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| Number | Title | Issue Date |
| 7450052 | Object detection method and apparatus Method and apparatus for detecting objects. In one embodiment, a person entering a secured zone is illuminated with low-power polarized radio waves. Differently polarized waves which are reflected back from the person are collected. Concealed weapons are detected by... | 11/11/2008 |
| 6359582 | Concealed weapons detection system A weapons detector (12) and method utilizing radar. The system comprises a transmitter (27) for producing an output (14) of frequencies of a set of self-resonant frequencies of weaponry; an antenna (28) directing the transmitter output toward locations po... | 03/19/2002 |
| 6342696 | Object detection method and apparatus employing polarized radiation Methods and apparatus for detecting objects are disclosed. In one embodiment of the invention, a person entering a secured or "Safe Zone™" is illuminated with low-power polarized radio waves. Differently polarized waves which are reflected back from the... | 01/29/2002 |
