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| Number | Title | Issue Date |
| 5354983 | Object detector utilizing a threshold detection distance and suppression means for detecting the presence of a motor vehicle A method and apparatus are disclosed which allow for the detection of an object (14) by the generation of a radiated beam (18) and a subsequent reflection by the object (14) of a portion (20) thereof. The detection of particulate object material (16) due ... | 10/11/1994 |
| 5122796 | Object detection method and apparatus emplying electro-optics Apparatus for detecting the presence of an object within an area under surveillance employs an electro-optical emitter for directing light into the area and an electro-optical receiver for sensing light reflected from the object which originates from the ... | 06/16/1992 |
