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:
Jun. 11, 2002
Filed:
Jun. 13, 2000
Applicant:
Inventor:
Allan Sanderson, Cambridgeshire, GB;
Assignee:
The Welding Institute, Cambridge, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 1/02 ;
U.S. Cl.
CPC ...
H01J 1/02 ;
Abstract
A charged particle emitting assembly comprises an emitter member ( ) for emitting charged particles of one polarity. A tubular shield electrode ( ) circumferentially surrounds the emitter member and is held in use at the same polarity as the charged particles. A tubular accelerating electrode ( ) is positioned substantially coaxially with the shield electrode ( ) and is held in use at the opposite polarity to the shield electrode. The arrangement is such that charged particles from the emitter member ( ) initially spread laterally outwardly and then are focused into a beam which passes through the tubular accelerating electrode ( ).