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Expired Canadian patentCanada

Waveshaping transversal filter and method utilizing the same for data transmission over coaxial cable

CA 2070811 C · Owner: Cochran, William T. · Inventors: Cochran, William T.; Yudichak, Joseph R.; Upp, Daniel C.

CIPO record

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

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Abstract From the Canadian patent

A transversal filter (20) has a plurality of variable delay lines each having multiple voltage controlled delay stages in series with one of the variable delay lines having a clock input (54) and the other , variable delay lines having data signal inputs. A phase comparator (150) is coupled to the output of two non-adjacent stages of the variable delay lines having the clock input. A feed-back circuit (25) is coupled to the comparator and provides voltage signals to the voltage controlled delay stages of all of the variable delay lines, such that adjacent stages in a particular delay line are delayed in time equal fractions of a clock cycle from each other, and so that all delay lines …

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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 November 26, 1990 and granted August 8, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 26, 2010.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 26, 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.
FiledNovember 26, 1990
GrantedAugust 8, 2000
Term endedNovember 26, 2010
Patent numberCA 2070811 C
Classification (IPC)H03H15/00

Timeline

Timeline From CIPO dates

1991199319951997199920012003200520072009Application filedNov 26, 1990Patent grantedAug 8, 2000Term endedNov 26, 2010

Sources & verification

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