Central exchange
CA 1265228 C · Owner: Kruger, Johann Emil Wilhelm · Inventors: Kruger, Johann Emil Wilhelm; Jasmer, Wolgang Eberhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Central exchange. The central exchange according to the invention comprises at its input end a change-over arrangement having a change-over switch for each input line and a change-over arrangement of an identical structure having a change-over switch for each output line which, are controlled in parallel. Each change-over switch sequentially supplies from its output the channels of a frame of always a different input line. For each input line a data store and a control store are assigned to the change-over switch at the input end in a predeter-, mined sequence for each instant each data store storing, the words of all channels of always one input line but, always a different frame. …
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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
- Granted January 30, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 30, 2007.
- 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.