A method and system for extending the directory number of a terminal
CA 2238759 A1 · Owner: Cai, De D. · Inventors: Cai, De D.; Iyengar, Laxminarayana Gopal; Kulkarni, Sanjay
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and system are disclosed for extending the directory number of a terminal. The invention allows service providers to provide a service which uses an existing subscriber directory number and effectively extends it to include one or more other directory numbers. To the subscriber the terminals , associated with the other directory numbers effectively look like virtural extensions. The method and system provide this flexibility without requiring any additional personal numbers being assigned to the subscriber. The subcriber can choose to have all incoming calls to a DN of one of their existing terminals alert or ring one or more other terminals having a different DN. The …
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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 November 4, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 4, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 4, 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.