Device to determine and/or monitor a predetermined filling level in a container
CA 2087343 C · Owner: Pfandler, Martin · Inventors: Pfandler, Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The device has at least two vibration rods secured at a distance apart to a diaphragm the edge of which is connected to a, screw-in member. A clamping screw is secured to the diaphragm on the side away from the clamping rods tightly enough for the clamping screw and the diaphragm to adopt a position in which the axes of symmetry coincide. The clamping screw is surrounded by a stack of annular piezoelectric elements electrodes and insulating rings, The stack forms the excitation and reception converter of the device. The stacked excitation and reception converter is clamped and secured between the diaphragm and a hexagon nut. The stack is supported by means of the terminating metal ring on a …
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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 June 5, 1992 and granted February 25, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 5, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 5, 2014.
- 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.