U.S. Philips Corporation

Wilhelmus M Van Kemenade

Johannes M Compen

The invention relates to an electron beam tube for displaying color television pictures and to a method of manufacturing same, in which a graphite suspension substantially free from alkali metal ions and comprising colloidal silicon oxide is used for making contact between the color selection electrode and the phosphor pattern on the display window. This suspension enables a method of manufacture which is simpler than the conventional methods.

Method of manufacturing an electron beam tube and electron beam tube

An electrically conductive layer on a wall portion of the envelope of an electric discharge tube which comprises an electrically conductive material and at least 5% by weight of silicon dioxide as an adhesive, adheres readily, is hard and can be washed with water. Such a layer can be obtained from a suspension comprising an electrically conductive material and a binder in a solvent, in which the binder is a quaternary ammonium silicate or a solution of silicon dioxide (SiO.sub.2) in phosphoric acid (H.sub.3 PO.sub.4), in which the mol ratio SiO.sub.2 /P.sub.2 O.sub.5 is between 0.3:1 and 20:1.

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Eindhoven, Netherlands

Wilhelmus M Van Kemenade