Dual wavelength fire detection method and apparatus
CA 2226098 A1 · Owner: Detector Electronics Corporation · Inventors: Schuler, Frederick J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for extracting a number of temporal frequencies occurring in a fire and false fire condition concurrently is described. Two or more radiation detectors receive optical signals. Temporal components of the detected signal are extracted and correlated to distinguish a small fire in the presence of a larger non-fire source. The ratio at each extracted frequency following proper qualification is compared to the ratio band for fire and an output signal is generated when the ratio at one or more temporal frequencies indicates a fire.
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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
- Filed January 5, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 5, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 5, 2020.
- 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.