Method of call screening
CA 2232168 A1 · Owner: Mitel Corporation · Inventors: Quon, Wynn
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of call screening comprising, receiving a call to a subscriber directory number determining a calling directory number of the call checking a first list of calling directory numbers to be affected by a screen and a second list of times during which said directory numbers are to be blocked or permitted through the screen to determine whether a call incoming from the calling directory number should be blocked at a real time contained within the times and, completing the call to a line associated with the subscriber directory number in the event the call is not to be blocked at the real time of the call.
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 March 16, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 16, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 16, 2020.
- 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.