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:
Mar. 22, 1988
Filed:
Aug. 07, 1986
Kiyoshi Tokita, Fukaya, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A color picture tube has: an envelope; a phosphor screen formed on the inner surface of the envelope; a shadow mask which is disposed in the envelope and in a vicinity of the phosphor screen and which has a main surface portion with a number of apertures; and an electron gun for emitting electron beams which are selectively transmitted through the apertures and are bombarded on the phosphor screen so as to emit multi-color light. A layer having a ceramic material as a major constituent is chemically bonded to that surface of the main surface portion of the shadow mask which is located at the side of the electron gun, and a conductive layer is formed on the layer. The charge-up phenomenon of the layer having a ceramic material is prevented by the conductive layer.