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:
Oct. 17, 2000
Filed:
Oct. 13, 1998
Applicant:
Inventors:
Yoshinori Terui, Shibukawa, JP;
Katsuyoshi Tsunoda, Shibukawa, JP;
Assignee:
Denki Kagaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
3133 / ; 313336 ; 3133 / ;
Abstract
A thermal field emission cathode comprising a tungsten single crystal having an axis direction of <100> and a coating layer of zirconium and oxygen formed thereon, wherein a source for supplying zirconium and oxygen contains an element capable of forming cubic or tetragonal zirconium oxide at an operation temperature of the thermal field emission cathode.