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. 13, 2004
Filed:
Apr. 02, 2002
Tihiro Ohkawa, La Jolla, CA (US);
Archimedes Technology Group, Inc., San Diego, CA (US);
Abstract
A device and method for selectively establishing predetermined orbits, relative to an axis, for ions of a first mass/charge ratio (m ), requires crossing an electric field with a substantially uniform magnetic field (E×B). The magnetic field is oriented along the axis and the electric field has both a d.c. voltage component (∇&PHgr; ) and an a.c. voltage component (∇&PHgr; ). In operation, voltage &PHgr; is fixed to place the ions m on confined orbits around the axis when &PHgr; is zero. On the other hand, when &PHgr; is tuned to a predetermined value, the ions m are ejected away from the axis. With E×B established in a chamber, the ions m will pass through the chamber when on confined orbits (&PHgr; =0), and they will be ejected into the wall of the chamber when on unconfined orbits (&PHgr; =predetermined value).