Channel switching unit for a telephone switching centre and switching arrangement utilising such units
CA 1061482 A · Owner: Thomson-Csf · Inventors: Deman, Pierre; Le Parquier, Guy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The switching unit comprises for two-way transmission two branches, each of which includes in series an input mixer a, channel filter and an output mixer, and two variable frequency digitally controlled carrier current generators the first of which feeds the input mixer of the first branch and the output mixer of the second branch, and the other of which feeds the output mixer of the first branch and the input mixer of the second branch. In a switching arrangement using such units a telephone channel can, be transferred from an incoming multiplexed group to an outgoing multiplexed group without any low-frequency stages by means of two units whose second generators receive a common frequency …
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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 August 28, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 28, 1996.
- 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.