Telecommunications multiplexer
CA 2306900 A1 · Owner: Bullington, Thomas E. · Inventors: Morris, Matthew D.; Grobaski, Kenneth C.; Clark, Phillip D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A multiplexer device (42) for multiplexing and demultiplexing signals between a low-speed network including 28 DSX-1 signals (22) and a relatively higher speed network including a DS-3 signal (24). The multiplexer device (42) includes 7 quad DSX-1 cards and 1 spare card. The spare card is connected to the other 7 DSX-1 cards in a fashion that allows the spare card to automatically be switched in for one of the DSX-1 cards or to allow interface electronics on the spare card to replace selected ones of the interface electronics on various different DSX-1 cards simultaneously. A pair of controller cards, a primary card and a secondary card perform the M1-3 , multiplexing and …
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 November 3, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 3, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 3, 2020.
- 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.