Apparatus and method for remotely controlling doorbell chimes from doorbell push button
CA 2213325 A1 · Owner: Dimango Products Corporation · Inventors: Xydis, Thomas G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus and method for remotely controlling doorbell chimes includes a doorbell activation circuit (40) having a manually actuated doorbell button (41) for activating a transmitter (43) to generate a predetermined frequency electromagnetic wave (45) from an antenna (44). A main doorbell chime circuit (46) includes an antenna (47) connected to receiver (48) and is responsive to the wave (45) for generating an acoustic frequency signal (50) from a main doorbell chime (49). One or more auxiliary doorbell chime circuits (52) each include an antenna (53) connected to receiver (54) and are responsive to the wave (45) for generating an acoustic frequency signal (56) from an auxiliary doorbell …
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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 18, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 18, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 18, 2019.
- 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.