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Expired Canadian patentCanada

Supervisory circuit for a programmed processing unit

CA 1252899 A · Owner: Westinghouse Electric Corporation · Inventors: Engel, Joseph C.

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Abstract From the Canadian patent

34 52,555, ABSTRACT OF THE DISCLOSURE, A supervisory circuit for use in an integrated circuit to supervise the program execution of a processing unit is disclosed. The processing unit generates a restart signal at a particular duty cycle under proper program execution conditions and at an undesirable duty cycle under improper program execution conditions. The supervising circuit includes a capacitive or like circuit element for converting the restart signal into a signal representative of the duty cycle thereof and compares the generated signal to a reference window comprising upper and lower reference values. Should the generated signal exceed the boundaries of the window reference a, …

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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 18, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 18, 2006.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 16, 1986
GrantedApril 18, 1989
Term endedApril 18, 2006
Patent numberCA 1252899 A
Classification (IPC)G06F11/28 +2 more

Timeline

Timeline From CIPO dates

1987198919911993199519971999200120032005Application filedApril 16, 1986Patent grantedApril 18, 1989Term endedApril 18, 2006

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