Graphite-containing conductive suspension for picture tubes

US4917822A · kind A · utility

Assignee

• Nokia Graetz · DE

Inventors

• Norbert Thiel · Annaberg-Buchholz, DE
• Rolf Zondler · Stuttgart, DE

Key dates

• Filing date: May 12, 1988
• Grant date: Apr 17, 1990
• Expiry date: May 12, 2008

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01J29/88
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A conductive suspension for making contact to the inside of a picture tube consists of graphite, glass-frit powder, a binder, such as nitrocellulose, a solvent, such as isoamyl acetate. It can be applied prior to or after the aluminizing process by various techniques, such as brushing, printing, or spraying, and permits the bake-out process and the frit-sealing process to be performed in one step because it is permeable to organic substances. It is easy to remove from defective tube parts by conventional cleansing techniques.