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:
Mar. 20, 1990
Filed:
Jul. 20, 1988
George Wakalopulos, Danville, CA (US);
American International Technologies, Inc., Torrance, CA (US);
Abstract
A wide area electron gun in which an electron beam originates from secondary emission electrons emitted by a target bombarded by ions. A cylindrical main housing has a central region where the secondary emission target is located and auxiliary housings on opposed sides of the target, outside of the main housing, contain low temperature ion plasmas. Ion beams are extracted from peripheral regions of the plasmas and enter narrow ports or slits connecting the auxiliary housings with the main housing. A higher pressure in the auxiliary housings, compared to the main housing, supports ion flow into the main housing. The ion beams have a low angle of incidence to the plane of the target and may be either slightly below or above the target. In the case the beam enters from above the target, the target is segmented, like venetian blinds. The secondary electrons exit the main housing through a foil window such that the electron beam is almost at right angles to the ion beams.