Process and device for determining the level of a fluid using ultrasonic pulses
CA 2241875 C · Owner: Eisentraudt, Michael · Inventors: Willner, Siegfried; Eisentraudt, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In order to improve the measuring accuracy of a liquid level (H) in a container (2) from an echo time measurement of ultrasonic pulses and a mean sound velocity (.dottedcircle.) it is, provided to extrapolate the mean sound velocity (.dottedcircle.) from at least two reference sound velocities in the liquid (90). It is possible in this way to achieve a measuring accuracy of less than a millimetre independently of the liquid level (H). Specified for carrying out the method is a device (1) having a main measuring path, at least one device for transmitting and receiving ultrasonic pulses, at least two reference paths for determining sound velocities, and having a computer unit (50) the …
Read the whole patent
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 December 17, 1996 and granted September 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 17, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 17, 2018.
- 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.