Process and device for detecting oxidable and/or reducible gasses in air
CA 2256010 A1 · Owner: Rump, Hanns · Inventors: Rump, Hanns
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process and device for detecting oxidable and/or reducible gasses in air are useful for controlling ventilating systems in buildings or vehicles and for monitoring combustion processes and/or waste gas catalytic converters. At least one energised and heated sensor (5.1,; 7.2) provided with contact electrodes (5.9; 5.10) and with a metallic sensor material preferably , polycrystalline metal oxide is used, as well as an electric evaluation circuit. The sensor (5.1; 7.2) is crossed by an alternating current which either consists of at least two alternating currents of different frequencies or is switched between at least two frequencies. Capacity changes between the sensor material …
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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 April 29, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 29, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 29, 2019.
- 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.