Capacitance measuring circuit for a capacitive sensor
CA 2255225 A1 · Owner: Pronovost, Jean · Inventors: Pronovost, Jean; Tardif, Bruno
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The circuit and the method are for measuring a capacitance of a capacitive sensor. According to the method a charging circuit charges the, capacitive sensor with a voltage and a discharging circuit discharges the capacitive sensor. A trigger circuit triggers the charging circuit and the discharging circuit in alternation into play as a potential of the capacitive sensor drops and rises to predetermined lower and upper levels respectively. An output circuit provides a signal having a low level during operation of one of the charging and discharging circuit and a high level during operation of theother one of the charging and discharging circuit. The signal has a period defined by a same …
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 December 15, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 15, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 15, 2020.
- 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.