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Expired Canadian patentCanada

Switched capacitor comparator

CA 1163331 A · Owner: American Microsystems, Inc. · Inventors: Haque, Yusuf A.

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

An operational amplifier is designed to eliminate the effects of inherent voltage affects when used as a voltage comparator, while maintaining a high slew rate and a fast response time by providing a feedback capacitor which can be connected and disconnected between the output terminal and the noninverting current mirror input leg.

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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 March 6, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 6, 2001.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 13, 1981
GrantedMarch 6, 1984
Term endedMarch 6, 2001
Patent numberCA 1163331 A
Classification (IPC)H03F3/45 +2 more

Timeline

Timeline From CIPO dates

1982198419861988199019921994199619982000Application filedJuly 13, 1981Patent grantedMarch 6, 1984Term endedMarch 6, 2001

Sources & verification

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