Diagnostic circuit and method for amperometrically determining the current passing through a sensor
CA 2126296 C · Owner: Wiget, Fridolin · Inventors: Wiget, Fridolin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a diagnostic circuit for amperometrically determining the current passing through a sensor (41). The circuit comprises a current source (v+ 46) for passing a constant DC current through said sensor (41) switching means (45) for selectively operating said current source comparing means (42) for comparing the potential difference (V ss) across said sensor to a reference voltage (V ref) and producing a control signal (D) control means (44) for controlling said switching means (45) in response to said control signal (D) and timing means (48,49) for measuring the cumulative time during which said svaitching signal (Q) has said first logic level during a selected time …
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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 June 20, 1994 and granted December 18, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 20, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 20, 2016.
- 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.