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Expired Canadian patentCanada

Duplicated memory system having status indication

CA 1102007 A · Owner: Northern Telecom Limited · Inventors: Sood, Prem L.; Stewart, Charles G.

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Abstract From the Canadian patent

Abstract of the Disclosure, A fully duplicated memory system for a single central processing unit (CPU) is disclosed. The memory system comprises a primary and a secondary control unit and a primary memory bank and a secondary memory bank. Each memory bank comprises one memory controller and a plurality of memory modules (e.g. six memory modules). Each memory module stores a plurality of binary words in distinct addressable storage locations with a unique address code defining both one distinct addressable storage location in a memory module in the first memory bank and one distinct addressable storage location in a memory module in the second memory bank. A random access memory (RAM) …

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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 May 26, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 1998.
  • 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 15, 1979
GrantedMay 26, 1981
Term endedMay 26, 1998
Patent numberCA 1102007 A
Classification (IPC)G06F13/00 +2 more

Timeline

Timeline From CIPO dates

1980198219841986198819901992199419961998Application filedMay 15, 1979Patent grantedMay 26, 1981Term endedMay 26, 1998

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