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Expired Canadian patentCanada

Pseudo-status signal generator

CA 1298673 C · Owner: Mitsubishi Denki Kabushiki Kaisha · Inventors: Okura, Makoto

CIPO record

Overview

Drawings and full text

Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

In a pseudo-status signal generator interposed between a main device in which a ready state is always maintained and an input/output requesting device adapted to produce a predetermined input/output request to the main device characterized to alternatively repetitively produce a status signal representing a ready state and a status signal representing a busy state to the input/output requesting device whenever a status request is output from the input/output requesting device thereby, alternatively repetitively producing the status signal representing the ready state and the status signal representing the busy state to the input/output requesting device whenever the status request is output …

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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 April 7, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 7, 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 19, 1987
GrantedApril 7, 1992
Term endedApril 7, 2009
Patent numberCA 1298673 C
Classification (IPC)G06F13/14

Timeline

Timeline From CIPO dates

19881991199419972000200320062009Application filedMay 19, 1987Patent grantedApril 7, 1992Term endedApril 7, 2009

Sources & verification

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