Lowe, Price, LeBlanc, Becker & Shur
Cathode for electron tube
 An oxide-coated cathode for an electron tube comprises a layer (2) of an electron-emissive substance. This layer (2) contains: an alkaline earth metal oxide as a principal component containing at least Ba; an oxide of Sc; and at least one heat-resisting oxide selected from the group consisting of oxides of Al, Si, Ta, V, Cr, Fe, Zr, Nb, Hf, Ta, Mo and W. 
Mitsubishi Denki Kabushiki Kaisha
H
H01J
inventional
Keiji Keiji Ryo Masako Masato
Watanabe Fukuyama Suzuki Ishida Saito