Carbon monoxide and smoke detection apparatus
CA 2303274 A1 · Owner: Johnston, Derek Scott · Inventors: Delia, Vincent J.; Johnston, Derek Scott
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A smoke sensor and a carbon monoxide sensor are integrated into a common detector housing (50a). The smoke sensor is coupled to the smoke detector integrated circuit (114) which generates a binary output signal indicative of the presence of smoke. This signal is coupled to a programmed microprocessor (102) in the detecting housing (50a). The carbon monoxide sensor is also coupled to the microprocessor (102). Outputs from the two sensors are processed substantially independently. In the presence of smoke the smoke , alarm is generated by the microprocessor. In the presence of sufficient levels of carbon monoxide, in the absence of smoke a carbon monoxide alarm will be , generated. The …
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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 August 5, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 5, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 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.