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Expired Canadian patentCanada

Data communication system having channel switching means

CA 1338741 C · Owner: Suzuki, Eiji · Inventors: Suzuki, Eiji

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 data communication system which operates by the use of a main channel, and also a protection channel to back up the main channel using a channel switching means, between a receiver and a transmitter. A receiver side channel switching means includes a delay means for delaying the main channel data. A transmitter side channel switching means includes a delay means for delaying the protection channel data when switching channels when a transmission fault occurs. The thus delayed data is effective for preventing a stoppage of data flow even in the event of a sudden transmission fault.

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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 November 26, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 26, 2013.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 31, 1989
GrantedNovember 26, 1996
Term endedNovember 26, 2013
Patent numberCA 1338741 C
Classification (IPC)H04B1/74

Timeline

Timeline From CIPO dates

19901993199619992002200520082011Application filedJan 31, 1989Patent grantedNov 26, 1996Term endedNov 26, 2013

Sources & verification

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