Isothermal flow controller for air sampler
CA 2266061 C · Owner: Hall, Peter M. · Inventors: Hall, Peter M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for measuring gas flow in a gas sampling device including a, vacuum pump which generates pulsations and the gas flow is disclosed. The exhaust from, the vacuum pump is passed through a tube having an internal diameter of about 1 mm to, about 5 mm, and the length of about 10 mm to about 150 mm under substantially isothermal conditions. Pulsations in the gas flow are dampened in the pulsation damper, located at the upstream end of the tube. The pressure is measured at the upstream end of, the tube and the gas flow is derived from a predetermined relationship between the gas, flow and the tub under substantially isothermal conditions and the upstream pressure in, …
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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 6, 1999 and granted October 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 6, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 6, 2021.
- 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.