Lowe, Price, LeBlanc, Becker & Shur
Cathode for electron tube
 This invention is a cathode of an indirect heated type having improved electron emission characteristics. A cathode for an electron tube in accordance with the present invention comprises: a base containing Ni as a major element; and a layer of an electron-emissive substance formed on the base, this layer comprising not only alkaline earth metal oxide as a principal component containing at least Ba, but also rare earth metal oxide of 0.1 to 20 wt. % or rare earth metal of 0.05 to 15 wt. %. 
Mitsubishi Denki Kabushiki Kaisha
H
H01J
inventional
Keiji Masako Masato Toyokazu Kinjiro Keiji
Fukuyama Ishida Saito Kamata Sano Watanabe