Call forwarding system for doorbell/intercom box
CA 2132181 A1 · Owner: Telestate International, L.P. · Inventors: Rounds, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A door box call forwarding system includes a door box (10) having associated therewith a speaker (16) and a microphone (14). The doorbell (18) is operable to be depressed and transmit a signal to a control station (26). The control station (26) includes a processing unit (36) which is operable in a normal operating mode to effect a voice channel with auxiliary stations (28). In a remote mode, the processing unit (36) is operable to retrieve from a lookup table the phone number of a remote residence (32). Upon receiving a command from the door box (10) that the doorbell (18) has been depressed the remote location (32), is accessed by dialing the phone number stored in the lookup table and? …
Read the whole patent
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 September 15, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 15, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 15, 2016.
- 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.