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:
Feb. 12, 1985
Filed:
May. 20, 1981
Gary K Loda, Danville, CA (US);
RPC Industries, Hayward, CA (US);
Abstract
An improved broad beam electron gun having a hot cathode assembly which is comprised of cathode means for generating a substantially hemispherical space-charge distribution, the cathode means including electron emitting structures having principal electron emissive surfaces which lie in hypothetical cylindrical-shaped surfaces, the axes of revolution of which are coincident with the major axis of symmetry of the electron emitting structure, the major axis of symmetry being orthogonal to the plane of the anode, the electron emitting structures variously including concave filament sections which form a tip, cylinders and coils, and wherein an electron beam of broad, uniform cross-sectional area is obtained without a shaping grid.