Redirection of calls to ported directory numbers in telephone networks
CA 2211489 C · Owner: Bell-Northern Research Ltd. · Inventors: Martinez, Edgar; Giuhat, Adrian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a telephone network having a plurality of network nodes each having a , unique, network address and using out-of band signalling for call setup and routing a , method, is provided for the routing of calls to a "ported" directory number which has been ported, from a donor network node to a recipient network node. The method comprises the, steps of (i) routing the call, using the ported directory number as the Called Party, Number, from an originating network node towards the donor network node; (ii) intercepting the call at an intermediate network node between the originating network, node and the donor network node through which intermediate network node calls to the, donor network …
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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 July 25, 1997 and granted May 30, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 25, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 25, 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.