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Expired Canadian patentCanada

Packet switching equipment and a packet switching method for controlling packet switched networks

CA 1292054 C · Owner: Sasaki, Ryoichi · Inventors: Hayashi, Kazuyuki; Sugano, Minoru; Hagiwara, Masayoshi

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

In order to enable an expansion of a packet switched network and a constitution change thereof to be readily achieved in a multistage switched network constitution, in a packet switched network including a packet data terminal, a packet switching equipment a PBX, a multiplexer, an LAN, a voice communication apparatus such as a telephone set, and a facsimile or in a linkage between switching modules in a packet switching apparatus, the basic switching modules called configuration units connected to the network are interconnected to each other to form a hierarchic tree structure of which the number of hierarchic levels can be selected depending on a size of the packet switched network. …

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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 12, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 12, 2008.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 13, 1988
GrantedNovember 12, 1991
Term endedNovember 12, 2008
Patent numberCA 1292054 C
Classification (IPC)H04L12/56

Timeline

Timeline From CIPO dates

1989199119931995199719992001200320052007Application filedMay 13, 1988Patent grantedNov 12, 1991Term endedNov 12, 2008

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