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Expired Canadian patentCanada

Color television signal sampling clock phase control system

CA 1294701 C · Owner: Nec Corporation · Inventors: Suzuki, Norio

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 sampling clock phase control system includes at a transmitter side, a circuit for generating a first phase reference signal phase-locked with a color burst of an input color television signal, and a multiplexer for multiplexing the color television signal encoded by a first sampling clock and the first phase reference signal and outputting the multiplexed signal to a channel. The control system includes, at a receiver side a circuit for, generating a second phase reference signal phase-locked with a color burst of a decoded color television signal a, phase comparator for comparing the phases of the first and second phase reference signals, and a circuit which is feedback-controlled by an …

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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 21, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 21, 2009.
  • 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 19, 1988
GrantedJanuary 21, 1992
Term endedJanuary 21, 2009
Patent numberCA 1294701 C
Classification (IPC)H04N11/04 +2 more

Timeline

Timeline From CIPO dates

1989199219951998200120042007Application filedAug 19, 1988Patent grantedJan 21, 1992Term endedJan 21, 2009

Sources & verification

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