Alternate ring restoration technique
CA 2201191 C · Owner: At&T Corp. · Inventors: Eslambolchi, Hossein
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Traffic in a multiple ring transmission system is advantageously routed via alternate, rings should a ring fail. Upon the failure of a ring a hunt is first , undertaken to establish the available restoration capacities within the rings. Next a selected set of , available restoration capacities is reserved (selected) to optimize the transmission of traffic between a destination, node and an origin node. The selected set of restoration capacities are then cross-connected to, route traffic between the origin and destination nodes.
Read the whole patent
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 March 27, 1997 and granted November 14, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.