Gas analyzer
CA 2116706 A1 · Owner: Queen'S University At Kingston · Inventors: Hunt, Stephen; Layzell, David B.; Dowling, Adrian N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for measuring the concentration of minor gaseous components of a flowing gas stream is described. The apparatus which is preferably computer controlled includes gas mixing means and means to measure the concentration of at least two gases including the minor component, in the gas stream. In order to calibrate the apparatus an auxiliary unit, which may include a gas generator meters delivery of the minor, component from a second source into the gas stream. The apparatus has many industrial and scientific applications and is particularly useful for measuring hydrogen concentrations from which a measure of nitrogenase activity in nitrogen fixing plants can be obtained.
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 March 1, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 1, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 1, 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.