Basic rate interface
CA 2047641 C · Owner: Mitel Corporation · Inventors: Gancarcik, Ed
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A digital switching system connectable to a public telecommunications network via any one of a plurality of digital circuits and comprising a control unit including a system clock and a system bus for carrying data through the system, an arrangement for synchronizing the system clock with a selected digital circuit, comprising means for detecting a network synchronization signal on the digital circuit, means for routing the detected synchronization signal directly to the system clock, and means for bringing the system clock into synchronization with the detected synchronization signal routed thereto.
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 23, 1991 and granted January 11, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 23, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 23, 2013.
- 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.