Method and device for measuring an electrical alternating quantity with temperature compensation
CA 2173142 C · Owner: Niewisch, Joachim · Inventors: Menke, Peter; Bosselmann, Thomas; Niewisch, Joachim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method and device for measuring an electrical alternating quantity with temperature compensation, In a sensor element (3) the polarization of polarized, measuring light (L) is changed as a function of the alternating quantity (X). After passing through the sensor element (3) the, measuring light (2) is split into two differently linearly polarized partial light signals (LS1, LS2) which are converted, into electrical intensity signals S1 and S2. An intensity-normalized signal P = (S1-S2)/(S1+S2) is then formed. A temperature-compensated measured signal S = (a*PAC+b*1)/ (c*PDC +d*1) is derived from the alternating signal component PAC and the direct signal component PDC of this …
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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 September 22, 1994 and granted November 14, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 22, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 22, 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.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.