(ds) transmitter
CA 1260641 A · Owner: Northern Telecom Limited · Inventors: Mony, Georges E.; Heynen, Jan; Kayser, Larry S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A communication system for connecting a telephone switching office to a data processing center is described. A telephone trunk line from the switching office carries data which is digitally encoded and may be in a compressed format for, example mu-law PCM, and which is derived from remote data terminals. A novel type of modem is connected between the trunk and the data processing center. This is a direct synthesis device which converts the modulated digital data directly to a non-modulated digital format readable by the data processing center and for digital data originating at the data processing center pro-, duces modulated digital data which is transmitted along the trunk to the …
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
- Granted September 26, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 26, 2006.
- 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.