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Expired Canadian patentCanada

Method of automated proving for unrestricted first-order logic

CA 2133699 C · Owner: Bull S.A. · Inventors: Billon, Jean-Paul

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Abstract From the Canadian patent

The method of automated proving for unrestricted first-logic to test the satisfiability of clause sets describing an industrial system applies the instance generation rule (IG)~~ ~.sigma. where ~ is a term .sigma. a substitution and ~.sigma. an instance of ~ yielded by the substitution .sigma. and is characterized in that defining an instance subtraction as the subtraction of the instance ~.sigma. from ~ resulting in a generalized term which is a triplet <~ .sigma. ~> where ~ is a finite set of standard substitutions {.lambda.1 ... .lambda.n} and defined by GE(<~, .sigma. ~>) = GE (~.sigma.)~ - GE ({~.lambda.1 ... ~.lambda.n}) the method further applies an instance subtraction combined with …

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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 October 5, 1994 and granted September 7, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 5, 2014.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 5, 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.
FiledOctober 5, 1994
GrantedSeptember 7, 1999
Term endedOctober 5, 2014
Patent numberCA 2133699 C
Classification (IPC)G06F9/44 +2 more

Timeline

Timeline From CIPO dates

1995199719992001200320052007200920112013Application filedOct 5, 1994Patent grantedSep 7, 1999Term endedOct 5, 2014

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