Method for assembling optical isolator and method for measuring isolation
CA 2130873 C · Owner: Yui, Dai · Inventors: Hirai, Shigeru; Yui, Dai; Semura, Shigeru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for assembling an optical isolator comprises a step for constructing a measuring system in which a light source, a lens system, a polarizer an analyzer, and, a light receiver are arranged in this order and light, projected from the light source and then transmitted through the lens system, the polarizer and the analyzer, is received by the light receiver; a step for arranging optical elements for constituting a main body of the optical isolator between the polarizer and the analyzer; a step for measuring a maximum value and a minimum value in levels of the light received by the light receiver while the analyzer is rotated, thereby calculating a ratio of the minimum value to the …
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 25, 1994 and granted February 4, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 25, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 25, 2016.
- 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.