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Expired Canadian patentCanada

Pair division multiplexer for digital communications

CA 2120697 C · Owner: Pmc-Sierra Ltd. · Inventors: Little, Vernon Robert

CIPO record

Overview

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

For use in a transmission system in which an input data stream is transmitted in plural data streams each at a fraction of the input data stream rate and plural clock stream pairs each at the fraction of the input data clock rate a receiver, comprised of apparatus for receiving the plural data streams apparatus for determining frame timing differences between frame signals contained in each of the received plural data streams apparatus for varying the timing of one received data stream relative to another whereby their relative timing is adjusted apparatus for combining the timing adjusted plural data streams into an output data stream having a similar data stream rate as the input data …

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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 April 6, 1994 and granted August 10, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 6, 2014.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 6, 2016.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 6, 1994
GrantedAugust 10, 1999
Term endedApril 6, 2014
Patent numberCA 2120697 C
Classification (IPC)H04L7/02 +2 more

Timeline

Timeline From CIPO dates

1995199719992001200320052007200920112013Application filedApril 6, 1994Patent grantedAug 10, 1999Term endedApril 6, 2014

Sources & verification

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