Internet telephony gateway
CA 2180685 C · Owner: Zarlink Semiconductor Inc. · Inventors: Quon, Wynn
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for enabling the establishment of telephone calls between a packet switched network carrying data packets and a circuit switched network carrying telephone signals, comprises a first interface unit for connection to the circuit switched network; a second interface unit for connection to the packet switched network; a device for receiving signals at said first interface and converting them to data packets for transmission over the packet switched network and vice versa; and a processor for determining destination information from incoming signals or data packets on one network and setting up a call to a destination on the other network in response to the destination information.
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 July 8, 1996 and granted September 9, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 8, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 8, 2018.
- 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.