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Expired Canadian patentCanada

Microprocessor architecture with integrated interrupts and cycle steals prioritized channel

CA 1100643 A · Owner: International Business Machines Corporation · Inventors: Marenin, George B.

CIPO record

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Abstract From the Canadian patent

Abstract, A computing system architecture includes a central processing unit having a channel, arithmetic and logic unit a plurality of working, registers, and control logic; a plurality of local storage registers; a main storage; an executable control store; one or more input/output devices; and a multiplexed cycle steal and interrupt request common poll bus. The storage and input/output devices communicate with and are controlled by the central processing unit over a looped or unidirectional, bus and control channel including a bus in a bus out, an address and, control bus and a plurality of control lines. Bus out is operated to address the executable control store and main storage and to …

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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 5, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 5, 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.
FiledOctober 6, 1977
GrantedMay 5, 1981
Term endedMay 5, 1998
Patent numberCA 1100643 A
Classification (IPC)G06F13/00 +2 more

Timeline

Timeline From CIPO dates

1978198119841987199019931996Application filedOct 6, 1977Patent grantedMay 5, 1981Term endedMay 5, 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.