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. 30, 2002
Filed:
Aug. 30, 1999
Applicant:
Inventor:
Chen Yan, Yorktown, VA (US);
Assignee:
Southeastern Universities Research Association, Inc., Newport News, VA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 3/7141 ;
U.S. Cl.
CPC ...
H01J 3/7141 ;
Abstract
A conventional particle generation and magnet configuration are used in combination with a relatively low-power power amplifier, a resonant loop magnet driver system, an amplitude modulator that induces a homogeneous amplitude function proportional to (t) and, when individual X and Y magnets are used, a precision phase shifter that induces a 90° phase shift in the applied power to one of the magnets to produce a circular raster pattern of virtually uniform density.