Method for monitoring fiber optic cables
CA 2212465 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
Possible microbending of individual fibers (14 1,and 14 2) within a fiber optic cable (12) is detected by monitoring each fiber as well as each piece of equipment (16 1 16 2, 18 1, and 18 2) connected to it. Should there exist multiple failed fibers under the condition that the equipment pieces associated with each failed fiber are operational; then a possible microbending condition is signaled.
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 7, 1997 and granted November 14, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 7, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 7, 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.