Charger/detector for cordless telephones
CA 2108225 C · Owner: Mitel Networks Corporation · Inventors: Butler, Chris; Bligh, Peter; Meier, Rolf G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a subscriber presence detector system comprised of a switching system for connecting calls to and from a plurality of lines a, person presence detector connected to a line for, providing an indication to the switching system that a person is adjacent or not adjacent the detector and, apparatus for routing calls to the line in the event an indication has been received by the switching system that a person is adjacent the line.
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 October 12, 1993 and granted July 22, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 12, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 12, 2015.
- 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.