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:
Jan. 11, 2011
Filed:
Apr. 30, 2007
Lisa Cousins, Woodbridge, CA;
Gholamreza Javahery, Kettleby, CA;
Ilia Tomski, Concord, CA;
Ionics Mass Spectrometry Group Inc., Bolton, CA;
Abstract
An ion guide includes a plurality of rods, arranged about an axis that extends lengthwise from one end to the other of the guide. The rods guide ions in a guide region along and about the axis. A conductive casing surrounds the rods. The casing and the rods are geometrically arranged to produce an axial electric field along the axis. Specifically, the geometry is such that a first constant applied DC voltage (U), applied to the rods, and a second constant applied DC voltage (U) applied to the casing, produce a voltage gradient between said casing and said axis that has a different magnitude at different positions along said axis.