Method for providing virtual dedicated access to an inter-exchange carrier
CA 2215587 C · Owner: At&T Corp. · Inventors: Weinstock, Alan M.; Lewis, David George; Morton, Leslie Ellen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Virtual dedicated access of telecommunication subscribers (12 14 and 16) to an, inter-exchange carrier (20) is provided by way of an intelligent local End Office switch (180) that routes calls either to the IXC or to a local End Office switch (18). The intelligent local End Office switch (180) advantageously serves to perform inter-exchange processing of calls, as required, for calls that originate with or terminate at, a, customer rather than automatically route calls to the IXC for such inter-exchange processing, as was previously required.
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 16, 1997 and granted April 4, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 16, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 16, 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.