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Expired Canadian patentCanada

Linear amplifier circuits

CA 1203291 A · Owner: Western Electric Company, Incorporated · Inventors: Ross, David G.

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

A linear amplifier circuit includes input (55) and output (32) signal ports and a pair of signal amplifying circuits (11,12). Each signal amplifying circuit couples an input signal from the input signal port to the output signal port. A bias supply (13,14,18,30,43,44,48,50) can be connected to the signal amplifying circuits for supplying bias currents thereto. The input and output signal ports are isolated from the bias supply without using capacitors or inductors.

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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 15, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 15, 2003.
  • 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 18, 1983
GrantedApril 15, 1986
Term endedApril 15, 2003
Patent numberCA 1203291 A
Classification (IPC)H03F3/34 +2 more

Timeline

Timeline From CIPO dates

1984198619881990199219941996199820002002Application filedMay 18, 1983Patent grantedApril 15, 1986Term endedApril 15, 2003

Sources & verification

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