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Expired Canadian patentCanada

Interconnection networks

CA 1236202 A · Owner: National Research Development Corporation · Inventors: Cripps, Martin D.; Field, Anthony J.

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 serial switched interconnection network comprises several stages of switching units each having a plurality of source ports and destination ports interconnected so that any source port of the first stage can be connected to any destination port of the final stage by operation of switching units in successive stages. Connections are by shared data and control paths each of which paths may comprise a single line or multiple lines and each switching unit when switched to along a path sends a request back up that path for sufficient data signals to operate the switching unit initiating the request. The setting up of a path through the network is thus stage-by-stage asynchronously.

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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 May 3, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 3, 2005.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 1, 1984
GrantedMay 3, 1988
Term endedMay 3, 2005
Patent numberCA 1236202 A
Classification (IPC)H04Q3/00 +2 more

Timeline

Timeline From CIPO dates

1985198819911994199720002003Application filedNov 1, 1984Patent grantedMay 3, 1988Term endedMay 3, 2005

Sources & verification

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