Fire detector and electrode arrangement thereof
CA 1250927 A · Owner: Slm Investissements Sa · Inventors: Schmidt-Ott, Andreas; Siegmann, Hans-Christoph; Burtscher, Heinz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a fire detector with a measuring chamber (9,9') limited by two electrodes (1,2) whereby, an electric field is produced between the electrodes by a DC voltage source (4). The measuring electrode (1) is connected to the input of a current measuring device (3) without direct connection with the DC voltage source As soon as charged particles of smoke penetrate into the measuring chamber (9) between the electrodes the electric, field causes a motion of the positive and negative particles. This charge drift induces a current into the measuring electrode and this current is measured.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted March 7, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 7, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.