Solid state differential pressure sensor with overpressure stop and free edge construction
CA 2001047 A1 · Owner: Naumaan, Ahmed · Inventors: Rud, Stanley E. Jr.; Knecht, Thomas A.; Naumaan, Ahmed
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A solid state pressure sensor utilizes a brittle diaphragm made of a material such as silicon which is, mounted between base plates of glass and which deflects, in response to pressure. The base plates of glass can have recesses formed therein to receive the diaphragm and provide a full support across the diaphragm under overpressure conditions to prevent overstressing the diaphragm, or the diaphragm can have such contoured surfaces for forming overpressure stop surfaces against the facing base plate. The diaphragm has grooves defining a central portion that deflects and whereby, the grooves will form webs joining the central portion to an outer rim so that the diaphragm acts similarly to a …
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 October 19, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 19, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 19, 2011.
- 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.