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Expired Canadian patentCanada

Power supply circuit for a data processor

CA 1135420 A · Owner: At&T Technologies, Inc. · Inventors: Kutzavitch, Walter G.; Christian, Ronald W.

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

The present invention relates to a power supply circuit for a data processor to which a data input circuit is connected. Operation of the data input circuit provides an input to the data processor. The power supply circuit includes a power up circuit that is latched on responsive to the operation of the data input circuit. When latched on the power supply supplies power from a power source to the processor. The power up circuit is comprised of a single pair of complementary transistors arranged so that an output electrode of each transistor is connected to an input electrode of the other transistor. A first of the transistors has its third electrode adapted to be connected to the power …

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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 November 9, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 9, 1999.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 9, 1982
GrantedNovember 9, 1982
Term endedNovember 9, 1999
Patent numberCA 1135420 A
Classification (IPC)G06F1/00

Timeline

Timeline From CIPO dates

198319851987198919911993199519971999Application filedMarch 9, 1982Patent grantedNov 9, 1982Term endedNov 9, 1999

Sources & verification

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