Optical magnetic field sensor
CA 2089943 C · Owner: Noda, Masaki · Inventors: Okajima, Hisakazu; Noda, Masaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical magnetic field sensor which can precisely measure a magnetic field strength without measurement errors caused by temperature change is provided. It comprises a light source, a polarizer, a Faraday element an analyzer, a, first light beam-receiving element a first calculation, circuit, a second light beam-receiving element a second, calculation circuit, and a third calculation circuit. The light beam emitted from the light source is passed through the polarizer, the Faraday element and the analyzer in sequence. An S polarized light beam after passing through the analyzer is passed through the first light beam-receiving element and an output signal therefrom is calculated in the …
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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 February 19, 1993 and granted November 11, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 19, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 19, 2015.
- 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.