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Expired Canadian patentCanada

Generation of vectors

CA 1206635 A · Owner: Desjardins, Francois G. · Inventors: Desjardins, Francois G.

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 vector generator includes a linear charge pump in the form of a DAC with a constant but variable current output that can charge a capacitor connected between the output and one of the input terminals of an operational amplifier. A second constant current generator having an output current one-half that of the maximum output current of the DAC and of opposite polarity also is provided for charging the capacitor the constant current generators being so connected to the capacitor that it can be charged either positively or negatively. A switching network controls whether the capacitor is charging or not depending on the state of the switching network. A second DAC with a constant but …

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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 June 24, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 24, 2003.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledFebruary 3, 1983
GrantedJune 24, 1986
Term endedJune 24, 2003
Patent numberCA 1206635 A
Classification (IPC)G09G1/00

Timeline

Timeline From CIPO dates

1984198619881990199219941996199820002002Application filedFeb 3, 1983Patent grantedJune 24, 1986Term endedJune 24, 2003

Sources & verification

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