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. 10, 1979
Filed:
May. 02, 1977
Applicant:
Inventors:
Robert L Seliger, Agoura, CA (US);
James W Ward, Canoga Park, CA (US);
Assignee:
Hughes Aircraft Company, Culver City, CA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
2503 / ; 2504 / ; 3151113 ;
Abstract
A high current ion beam is extracted from an ion plasma by a low perveance ion optical system including a screen electrode, a final electrode and an intermediate electrode therebetween which is shaped to correspond to the extraction voltage equipotentials therebetween. By controlling the voltage of the intermediate electrode with respect to the other two electrodes focusing is accomplished.