Basic switching unit for an apparatus used to shuffle digital streams which have been multiplexed by time division of digital tributaries at different rates

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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 March 18, 1991 and granted September 20, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 18, 2011.
• A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 18, 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.