Abstract: A panel glass of a color cathode ray tube exhibiting a high absorption of X-radiation and an excellent resistance to electron and/or X-ray browning, which is modified by 0.1-5.0 wt % Nd.sub.2 0.sub.3 to provide substantially higher relative light transmission in the green and in the red wavelengths of the visible spectrum and a greater selective light absorption in the yellow region of the spectrum, and which is further modified by 0.0005-0.05 wt % Cr.sub.2 O.sub.3 and 0-2 wt % Pr.sub.6 O.sub.11 to control the chromaticity value of the glass to be nearly equal to that of the light emitted from tricolor phosphor P22 and to suppress the dichroism of the glass for different ambient lights. Ingredients of the glass are as follows: 50-75% SiO.sub.2, 0-5% Al.sub.2 O.sub.3, 0-4% CaO, 0-3% MgO, 0-13% SrO, 0-16% BaO, 0-3% PbO, O-3% ZnO, 0-4% ZrO.sub.2, the sum of SrO+BaO+PbO+ZnO+ZrO.sub.2 being 5-25%, 0-4% Li.sub.2 O, 3-15% Na.sub.2 O, 2-15% K.sub.2 O, the sum of Na.sub.2 O+K.sub.2 O being 5-20%, O-2%, TiO.sub.

Abstract: The instant invention is directed to the production of highly crystalline glass-ceramic articles demonstrating high intrinsic mechanical strength and toughness containing crystals of canasite and/or agrellite and/or fedorite as the predominant crystal phase. The articles have overall compositions consisting essentially, expressed in terms of weight percent on the oxide basis, of about______________________________________ SiO.sub.2 45-75 CaO 8-30 F 3.5-12 Na.sub.2 O 3-15 K.sub.2 O 0-20 Na.sub.2 O + K.sub.2 O 5-25 B.sub.2 O.sub.3 0-6 Al.sub.2 O.sub.3 0-7 ZrO.sub.

Abstract: In a plurality of monochromatic colored light emitted cathode ray tubes arranged in a surface to form a huge screen for displaying a colored picture, glass for use in light-source cathode ray tubes for emitting the red or the blue light has the optical characteristics that it can well pass the light in the wavelength range of the remaining blue and yellow portions of the spectrum to thereby improve contrast of the monochromatic colored red or green light source cathode ray tube. The glass essentially consists, by weight, of 50-75% SiO.sub.2, O-5% Al.sub.2 O.sub.3, 0-4% CaO, 0-2% MgO, 0-12% SrO, 0-16% BaO, 0-3% PbO, 0-3% ZnO, 0-3% ZrO.sub.2, the sum of SrO+BaO+PbO+ZnO+ZrO.sub.2 being 1.5-25%, 0-4% Li.sub.2 O, 3-15% Na.sub.2 O, 1-10% K.sub.2 O, the sum of Li.sub.2 O+Na.sub.2 O+K.sub.2 O being 5-24%, 0-2% TiO.sub.2, 0.1-3% CeO.sub.2, 1-10% Nd.sub.2 O.sub.3, 0.5-5% Pr.sub.2 O.sub.3, and 0.1-4% Fe.sub.2 O.sub.3.

Abstract: A fluorine-free glass composition is disclosed especially adapted for forming the faceplate of a cathode ray tube such as a television tube. The glass is silica based and includes a fluorine-free flux and an X-ray absorber which may comprise lead oxide, barium oxide, strontium oxide, and mixtures thereof. Optionally, the glass may contain still other oxides to impart desired physical properties. The absence of fluorine avoids the usual problems of that ingredient in melting and processing the glass. In addition, the resultant glass as a faceplate provides improved protection to a viewer of a cathode ray tube by excellent absorption of X-rays.

Abstract: The instant invention is directed to the production of photochromic glasses having compositions consisting essentially, as analyzed in weight percent on the oxide basis, ofSiO.sub.2 --55-60Al.sub.2 O.sub.3 --9-10B.sub.2 O.sub.3 --19-20.5Li.sub.2 O--2-2.5Na.sub.2 O--2-3K.sub.2 O--6-7PbO--0.1-0.25Ag--0.1-0.15Cl--0.3-0.5Br--0.05-0.15CuO--0.0065-0.01The glasses are capable of being drawn into sheet and articles cut from the sheet simultaneously shaped and photochromic properties developed therein. The glasses display a clear luminous transmittance in excess of 90% when free from tint, a darkened luminous transmittance at 20.degree. C. below 25% when free from tint, and a fading rate at 20.degree. C. such that the glass demonstrates a faded luminous transmittance at least twice that of the darkened transmittance after a five-minute fading interval.

Abstract: Acid and alkali oxides are smelted for an extended period of time at a first elevated temperature above their melting temperatures. The smelted mixture is then quenched in water and fritted. The fritted mixture is then disposed between a pair of members which are to be hermetically sealed relative to each other. The fritted mixture is then at least partially fused in an oxygen atmosphere at a second temperature below the first temperature for a relatively short period of time. The at least partially fused mixture is then rapidly cooled in air. In this way, the mixture is provided with a partially amorphous state and a partially crystalline state. The crystals in the mixture are disposed primarily at the borders of at least a particular one of the members to be sealed.The mixture hermetically seals the two members, is resistant to acids and alkalis and inhibits the propagation of cracks.

