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:
Jul. 26, 1988
Filed:
Jan. 21, 1986
Applicant:
Inventors:
Sadao Deyama, Matsudo, JP;
Toshiya Yamamoto, Matsudo, JP;
Koichi Sakai, Tokyo, JP;
Shigemi Hirasawa, Chiba, JP;
Tadao Kubo, Mobara, JP;
Yoshifumi Tomita, Mobara, JP;
Assignees:
Hitachi Powdered Metals Co., Ltd., both of, JP;
Hitachi, Ltd., both of, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ;
U.S. Cl.
CPC ...
313479 ; 3134 / ;
Abstract
A cathode-ray tube is coated on the inner surface with a coating material which contains, in a weight ratio based on solid, 10 to 22% of graphite, 30 to 50% of a metal oxide, 2 to 9% of a surface treating agent and 25 to 42% of water glass, and in which at least 18% of graphite powders in its simplest form suspended in said coating material have a particle size of at least 1 micron.