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. 02, 1982
Filed:
Nov. 06, 1979
Kazuo Sunahara, Mobara, JP;
Akira Misumi, Mobara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An oxide-coated cathode for electron tubes comprising a base metal plate made of an alloy containing nickel as a major component and at least one high-melting point metal in an amount of 2% by weight or more, and if required, a small amount of one or more reducing elements, and an electron emissive alkaline earth metal oxide layer adhered to the base metal plate, characterized by having a carbide layer made of at least one carbide of Si, B, Ti, Zr, Hf, V, Nb, Ta, Mo or W between the base metal plate and the electron emissive alkaline earth metal oxide layer can maintain electron emitting life for a long period of time due to the prevention of interfacial reaction between the base metal layer and the alkaline earth metal oxide layer.