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Expired Canadian patentCanada

Supervisory and control system having dynamic significant change of values

CA 1231412 A · Owner: Mcc Powers · Inventors: Dougherty, Roderick J.

CIPO record

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Abstract From the Canadian patent

Abstract Of The Disclosure, A signal transmission system for intercommunication between multiple subsystems comprises a transmitter for selectively transmitting a characterization value of a data signal in response to a control stimulus. The system performs adjustments to provide a discriminant signal representing band limits with the discriminant signal value varying as a function of the previously transmitted characterization value of the data signal. A system control provides for comparison of a present characterization value to a previous characterization value of the data signal including, a means for selective transmission of the control stimulus when the difference between past and …

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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 January 12, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 12, 2005.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 15, 1983
GrantedJanuary 12, 1988
Term endedJanuary 12, 2005
Patent numberCA 1231412 A
Classification (IPC)G06G7/68 +1 more

Timeline

Timeline From CIPO dates

19841987199019931996199920022005Application filedMarch 15, 1983Patent grantedJan 12, 1988Term endedJan 12, 2005

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