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Expired Canadian patentCanada

System for monitoring status of plurality of repeaters

CA 1338448 C · Owner: Fujitsu Limited · Inventors: Yamauchi, Daiichiro

CIPO record

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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 system for monitoring the status of a plurality of repeaters located along a transmission line connecting two terminal stations, wherein data is transmitted between the two terminal stations through the plurality of repeaters, in the form of a multiframe consisting of a group of consecutive frames each of, the consecutive frames in the multiframe transmitting an address of the corresponding repeater, respectively and the status of each of the repeaters being written in the corresponding frame when each of the repeaters has received the corresponding one of the consecutive frames.

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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 July 9, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 9, 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.
FiledFebruary 6, 1989
GrantedJuly 9, 1996
Term endedJuly 9, 2013
Patent numberCA 1338448 C
Classification (IPC)H04B17/40 +2 more

Timeline

Timeline From CIPO dates

19901993199619992002200520082011Application filedFeb 6, 1989Patent grantedJuly 9, 1996Term endedJuly 9, 2013

Sources & verification

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