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:
May. 21, 1991
Filed:
Aug. 31, 1989
Norio Koike, Hyougo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A color cathode ray tube having a vacuum envelope including a panel with an inner surface, a neck and a funnel connecting the neck to the panel, a phosphor screen provided on the inner surface of the panel for emitting visible light, an electron gun provided in the neck for emitting a plurality of electron beams towards the phosphor screen, a shadow mask provided adjacent to the phosphor screen with a predetermined distance from the phosphor screen, and a porous layer, which is formed on a surface of the shadow mask facing to the electron gun. The porous layer is formed by using metal alkoxide solution which contains black color pigment containing both of cobalt oxide and nickel oxide.