Differential charge amplifier for a piezoelectric sensor
CA 2187486 C · Owner: Societe Nationale D'Etude Et De Construction De Moteurs D'Aviation "Snecma" · Inventors: Vanoli, Joel Marc
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In accordance with the invention, the differential charge amplifier includes the means to subtract allowing the difference between two measurement currents delivered by a differential sensor (10) to be calculated and the means to integrate which comprises only a single integration capacitor to integrate the signal delivered by the means to subtract. According to a first operation mode the subtraction means include a negative immittance impedance converter (21) and the integration means (25) are comprised of an operational amplifier mounted as an integrator. According to a second operation mode the subtraction and integration means are comprised of a differential current amplifier charged by …
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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 October 9, 1996 and granted May 20, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 9, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 9, 2018.
- 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.