Arrangement for ascertaining values of electric quantities which are derivable from measured values of at least two electric input quantities of the arrangement
CA 2029936 A1 · Owner: De Vries, Jacob · Inventors: De Vries, Jacob; Lienhard, Heinz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
17, Abstract of the Disclosure, An arrangement for electrical measurement ascertains "subordinate" quantities, and is also "main" quantities with great accuracy and safety against falsification. An active energy to be measured is a main quantity, and a subordinate quantity is at least one of the following quantities: effective value of the voltage (u?) or of the current (i?), volt hours, volt square hours ampere hours, ampere, square hours, active power reactive power, reactive energy, apparent output, apparent energy or power factor. The arrangement may comprise a voltage sensor (8), a voltage/current-converter (9) a multiplier, (10), a current/voltage-converter (11) two …
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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 14, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 14, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 14, 2012.
- 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
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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.