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Expired Canadian patentCanada

Technique for producing an expert system for system fault diagnosis

CA 2017970 C · Owner: Lirov, Yuval V. · Inventors: Yue, On-Ching; Lirov, Yuval V.

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

Abstract, The present invention relates to a technique for operation on a computer for developing the knowledge base for ultimately providing very fast and cost-efficient fault diagnosis systems. The present technique uses a effective hierarchy of rules where at a first level are rules which allow the arrangement of the system under test to bedecomposed into a hierarchy of sequential and parallel subsystems. At the second level are rules that generate the efficient testing rules for each pure subsystem. The second level rules can be compared to a node evaluation function in a typical problem of searching a graph to select the best node for expansion from a current list of candidate nodes, …

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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 May 31, 1990 and granted May 24, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 31, 2010.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 31, 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.
FiledMay 31, 1990
GrantedMay 24, 1994
Term endedMay 31, 2010
Patent numberCA 2017970 C
Classification (IPC)G06F11/34 +1 more

Timeline

Timeline From CIPO dates

1991199319951997199920012003200520072009Application filedMay 31, 1990Patent grantedMay 24, 1994Term endedMay 31, 2010

Sources & verification

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