Title:
METHOD OF MANUFACTURING TUNGSTEN FOR TUBE LAMP
Document Type and Number:
Japanese Patent JPS5353177
Kind Code:
A
Abstract:
PURPOSE: To obtain tungsten powder of a predetermined grain size and uniformly containing doping agent by making X-ray intensity ratio of tungsten oxide produced by primary reduction to be 0.2 to 1.5 and then causing secondary reducing reaction.
Inventors:
KOSEKI ISAMU
YOSHIZAKI SHIICHIROU
YAMAZAKI OSAMU
YOSHIZAKI SHIICHIROU
YAMAZAKI OSAMU
Application Number:
JP12734076A
Publication Date:
May 15, 1978
Filing Date:
October 25, 1976
Export Citation:
Assignee:
TOKYO SHIBAURA ELECTRIC CO
International Classes:
H01K3/02; (IPC1-7): H01K3/02