Abstract: The invention relates to an apparatus (70) and method for removing particles from an interior of a CRT envelope (12). The CRT envelope includes a faceplate panel (14), with a color selection electrode assembly (30) detachably mounted therein, sealed to a funnel (18). The apparatus comprises a plurality of thumper mechanisms (84, 184 and 284) for imparting asynchronous vibrations to the funnel of the envelope while the interior of the funnel is flushed with a suitable fluid. The embodiment further includes a plurality of vibrators (51) for imparting asynchronous vibrations to the color selection electrode assembly to remove particles therefrom, before the color selection electrode assembly is mounted into the panel and sealed to the funnel. A method for removing particles using the apparatus also is described.

Abstract: A noise-reducing foam member for prolonged exposure to ultraviolet radiation without degradation consists essentially of a major proportion of a room-temperature silicone rubber foaming material and minor proportions of a room-temperature foaming curing agent and at least two and preferably three ultraviolet stabilizing materials selected from the group consisting of carbon black, cerium oxide, 2(2'-hydroxy-3',5'-di-tert-amylphenyl) benzotriazole and zinc oxide.The foam member is made by mixing together suitable quantities of the silicone rubber foaming material, the ultraviolet stabilizing materials and the curing agent. The mixture is then cured to provide the foam member.

Abstract: Method comprises positioning a transparent safety panel in close spaced-apart relationship with the viewing window of a CRT and producing a mechanically-strong, hydraulically-tight closure between the panel and window around the margins thereof. The cell formed thereby is filled with curable liquid resin with the window and panel in an essentially vertical orientation. After bubbles have cleared and inspection completed, the liquid resin filling the cell is cured to an optically-clear solid.

Abstract: An optically-black coating that is adherent to metal surfaces, has a low reflectance of light in the range of about 2000 to 7500 Angstroms, and is chemically stable up to at least 750.degree. C., consists essentially of a minor proportion of an inorganic silicate binder and a major proportion of a particulate mixture of cobaltic oxide and zinc oxide in the weight ratio range of 4/1 to 1/1.

Abstract: A method for fabricating a CRT (cathode-ray tube) in which a partially-completed faceplate-panel assembly is baked-out and heat-sealed to a funnel during the same baking cycle. Jets of oxygen-containing gas are directed intermittently into the open neck of the funnel at least during the heating-up period of the heating cycle.

Abstract: Method comprises applying to a surface to be etched a coating of a liquid composition having a pH of about 5.8 to 7.0 and comprising an alkali caseinate, an alkali dichromate photosensitizer, sodium borate and water. The layer is dried, photoexposed, developed and baked to produce an etch-resistant stencil.

Abstract: After an electron tube is exhausted and sealed, a base is pushed into position on the stem of the tube, the space between the stem and the base, at least around one pin of the tube, is filled with a sealing substance, and then the stem is heated until the sealing substance is at least partially cured by heat from the stem to form a dielectric material.