Optical signal transmission network
CA 2129012 A1 · Owner: Shipley, Simon Paul · Inventors: Shipley, Simon Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A means for simplifying fault location in an optical signal transmission network in which a main optical fibre is divided into a plurality of branch circuits, comprises optical time domain reflectrometry (OTDR) equipment for transmitting an output signal along the main fibre, and for each branch circuit means for causing the signal returned to the OTDR equipment from the branch to be modified in a manner unique to that branch.
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 February 5, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 5, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 5, 2015.
- 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.