Power feeding system for an optical transmission system
CA 2057657 C · Owner: Fujitsu Limited · Inventors: Tanoue, Toshiyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a power feeding system for an optical transmission system used as an optical submarine cable system formed by at least two cable landing stations a, power feeding cable provided between the cable landing stations, and a plurality of optical repeaters each provided at predetermined intervals on the optical submarine cable; the power feeding system includes: at least one constant voltage source provided for one end or both ends of the power feeding cable to apply an electric potential between the power feeding cable and the ground and the constant voltage source provided in the cable landing station; and each optical repeater connected between the power feeding cable and the ground to …
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 December 13, 1991 and granted January 5, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 13, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 13, 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.