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Expired Canadian patentCanada

Fm tvro receiver with improved oscillating limiter

CA 1249634 A · Owner: Cincinnati Microwave, Inc. · Inventors: Washburn, Clyde, Jr.

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 improved FM receiver is disclosed incorporating improved oscillating limiter circuitry having an electrically tunable bandpass filter which is phase modulated by the baseband signal the phase of which has been advanced in accordance with the formula: wherein td1 equals the time delay through the limiter td2 equals the time delay through the feedback filter td3 equals the time delay through the demodulator and fn equals the frequency of the respective baseband components.

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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 January 31, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 31, 2006.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 25, 1986
GrantedJanuary 31, 1989
Term endedJanuary 31, 2006
Patent numberCA 1249634 A
Classification (IPC)H03G11/06

Timeline

Timeline From CIPO dates

1987198919911993199519971999200120032005Application filedAug 25, 1986Patent grantedJan 31, 1989Term endedJan 31, 2006

Sources & verification

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