Wdm ring transmission system having two hubs
CA 2301915 C · Owner: Koehler, Steffen D. · Inventors: Koehler, Steffen D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A WDM ring transmission system is provided having two hubs. Identical groups of optical signals for transmission along the ring are input to both hubs, but one of the hubs includes optical switches for selectively passing one of the groups of optical signals to the WDM ring. Accordingly, if a fault occurs in one of the network-hub connections or one of the hubs becomes defective, the switches couple optical signals from the operational hub to the WDM ring. In addition, optical signals emitted by nodes coupled to the WDM ring are output from both hubs thereby insuring that signals can be output from and , input to, the ring even if one of the hubs fails.
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 June 10, 1999 and granted March 15, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 10, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 10, 2021.
- 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.