Connections between a toll network and multiple local networks
CA 2211524 C · Owner: American Telephone And Telegraph Company · Inventors: Garoutte, Dana Lee; Akinpelu, Akinwale Ademola; Bhagat, Promod Kumar
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 method of routing a call from an exchange carrier (IXC) to one of a plurality of local exchange carriers. In accordance with the present invention a called party of the call is identified by an office code that is shared by subscribers of the plurality of local exchange carriers. The method is comprised of the steps of accessing a data base to determine an identity of a preferred terminating local exchange carrier for the called party of the call and routing the call to an IXC egress switch serving the preferred carrier for the code.
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 December 8, 1994 and granted January 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 8, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 8, 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.