Optical repeated transmission method and system
CA 2022690 C · Owner: Nishimura, Eiichi · Inventors: Nishimura, Eiichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a system of optical repeated transmission having a signal transmission path for transmitting signal light and an optical repeater disposed in the signal transmission path, and directly amplifying the signal light the, amplification factor of the repeater is not dependent on the direction of polarization of the signal light that is input to it.
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 3, 1990 and granted July 5, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 3, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 3, 2012.
- 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.