Mass spectrometer and method with improved ion transmission
CA 1307859 C · Owner: Douglas, Donald James · Inventors: French, John Barry; Douglas, Donald James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a mass spectrometer system, ions travel through an orifice in an inlet plate into a first vacuum chamber containing AC-only rods, and then through an orifice into a second vacuum chamber containing a standard quadrupole. The second vacuum chamber is held at low pressure, e.g. .02 millitorr or less but the product, of the pressure in the first chamber times the length of the AC-only rods is held above 2.25 X 10-2 torr cm pre-, ferably between 6 X 10-2 and 15 X 10-2 torr cm and the, DC voltage between the inlet plate and the AC-only rods is kept low, e.g. between 1 and 30 volts preferably, between 5 and 10 volts. This produces a large enhancement in ion signal, with less focussing …
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
- Granted September 22, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 22, 2009.
- 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.