A gas sensor
CA 2109619 C · Owner: United Kingdom Atomic Energy Authority · Inventors: Williams, David Edward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A gas sensor, for detecting the presence of a gas in a gas mixture comprises , two pairs of electrodes (1 3; 2, 4) mounted on, a sensing element (5) either with the electrodes of each pair spaced apart by a different amount, or with the relationship between the electrodes of one pair and the active surface of the sensing element being different in the case of each set. In use the ratio of, the electrical resistances accross the two pairs of electrodes it measured and the measured values of this ratio are compared with a calibration curve indicating how the ratio varies with concentration of the gas to be detected.
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 May 18, 1992 and granted October 15, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 18, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 18, 2014.
- 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.