Ultrasonic apparatus and method for measuring the concentration and flow rate of gas
CA 2776083 C · Owner: Teijin Pharma Limited · Inventors: Fujimoto, Naotoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An ultrasonic apparatus measures the concentration and flow rate of a sample gas by calculating a possible propagation time range on the basis of the gas temperature determining whether or not the phases at which two first trigger signals respectively generated on the basis of forward and backward waveforms of the ultrasonic waves coincide with each other, processing the zero-cross signals so that the phases coincide with each other obtaining reference zero-cross time instant by calculating mean value of the forward and backward zero-cross time instants obtaining an ultrasonic reception point by subtracting an integral multiple of the cycle of the ultrasonic waves so that the results of 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 April 20, 2004 and granted March 24, 2015. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 20, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 20, 2026.
- 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.