Use of an off-axis ion path for background reduction of an rf-only quadrupole mass analyzer
CA 2206557 A1 · Owner: Sciex, A Division Of Mds Inc. · Inventors: Hager, James W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mass spectrometer apparatus is adapted to separate desired from unwanted ions. It has the elements of the apparatus divided into first and second groups of elements, each of which groups include at least one element, wherein the first group of elements is located on a first upstream axis and the second group of elements is located on a second downstream axis, which first and second axes are inclined at an angle to one another the, angle being such that at least a portion of the desired ions travel from the first axis to the second axis, and that the unwanted ions substantially fail to traverse from the first axis to the second axis. The first group can include the ion source, the inlet …
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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 May 30, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 30, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 30, 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
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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.