Transmission line switching devices capable of switching to a redundant system when a failure occurs in the system path
CA 2076996 C · Owner: Naka, Yoshihiro · Inventors: Naka, Yoshihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A transmission line switching device built into each of a plurality of nodes which connect a transmission line in a ring network configuration. The switching device has a matrix switch 30 for changing the conductive state of a node such that signals being transmitted through the ring network are either transmitted through the node or terminated at the node. Loopback switches which are separated from the matrix switch change the conductive state of the node such that a loopback connection is configured to recover the transmission path of the ring network when a failure occurs in a section of the ring network.
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 August 27, 1992 and granted December 7, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 27, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 27, 2014.
- 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.