Pressure sensor membrane having stepped annular peripheral surfaces and sensor employing same
CA 2224141 C · Owner: Heller, Heinz · Inventors: Schwagerl, Robert; Neubeck, Kurt; Heller, Heinz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a membrane for a pressure sensor. The membrane has on a flat central face, an annular attachment face which is disposed concentric to the central face and a non-flat connecting face, which links the central face with the edge face. The connecting face is formed from at least one annular step which consists of one flat annular face and one truncated-cone-shaped step face which connects radially inward to the annular face. The annular faces and the central face lie in planes parallel to each other whereby the heights of the step faces measured perpendicular to the plane of the central face are very small in relationship to the width of the respective step. This stepped …
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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 December 9, 1997 and granted April 23, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 9, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 9, 2019.
- 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.