Fault recovery system of a ring network
CA 2041789 C · Owner: Yamashita, Haruo · Inventors: Takizawa, Yuji; Yamashita, Haruo; Yamaguchi, Kazuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fault recovery system of a ring network based on a synchronous transport module transmission system, having a fault data writing unit for writing when an input fault is detected by a node fault data, in a predetermined user byte in an overhead of a frame flowing through both a working line and a protection line running in opposite directions to each other and, by detecting the fault data in a supervision node or a node just before the fault position, the supervision node or the node just before the fault position excecutes a loopback operation.
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 May 3, 1991 and granted August 4, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 3, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 3, 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.
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.