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Expired Canadian patentCanada

Microprocessor with selective cache memory

CA 1289265 C · Owner: American Telephone And Telegraph Company · Inventors: Boddie, James Riley

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

Abstract, A signal processing system is described which has a processor, a random access memory for storage of data a read-, only memory for storage of both coefficients and instructions and a selective cache memory for storage of instructions that require high performance, and their associated buses. Instructions selected by the program are stored in the selective cache memory during their first call from the readonly memory for use later in the program. An address sequencer can be used as a control unit for executing the data stored in the selective cache memory. It generates a sequence of addresses repetitively, counts the number of iterations of the sequence of addresses, and informs …

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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 17, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 17, 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.
FiledAugust 27, 1987
GrantedSeptember 17, 1991
Term endedSeptember 17, 2008
Patent numberCA 1289265 C
Classification (IPC)G06F12/08 +1 more

Timeline

Timeline From CIPO dates

1988199119941997200020032006Application filedAug 27, 1987Patent grantedSep 17, 1991Term endedSep 17, 2008

Sources & verification

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