Multi room telephone transmitter
CA 2082610 A1 · Owner: Lynch, David Nicholas · Inventors: Lynch, David Nicholas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention is called, "Multi Room Telephone Transmitter". It allows the user to monitor a remote area, or several rooms in a building via the telephone line. It incorporate means for switching from one monitored room to the next from the calling telephone. Specification Room monitors, or infinity transmitters as they are often called have been available to the public since the nineteen sixties. The only Canadian Patent number 766,330 for an infinity transmitter was issued to a German designer on the 29/8/67 it enables a home owner, for example, to monitor his or her home from any where in the city province, or globe through direct dialling. There are various electronic designs of …
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 November 10, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 10, 2014.
- 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.