Switching circuit which functions in conjunction with a 9-volt d. c. battery powered smoke detector and a 9-volt d.c. power adaptor
CA 2297360 A1 · Owner: Hudon, Alfred J. · Inventors: Hudon, Alfred J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electronic switching circuit includes a relay which controls the 9-volt D C power source to, the smoke detector this simplified switching circuit functions in the following manner, The normally closed side of the switching circuit is connected to the 9-volt battery terminal of the, smoke detector which is commonly used in most homes the normally opened side , of the, switching circuit is connected directly on to the terminal of the 9-volt battery a 9-volt D C power, adaptor plugs into the power terminal of the switching circuit whenever the 9volt DC power, adaptor is plugged into a electrical wall outlet this activates the relay powering the 9-volt DC, smoke detector directly from …
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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 26, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 26, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 26, 2022.
- 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.