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. 13, 1982
Filed:
Apr. 20, 1980
Applicant:
Inventors:
John E Wolfe, Julian, CA (US);
Lynwood W Swanson, McMinnville, OR (US);
Assignee:
Burroughs Corporation, Detroit, MI (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ;
U.S. Cl.
CPC ...
313336 ; 29 2517 ; 3133 / ; 427 77 ; 252515 ;
Abstract
Disclosed is an electron-beam cathode which emits electrons with a low work function over a relatively wide range of temperature and pressure. The cathode is comprised of single crystal tungsten having zirconium and oxygen dopant atoms within the bulk thereof. This cathode is formed by the steps of attaching zirconium to a portion of the surface of single crystal tungsten, and heating the tungsten with the zirconium attached thereto in an atmosphere of oxygen to diffuse the zirconium and the oxygen into the bulk of the tungsten.