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:
Nov. 09, 1999
Filed:
Nov. 07, 1996
Gyu-Nam Ju, Seoul, KR;
Jong-Seo Choi, Anyang, KR;
Keun-Bae Kim, Seoul, KR;
Kwang-Min Lee, Suwon, KR;
Kwi-Seok Choi, Seoul, KR;
Su-Chan Lee, Suwon, KR;
Sang-Jin Lee, Suwon, KR;
SAMSUNG Display Devices Co., Ltd., Kyungki-do, KR;
Abstract
A cathode for an electron tube includes a layer of a electron emitting substance containing alkaline earth metal oxides containing 0.01--20.0 wt % of both a lanthanum compound and a magnesium compound or a lanthanum-magnesium compound disposed on a base metal including nickel as a major component and tungsten as a minor component. The tungsten prevents embrittlement and ensures a continuing supply of fill barium in the electron-emitting substance. The cathode enjoys full interchangeability with the conventional oxide cathode and a 15-30% longer life span.