Extraneous frequency detector
CA 2004136 A1 · Owner: Cox, Roger W. · Inventors: Cox, Roger W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An extraneous frequency detector especially suited for analyzing the three-phase output of a variable speed constant frequency (VSCF) generator generates in a sampleand-hold circuit amplitude samples of a phase selected by a multiplexer for application to a discrete time analog filter in the form of a switched capacitor high pass filter. A control circuit generates dual-phase non-overlapping clocking signals which control the sampling rate of the sample-and-hold circuit and the switching rate of the switched capacitor filter. Two modes of operation are provided for the single filter circuit by generating the clocking signals for the first mode of operation at a first frequency which is at …
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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 29, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 29, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 2011.
- 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.