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Expired Canadian patentCanada

Memory test method and apparatus

CA 1304164 C · Owner: Smelser, Donald W. · Inventors: Smelser, Donald W.

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Abstract From the Canadian patent

A method and apparatus for memory testing is described. A first pattern of data is written into the memory in a pseudo-random address sequence determined by an address generator. The first pattern is read from the memory and checked for any error. A second pattern that is the complement of the first pattern is written into the memory in a pseudorandom address sequence determined by the address generator. The second pattern is read from the memory and checked for any errors. A third pattern of data is written into the memory in the pseudo-random address sequence determined by the address generator. The third pattern of data has the effect of complementing respective check bits which are 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 June 23, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 23, 2009.
  • 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 13, 1988
GrantedJune 23, 1992
Term endedJune 23, 2009
Patent numberCA 1304164 C
Classification (IPC)G11C29/00 +2 more

Timeline

Timeline From CIPO dates

1989199219951998200120042007Application filedMay 13, 1988Patent grantedJune 23, 1992Term endedJune 23, 2009

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