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Expired Canadian patentCanada

Radio link architecture for wireless communication systems

CA 2075860 C · Owner: Sandler, Howard M. · Inventors: Steer, David G.; Sandler, Howard M.; Plett, Gregory L.

CIPO record

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Abstract From the Canadian patent

An improved radio link architecture for digital wireless communication systems which is characterized by the use of information and signalling channels on a number of RF carriers, thereby providing common signalling channels for call set-up and control functions. A first group of RF carriers are allocated as traffic channels between base stations and subscriber terminals. Each RF carrier in the first group comprises at least one traffic channel. A second group of RF carriers is allocated for providing common signalling channels between the base stations and the subscriber terminals. Each RF carrier having common signalling channels operates in time division multiple access mode, and each …

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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

  • Filed August 12, 1992 and granted July 13, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 12, 2012.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 12, 2014.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 12, 1992
GrantedJuly 13, 1999
Term endedAugust 12, 2012
Patent numberCA 2075860 C
Classification (IPC)H04J4/00 +1 more

Timeline

Timeline From CIPO dates

1993199519971999200120032005200720092011Application filedAug 12, 1992Patent grantedJuly 13, 1999Term endedAug 12, 2012

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