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. 26, 1988
Filed:
Aug. 11, 1986
Applicant:
Inventor:
Albert V Crewe, Palos Park, IL (US);
Assignee:
Electron Beam Memories, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
2504 / ; 2504 / ; 313310 ; 313336 ;
Abstract
An axially compact field emission cathode assembly for use in an electron beam device comprises a field emission tip, an electriclly conductive filament for mechanically supporting said tip and for receiving and conducting to said tip a predetermined electrical potential for exciting said filament to cause electron emission from said tip. Filament support means supports the filament with the tip positioned on an electron beam axis within said device. The cathode assembly is characterized by the filament being supported by said filament support means to extend transversely to the electron beam axis, whereby to reduce the axial length of the device.