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Expired Canadian patentCanada

Receiver for digital signals

CA 1210473 A · Owner: At&T Teletype Corporation · Inventors: Ollendick, Gary B.

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

A digital receiver includes a differential amplifier providing data signal and a control signal. The level of the control signal is related to the average level of the data signal. A slicing circuit includes series connected transistors, the gates of which receive the data signal. A third transistor is connected to provide hysteresis to the slicing circuit and a fifth, transistor is connected in parallel with the third transistor. The control electrode of the transistor receives the control signal from the differential amplifier.

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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 26, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 26, 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.
FiledMarch 13, 1985
GrantedAugust 26, 1986
Term endedAugust 26, 2003
Patent numberCA 1210473 A
Classification (IPC)H04L25/02 +2 more

Timeline

Timeline From CIPO dates

198619881990199219941996199820002002Application filedMarch 13, 1985Patent grantedAug 26, 1986Term endedAug 26, 2003

Sources & verification

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