Abstract: Foamable glass composition suitable for making glass foam, which starts from water glass material and consisting essentially of 100 parts by weight of anhydrous modified sodium silicate and 0.5-4 parts by weight of CaCO.sub.3 as a foaming agent. A foam in the closed-cell form, which is light is in weight, and excellent water resistance, strength and heat resistance, is obtained, wherein CO.sub.2 in a gas existing in the cell is 50% by volume or more.

Abstract: Alkali-resistant glass fibres for use as reinforcement in cementitious products are formed from a composition comprising, in weight percentages:______________________________________ SiO.sub.2 55 to 75% R.sub.2 O 11 to 23% ZrO.sub.2 6 to 22% Cr.sub.2 O.sub.3 0.1 to 1% Al.sub.2 O.sub.3 0.1 to 7% Rare earth oxides + TiO.sub.2 0.5 to 16% ______________________________________where R.sub.2 O is any one or more of Na.sub.2 O, K.sub.2 O or Li.sub.2 O, the content of TiO.sub.2 does not exceed 10%, and the total of the components recited above amounts to at least 88% by weight of the glass, the glass having been melted under non-oxidizing conditions such that all or a substantial proportion of the chromium in the glass is in the trivalent state.Cementitious products incorporating such fibres, e.g. in a proportion of 3 to 6 weight %, can be made using a Magnani-type asbestos cement machine or by a "spray-up" method.

Abstract: Glass compositions which are suitable for making face-plates of cathode-ray tubes used for displaying television pictures, particularly for displaying color television pictures. A problem in formulating such glasses is to obtain glasses which can be worked satisfactorily and which do not discolor significantly as a result of electron bombardment and X-ray irradiation. The glass compositions consist of the following constituents in the following quantities (expressed in % by weight):______________________________________ SiO.sub.2 57-65 ZrO.sub.2 1-4 Al.sub.2 O.sub.3 0-4 SrO 6-14 Na.sub.2 O 5.5-8.0 PbO 0-1 K.sub.2 O 7.5-10.0 Sb.sub.2 O.sub.3 + As.sub.2 O.sub.3 0-2 MgO 0-4 TiO.sub.2 0.2-2.0 CaO 0-4 CeO.sub.2 0.05-1.0 ______________________________________wherein wt. % Na.sub.2 O/(wt. % Na.sub.2 O+wt. % K.sub.2 O)=0.40-0.47 and wt. % BaO+2 wt. % SrO+2 wt. % ZrO.sub.2 +3 wt. % PbO>32.

Abstract: This invention relates to a process for preparing transparent iron oxide pigment dispersions. The dispersions are prepared by milling a mixture of iron oxide pigment and a liquid vehicle in a bead mill containing glass beads as the grinding media. The pigment dispersions can be used in the preparation of paints and coatings which exhibit transparent quality and absorb ultraviolet radiation.

Abstract: This invention is directed to the production of glazes exhibiting an earthenware appearance which are particularly suitable for decorating ceramic dinnerware. The glaze composition consists essentially of about 4-8% by weight SnO.sub.2 and 4-8% by weight TiO.sub.2, the total SnO.sub.2 +TiO.sub.2 being about 10-14%, and about 0.025-0.04% by weight MnO.sub.2 incorporated into a base frit consisting essentially, as analyzed in weight percent on the oxide basis, of about______________________________________ SiO.sub.2 37-49 Al.sub.2 O.sub.3 4-7 B.sub.2 O.sub.3 6.5-11 ZrO.sub.2 0-1.75 Na.sub.2 O 1.75-3.5 K.sub.2 O 0.75-2.5 PbO 21-32 CdO 0-0.75 CaO 1-9 TiO.sub.2 0-0.35 F 0-0.6 ______________________________________The fired glaze contains crystallites of rutile and cassiterite.

Abstract: The instant invention is directed to faceplate glasses for television picture tubes which, because they are essentially free from MgO, have liquidus temperatures below 800.degree. C. Such glasses consist essentially, in weight percent on the oxide basis, of:______________________________________ SiO.sub.2 58-65 Al.sub.2 O.sub.3 1-3 CaO 1-4 SrO 6-12 BaO 2-9 PbO 1-3 Na.sub.2 O 5-9 K.sub.2 O 5-12 Na.sub.2 O + K.sub.2 O 14-18 TiO.sub.2 0.3-1 CeO.sub.2 0.05-0.

Abstract: Disclosed is a non-linear resistor of a sintered ZnO ceramics, which has a glass coating having a baking temperature higher than 850.degree. C. but a temperature lower than the sintering temperature of the sintered ZnO ceramics, and has a composition:(a) 30 to 75% by weight of SiO.sub.2,(b) 0.3 to 15% by weight of at least B.sub.2 O.sub.3 and PbO,(c) 2 to 30% by weight of Al.sub.2 O.sub.3,(d) less than 30% by weight of an alkaline earth metal oxide,(e) less than 40% by weight of ZnO,(f) less than 25% by weight of TiO.sub.2, and(g) less than 5% by weight of an alkali metal oxide.The glass coating baked at a range of 850.degree. C. to 1300.degree. C. provides non-linear resistors having a large non-linear coefficient and a high impulse current resistance as well as a good resistance to an acid and water.

Abstract: The instant invention is concerned with a method for producing shades of a tint in a photochromic glass, the hue of which will be essentially permanent even after subjecting the glass to temperatures up to about the strain point of the glass. Silver halide crystals constitute the photochromic agents, the glass contains lead, and the method contemplates exposing such a glass to a gaseous reducing atmosphere at temperatures above the strain point of the glass to cause the reduction of silver ions to metallic silver and the reduction of lead ions to metallic lead which coats or alloys with the metallic silver.