Fragmentation of ions by resonant excitation in a high order multipole field, low pressure ion trap
CA 2481081 C · Owner: Stott, Wiliam R. · Inventors: Stott, Wiliam R.; Londry, Frank; Collings, Bruce A.
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In the field of mass spectrometry, a method and apparatus for fragmenting ions with a relatively high degree of resolution and efficiency. The technique includes trapping the ions in a linear ion trap in which the background or , neutral gas pressure is preferably on the order of 10-5 Torr. The trapped ions are resonantly excited for a relatively extended period of time e.g. exceeding 50 ms, at relatively low excitation levels e.g. less than 1 Volt , (0-pk). The technique allows selective dissociation of ions with a high discrimination. High fragmentation efficiency may be achieved by superimposing a higher order multipole field onto the quadrupolar RF field used to trap the ions. The …
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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.
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- Filed April 2, 2003 and granted January 10, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 2, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 2, 2025.
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