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Expired Canadian patentCanada

Radio link architecture for wireless communication systems

CA 2021382 C · Owner: Northern Telecom Limited · Inventors: Sandler, Howard M.; Steer, David G.; Strawczynski, Leo

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 July 17, 1990 and granted July 14, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 17, 2010.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 17, 2012.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 17, 1990
GrantedJuly 14, 1998
Term endedJuly 17, 2010
Patent numberCA 2021382 C
Classification (IPC)H04B7/26 +2 more

Timeline

Timeline From CIPO dates

1991199319951997199920012003200520072009Application filedJuly 17, 1990Patent grantedJuly 14, 1998Term endedJuly 17, 2010

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