US3566403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polarized radar detection system
Assignee: Raytheon Co
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Filing: 1949-03-08
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Granted: 1971-02-23
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Expires: 1969-03-08
Abstract
Abstract A RADAR SYSTEM ADAPTED TO DIFFERENTIATE BETWEEN MANMADE TARGETS AND NATURAL OBJECTS IN WHICH PLANE POLARIZED ENERGY IS TRANSMITTED AND, AFTER REFLECTION, ECHO SIGNALS ARE RECEIVED BY TWO ANTENNAS, ONE HAVING A PLANE OF POLARIZATION COPLANAR WITH THE PLANE OF POLARIZATION OF THE TRANSMITTED ENERGY AND THE OTHER HAVING A PLANE OF POLARIZATION ORTHOGONAL THERETO. AFTER THE ECHO SIGNALS ARE PROCESSED IN TWO SEPARATE CHANNELS AND COMPARED, A BLANKING SIGNAL IS GENERATED FROM SIGNALS WHICH SUFFER THE LEAST AMOUNT OF CHANGE IN POLARIZATION, I.E. ECHO SIGNALS FROM NATURAL OBJECTS TO ACCENTUATE ECHO SIGNALS FROM MAN-MADE TARGETS.
Inventors
- 👤 Elmer G Hills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:39
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/024; G01S7/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |