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:
Sep. 16, 2014
Filed:
May. 19, 2011
James B. Mcginn, Portland, OR (US);
James B. McGinn, Portland, OR (US);
FEI Company, Hillsboro, OR (US);
Abstract
An ExB Wien mass filter providing a method and structure for mechanically adjusting the magnetic field distributions at the mass filter entrance and exit end caps. The reluctance of the flux return path may be modified by configuring pluralities of magnetic shims within slots at the outer diameters of the entrance and exit end caps, and also by configuring pluralities of magnetic plug shims within circular flux dams surrounding the entrance and exit apertures. Advantages of purely mechanical adjustment for the magnetic fields of the present invention, compared with prior art electromagnet adjustment methods include greater reliability, simplicity, lower cost, and lack of power dissipation. The invention may employ either permanent magnets or electromagnets for generation of the mass-separation magnetic field.