Surface impedance measurement device
CA 2018689 C · Owner: Labaune, Gerard · Inventors: Gobin, Vincent; Issac, Francois; Labaune, Gerard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A surface impedance measurement device comprises a transmitting electrode producing a magnetic field in the area surrounding a material to be tested and a receiving electrode receiving the magnetic field. An electric voltage wobbled in frequency is applied to the transmitting electrode and a circuit measures, the voltage at the terminals of the second electrode. For the electrodes to be applied on the same side of the material to be tested and of which the surface impedance is to be measured, the electrodes are superposed by the intermediary of a dielectric wedge in a compact probe. The impedance measurements are then independent of the dimensions and geometry of the material.
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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 11, 1990 and granted September 20, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 11, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 11, 2012.
- 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.