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Expired Canadian patentCanada

A list management system, a list management method, a recording medium wherein a computer program for realizing the list management system is recorded and a packet exchange wherein the list management system is applied

CA 2249082 C · Owner: Murase, Tutomu · Inventors: Murase, Tutomu

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

To provide a list management system of the same effectiveness with the LRU method with smaller overhead of the CPU a list, management system comprises: a trigger generating means (14) for generating a trigger signal every time when a time interval is passed; counters (21) each corresponding to each of a plurality of processes (20) and counting a reference frequency of each of the processes (20); a list (24) of elements each corresponding to each of the processes (20) and connected with each other by way of pointer data; and a list maintenance means (23) for rearranging order of the elements according to count values of the counters in descending order of the count values when, the trigger …

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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 September 29, 1998 and granted April 2, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 29, 2018.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 29, 2020.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 29, 1998
GrantedApril 2, 2002
Term endedSeptember 29, 2018
Patent numberCA 2249082 C
Classification (IPC)G06F17/30 +2 more

Timeline

Timeline From CIPO dates

1999200120032005200720092011201320152017Application filedSep 29, 1998Patent grantedApril 2, 2002Term endedSep 29, 2018

Sources & verification

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