Optical voltage and electric field sensor based on the pockels effect
CA 2125395 C · Owner: Englund, Marja · Inventors: Englund, Marja
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention concerns an optical voltage/electric field sensor that comprises crystal (3) the distribution of refractive index of which depends on electric field wires (7) for leading the electric field onto the surface of the crystal (3) polarizers (1.4), aligned on both sides of crystal (3) and phase shift plate (2) to detect changes in the distribution of the refractive index and, optical fibres (20) for routing light through the construction formed by polarizers (1,4) and the crystal (3). In accordance with the invention the inner cavity surrounding crystal (3) of the sensor is filled with a transparent material (5) that has low extinction coefficient and dielectric constant, like …
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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 November 30, 1992 and granted July 13, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 30, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 30, 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.