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:
Sep. 14, 1982
Filed:
Apr. 25, 1980
Applicant:
Inventors:
Hisashi Ando, Hitachi, JP;
Ko Soeno, Hitachi, JP;
Hiroshi Sakamoto, Hitachi, JP;
Akira Misumi, Mobara, JP;
Hiroshi Fukushima, Chiba, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ; H01K / ;
U.S. Cl.
CPC ...
3133 / ; 252513 ; 252515 ; 313345 ; 29 2517 ;
Abstract
A directly heated cathode for electron tube having a stable electron emission characteristic is provided. The cathode comprises a base metal of Ni-W alloy consisting essentially of 20-30% by weight of tungsten, the balance being nickel and incidental impurities, said alloy being free from a reducing agent, and a layer of thermoelectron emission oxides laid directly and baked onto the flat part at the front side of the base metal. The layer of thermoelectron emission oxides is in direct contact with the flat part of the base metal.