"The wireless music box has no imaginable commercial value. Who would pay for a message sent to nobody in particular?"
David Sarnoff, American radio pioneer ; 1921
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| Number | Title | Issue Date |
| 6255651 | Detector There is described a detector which is suitable for use as a fire detector. The detector has two channels which allow for discrimination between energy received from a fire and a "false fire". False fires are sometimes detected as a result of radiation fr... | 07/03/2001 |
| 6188278 | Amplification circuits An amplification circuit for use with an electro chemical cell is disclosed. The cell is operated in the amperometric mode and finds beneficial application in the detection of carbon monoxide (CO) gas. The amplification circuit of the invention is used to... | 02/13/2001 |
| 5612537 | Detecting the presence of a fire Apparatus for detecting the presence of a fire includes a pair of detectors for radiation characteristic of a fire, e.g. at 4.3 microns, and a further detector for radiation characteristic of a black body, e.g. at 3.8 microns. Filters select the detector ... | 03/18/1997 |