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Expired Canadian patentCanada

Task scheduling mechanism for large data processing systems

CA 1289674 C · Owner: Jennings, Andrew Thomas · Inventors: Keller, John Allen; Jennings, Andrew Thomas

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Abstract From the Canadian patent

A task control mechanism (13) for maintaining a queue of ready or available processes linked together according to an assigned priority for a plurality of central processors (10) where the processors (10) may be assigned to the highest priority task when that processor is not busy executing some higher priority task. The task control mechanism (13) also includes a mechanism (26) for computing task priorities as new task are inserted into the queue or removed. The mechanism (13) also maintains an event table (20a) which is really a table of event designations to be allocated to different processes upon request where the requesting processes assign a particular function or "meaning" to the …

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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 September 24, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 24, 2008.
  • 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 14, 1986
GrantedSeptember 24, 1991
Term endedSeptember 24, 2008
Patent numberCA 1289674 C
Classification (IPC)G06F9/46 +1 more

Timeline

Timeline From CIPO dates

19871990199319961999200220052008Application filedOct 14, 1986Patent grantedSep 24, 1991Term endedSep 24, 2008

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