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Expired Canadian patentCanada

Method and apparatus for link metric assignment in shortest path networks

CA 2124974 C · Owner: Ramakrishnan, Kajamalai Gopalaswamy · Inventors: Rodrigues, Manoel Alberto; Ramakrishnan, Kajamalai Gopalaswamy

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Abstract From the Canadian patent

The invention discloses a method and apparatus for assigning link "distance" metrics that result in near optimal routing for a network formed of nodes (routers) and links, where each link has a capacity associated with it and where, source-destination flows are given. The routing optimality is measured with respect to some objective function (e.g. average network delay).

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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 June 2, 1994 and granted August 25, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 2, 2014.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 2, 2016.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 2, 1994
GrantedAugust 25, 1998
Term endedJune 2, 2014
Patent numberCA 2124974 C
Classification (IPC)H04Q3/66 +1 more

Timeline

Timeline From CIPO dates

1995199719992001200320052007200920112013Application filedJune 2, 1994Patent grantedAug 25, 1998Term endedJune 2, 2014

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