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Assignee: Thorn Security Limited


Location: Middlesex, GB
No. of patents: 3

NumberTitleIssue Date
6255651Detector
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
6188278Amplification 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
5612537Detecting 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
 
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