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:
Nov. 21, 1995
Filed:
Mar. 05, 1992
Toshihiko Kanayama, Tsukuba, JP;
Agency of Industrial Science and Technology, Tokyo, JP;
Abstract
A method and apparatus for trapping charged particles employs at least one central electrode. An AC voltage and a DC voltage are superimposed and are applied to the central electrode resulting in an AC electric field having an intensity which declines with an increase in the distance from the central electrode, and a DC electric field which attracts charged particles forces toward the central electrodes. Charge particles are trapped in the space outside the central electrode by these fields. A wide trapping range in terms of mass and energy can be achieved with a high trapping density. The central electrode can consist of four element electrodes which are supplied with AC voltages superimposed on a DC bias voltage in such a manner that respective adjacent element electrodes are supplied with opposite phase AC voltages.