Signal processing method and apparatus for flowmeters
CA 2000700 A1 · Owner: Engineering Measurements Company · Inventors: Waers, John F.; Barrett, William D.; Schlatter, Gerald L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a method of measuring the flow of a fluid in a pipeline, wherein the pipeline has noise comprising the, steps of: a) inserting a flow barrier in the pipeline thereby, forming a wake of vortices; b) creating an electronic signal for each vortex by means of a device which also produces electronic signals for the noise; c) transmitting the electronic signals of the vortices and noise to an electronic processor; d) converting the electronic signals of the vortices and noise vibrations from the time domain to the frequency domain; e) removing the electronic noise signals from the electronic vortex signals by means of cross-correlational computations thereby computing the, vortex …
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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 October 13, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 13, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 13, 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.