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| Number | Title | Issue Date |
| 4352098 | Surveillance systems A surveillance system transmits a microwave carrier signal through a surveillance zone (14). Two low frequency energy fields are also established in the zone being produced by respective pairs of closely spaced apart low frequency signals radiated from op... | 09/28/1982 |
| 4303910 | Detection system A system for monitoring the position of a receptor reradiator in a surveillance zone having a first means for transmitting a first signal through the zone, and a receptor reradiator operable in response to reception of said signal to radiate at least one ... | 12/01/1981 |
