Optical switch
CA 2069242 C · Owner: Alcatel N.V. · Inventors: Wischmann, Wiltraud; Kersten, Peter; Rehm, Werner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical switch serves to deflect an incident wave in a given, selected direction. Suited as part of an optical switch is a transparent material in which a three-dimensional diffraction pattern can be produced by applying an electric field and by which the direction of the wave can be changed. An optical switch according to the invention comprises a material with nonlinear optical properties in which the three-dimensional diffraction pattern is recorded. The material forms at least a single layer (2) overlying a substrate (1). Electrodes (3- 6) are provided; by applying an electric field to these electrodes the, diffraction pattern in the layer (2) can be changed. Part of the wave …
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 May 22, 1992 and granted April 20, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 22, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 22, 2014.
- 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.