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Expired Canadian patentCanada

Interfacing control circuit with active circuit charge or discharge

CA 1331214 C · Owner: Lee, Kun-Ming · Inventors: Hwang, Ching-Dong; Lee, Kun-Ming

CIPO record

Overview

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

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Abstract From the Canadian patent

An interfacing control circuit having a buffer an, inverter, an OR gate and delay means which can be, utilized in digital systems for communication handshaking such that a buffer output current will actively flow through line stray capacitance to thereby greatly reduce the rise time from a LOW state to a HIGH state, or charges in the line stray capacitance will actively discharge through the buffer means if a negative logic mode is used thereby enabling a great reduction in fall time from a HIGH state to a LOW state resulting in a much faster and efficient digital system.

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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 August 2, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 2, 2011.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 5, 1989
GrantedAugust 2, 1994
Term endedAugust 2, 2011
Patent numberCA 1331214 C
Classification (IPC)H03K19/00 +2 more

Timeline

Timeline From CIPO dates

19901993199619992002200520082011Application filedJan 5, 1989Patent grantedAug 2, 1994Term endedAug 2, 2011

Sources & verification

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