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:
Jan. 09, 1990
Filed:
Jan. 14, 1987
Applicant:
Inventors:
Hideo Tanabe, Mobara, JP;
Mamoru Tsuzurahara, Mobara, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ;
U.S. Cl.
CPC ...
3133 / ; 313292 ; 313332 ; 445 50 ;
Abstract
A cathode structure comprises a substrate including a porous sinter of a metal having a high melting point, which is impregnated with electron emitting material, a metal cup for receiving the substrate, a layer of solder disposed between the substrate and the metal cup, a covering layer disposed between the substrate and the solder layer and made of a metal having a melting point higher than that of the solder, a metal sleeve for supporting the metal cup, and a heater.