Optical coupler
CA 2065304 C · Owner: Faulkner, David Wynford · Inventors: Faulkner, David Wynford; Smith, Philip John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A reflective star coupler for a distributed switch optical network for narrow band and broad band broadcast communication comprises one port (20a) terminated in a reflective surface or device (22) a signal amplifier (24) and/or filter is disposed in the path between the port (20a) and the reflective device (22) to reintroduce the light from that port into the coupler in an amplifier state or selectively according to wavelength. The amplifying device may be a semiconductor laser having a reflective coating on one face thereof.
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 14, 1990 and granted July 13, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 14, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 14, 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.