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:
Oct. 09, 2001
Filed:
Aug. 20, 1998
Applicant:
Inventors:
Yoji Yamamoto, Hyogo, JP;
Katsuyuki Yamashita, Kyoto, JP;
Assignee:
Matsushita Electronics Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 1/20 ; H01J 1/914 ;
U.S. Cl.
CPC ...
H01J 1/20 ; H01J 1/914 ;
Abstract
An indirectly heated cathode that can enhance the withstand voltage and the efficiency of radiating heat from a heater to a tubular sleeve, and a cathode ray tube using such a cathode. The indirectly heated cathode comprises a hot cathode emitting electrons at one end, and a tubular sleeve including a high melting point metal and having a heater inside. A thermal absorption layer is formed on the inside face of the tubular sleeve and the thermal absorption layer contains a boron compound.