Capacitive pressure sensor and method of manufacturing same
CA 2028835 C · Owner: Klahn, Thomas · Inventors: Hegner, Frank; Klahn, Thomas; Dittrich, Gerhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The capacitive pressure sensor (10) has two disks (11 12), of alumina which are joined together around the periphery in a defined spaced relationship and parallel to each other, forming a chamber (14). At least one of the two disks (11) is designed as an elastic diaphragm. A pure nickel coating (16, 18) is applied to the surface of each disk by electroless deposition from an aqueous solution and on the surfaces of the two disks facing each other capacitor electrodes (17, 20, 21) are formed by patterning the nickel coating. The capacitor electrodes are connected to an electronic circuit disposed outside the chamber (14) by additional nickel coatings which are formed in plated-through holes …
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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 March 24, 1990 and granted September 29, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 24, 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.