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Expired Canadian patentCanada

Self-routing network using optical gate array driven by control voltages coincidental with packet header pulses

CA 2055546 C · Owner: Nishio, Makoto · Inventors: Nishio, Makoto; Suzuki, Shuji

CIPO record

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Abstract From the Canadian patent

In an optical self-routing network, N optical splitters are associated respectively with N inlet terminals for splitting an optical signal from the associated inlet terminal into M replicas of the optical signal. M optical combiners, associated respectively with M outlet terminals combines N, optical signals incident thereon into a combined optical signal and couples it to the associated outlet terminal. M sets of N optical gates are connected between the N optical splitters and the M optical combiners. Each optical gate allows passage of an optical signal incident thereon when it timely coincides with an electrical signal applied thereto. A controller supplies a gate control electrical …

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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

  • Filed November 14, 1991 and granted February 2, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 14, 2011.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 14, 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.
FiledNovember 14, 1991
GrantedFebruary 2, 1999
Term endedNovember 14, 2011
Patent numberCA 2055546 C
Classification (IPC)H04Q1/39 +2 more

Timeline

Timeline From CIPO dates

1992199419961998200020022004200620082010Application filedNov 14, 1991Patent grantedFeb 2, 1999Term endedNov 14, 2011

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