Reagent gas control for an ion trap mass spectrometer used in the chemical ionization mode
CA 2090357 C · Owner: Wells, Gregory J. · Inventors: Wells, Gregory J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A reagent gas flaw control system for use with an ion trap mass spectrometer is shown. The gas reagent gas flows from a source through a first gas flow restrictor connected to the inputs of second and third gas flow restrictors. The output of the second restrictor is connected to the ion trap where reagent gas is used and, the output of the third restrictor is connected to a vacuum pump, which may be the roughing pump used by the ion trap. At least one of the three restrictors is a variable restrictor. The configuration of the present invention allows the use of simple and inexpensive parts to provide exacting flow control.
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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 February 25, 1993 and granted July 10, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 25, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 2015.
- 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
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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.