The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 03, 2012
Filed:
Nov. 07, 2007
Alexander Makarov, Bremen, DE;
Reinhold Pesch, Weyhe, DE;
Robert Malek, Lilienthal, DE;
Viacheslav Kozlovskiy, Chernogolovka, RU;
Alexander Makarov, Bremen, DE;
Reinhold Pesch, Weyhe, DE;
Robert Malek, Lilienthal, DE;
Viacheslav Kozlovskiy, Chernogolovka, RU;
Thermo Fisher Scientific (Bremen) GmbH, Bremen, DE;
Abstract
A method of transporting gas and entrained ions between higher and lower pressure regions of a mass spectrometer comprises providing an ion transfer conduitbetween the higher and lower pressure regions. The ion transfer conduitincludes an electrode assemblywhich defines an ion transfer channel. The electrode assemblyhas a first set of ring electrodesof a first width D, and a second set of ring electrodes of a second width D(≧D) and interleaved with the first ring electrodes. A DC voltage of magnitude Vand a first polarity is supplied to the first ring electrodesand a DC voltage of magnitude Vwhich may be less than or equal to the magnitude of Vbut with an opposed polarity is applied to the second ring electrodes. The pressure of the ion transfer conduitis controlled so as to maintain viscous flow of gas and ions within the ion transfer channel.