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:
Dec. 01, 1987
Filed:
Oct. 15, 1985
Applicant:
Inventor:
Michael A Kelly, Portola Valley, CA (US);
Assignee:
Kevex Corporation, Foster City, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
250305 ; 250306 ; 250307 ; 250290 ;
Abstract
Charged particles (ions or electrons) are directed into a drift tube closed off at the upstream and downstream ends by electrical grid members and having an axial magnetic field therein with a substantial radial component. The grids are pulsed to trap the charged particles in the drift tube where the radial magnetic field component mixes their axial and orbital momenta. The potential of the downstream grid is successively lowered for successively extracting particles having a successively lower energy. This analyzer is particularly useful for analyzing surface constitutents.