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Expired Canadian patentCanada

Subscriber rf telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of rf channels

CA 1307064 C · Owner: Interdigital Technology Corporation · Inventors: Morley, Steven A.; Paneth, Eric; Handzel, Mark J.

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Abstract From the Canadian patent

A system for the wireless transmission of multiple information signals utilizing digital time division circuits between a base station and a plurality of subscriber stations. The subscriber stations may be fixed or movable. The number of time division circuits is determined by the transmission quality of the signals. The base station is interconnected with an external information network which, may be analog and/or digital. The information signals are selected from the group consisting of voice, data, facsimile, video, computer and instrumentation signals. The modulation level of the signals and the power applied to the system are adjusted in accordance with signal error detection in the …

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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 September 1, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 1, 2009.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 6, 1988
GrantedSeptember 1, 1992
Term endedSeptember 1, 2009
Patent numberCA 1307064 C
Classification (IPC)H04J3/16 +2 more

Timeline

Timeline From CIPO dates

1989199219951998200120042007Application filedSep 6, 1988Patent grantedSep 1, 1992Term endedSep 1, 2009

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.