
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Granted: 1967-10-24
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Expires: 1985-05-28
Abstract
No abstract record available.
Inventors
- 👤 Foster Kenneth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:36
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/74; G01S13/76; G01S13/762
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
IN A SECONDARY RADAR SYSTEM GROUND STATION APPARATUS COMPRISING A ROTATING DIRECTIONAL AERIAL, A FIRST RECEIVER COUPLED TO THE DIRECTIONAL AERIAL, A DISPLAY MEANS COUPLED TO THE FIRST RECEIVER TO DISPLAY ANSWERING SIGNALS RECEIVED BY THE DIRECTIONAL AERIAL FROM A TRANSPONDER, A NONDIRECTIONAL AERIAL, A SECOND RECEIVER COUPLED TO THE NONDIRECTIONAL AERIAL, AND A REFLECTING OBSTACLE IN THE VICINITY OF SAID AERIALS WHICH OBSTACLE IS PERIODICALLY SWEPT BY THE MAIN BEAM OF SAID ROTATING DIRECTIONAL AERIAL, THE IMPROVEMENT COMPRISING: COMPARATOR MEANS COUPLED TO SAID FIRST AND SECOND RECEIVERS FOR PROVIDING AN OUT-PUT SIGNAL WHEN A SIGNAL IS RECEIVED BY THE SECOND RECEIVER AND NOT SIMULTANEOUSLY RECEIVED BY THE FIRST RECEIVER; AND INHIBITING MEANS RESPONSIVE TO SAID COMPARATOR OUTPUT SIGNAL TO INHIBIT THE DISPLAY MEANS FOR A PREDETERMINED INTERVAL OF TIME, SO AS TO PREVENT THE DISPLAY OF A SUBSEQUENT ANSWERING SIGNAL RECEIVED BY SAID ROTATING DIRECTIONAL AERIAL VIA SAID OBSTACLE BEING SWEPT BY THE MAIN BEAM OF SAID ROTATING DIRECTIONAL AERIAL.
Claim 2
Dependent Claim
161 words
IN A SECONDARY RADAR SYSTEM GROUND STATION APPARATUS COMPRISING A ROTATING DIRECTIONAL AERIAL, A FIRST RECEIVER COUPLED TO THE DIRECTIONAL AERIAL, A DISPLAY MEANS COUPLED TO THE FIRST RECEIVER TO DISPLAY ANSWERING SIGNALS RECEIVED BY THE DIRECTIONAL AERIAL FROM A TRANSPONDER, A NONDIRECTIONAL AERIAL, A SECOND RECEIVER COUPLED TO THE NONDIRECTIONAL AERIAL, AND A REFLECTING OBSTACLE IN THE VICINITY OF SAID AERIALS WHICH OBSTACLE IS PERIODICALLY SWEPT BY THE MAIN BEAM OF SAID ROTATING DIRECTIONAL AERIAL, THE IMPROVEMENT COMPRISING: COMPARATOR MEANS COUPLED TO SAID FIRST AND SECOND RECEIVERS FOR PROVIDING AN OUT-PUT SIGNAL WHEN A SIGNAL IS RECEIVED BY THE SECOND RECEIVER AND NOT SIMULTANEOUSLY RECEIVED BY THE FIRST RECEIVER; AND INHIBITING MEANS RESPONSIVE TO SAID COMPARATOR OUTPUT SIGNAL TO INHIBIT THE DISPLAY MEANS FOR A PREDETERMINED INTERVAL OF TIME, SO AS TO PREVENT THE DISPLAY OF A SUBSEQUENT ANSWERING SIGNAL RECEIVED BY SAID ROTATING DIRECTIONAL AERIAL VIA SAID OBSTACLE BEING SWEPT BY THE MAIN BEAM OF SAID ROTATING DIRECTIONAL AERIAL.
References Cited (Backward Citations)
US2422122A
Cited
US3094695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-23 | 1971-04-24 | 1971-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-23 | 1975-04-24 | 1975-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-23 | 1979-04-24 | 1979-10-24 | $7700.00 | Window Closed / Lapsed |