Relative pressure sensor
CA 2277746 C · Owner: Schmidt, Elke · Inventors: Schmidt, Elke; Drewes, Ulfert; Rossberg, Andreas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In this flush-diaphragm relative pressure sensor (1) the reference air reaches its current dew point before getting into the interior of the housing. The sensor has a capacitive resistive, or piezoelectric sensing element (2) with a diaphragm (21) an external surface of which comes into direct contact with a medium under pressure. A housing (7) has an interior space (71) and a front portion (72) open across the interior space in the vicinity of which the diaphragm closes the interior space such that the front portion projects beyond the diaphragm. Further the housing has a bore (721) extending through the front portion from an outer side thereof to the interior space for guiding 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 July 20, 1999 and granted September 23, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 20, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 20, 2021.
- 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.