Abstract: Thermally induced color is developed in a glass article containing a silver halide crystal phase by including in the glass batch a thermal reducing agent, retaining the thermal reducing agent in its lower valence state while meltinq the batch and forming the glass article and subsequently heat treating the article to partially reduce the silver halide crystal phase.

Abstract: This invention relates to fine glass crystal prepared from lead-free glass compositions. The glasses consist essentially, in weight percent, of______________________________________ SiO.sub.2 54-64 BaO 8-13 Li.sub.2 O 0-3 SrO 8-13 Na.sub.2 O 0-6.5 ZnO 5.5-9 K.sub.2 O 0-7 BaO + SrO + ZnO 22-33 Li.sub.2 O + Na.sub.2 O + K.sub.2 O 8-15 ______________________________________wherein at least two of Li.sub.2 O, Na.sub.2 O, and K.sub.2 O are present and are present in essentially equimolar ratios.

Abstract: This invention is directed to the production of glasses exhibiting an annealing point between 290.degree.-325.degree. C., an index of refraction between 1.57-1.66, a linear coefficient of thermal expansion (25.degree.-300.degree. C.) between 130-160.times.10.sup.-7 /.degree.C., and a weight loss after exposure to boiling water for six hours no greater than 0.1% consisting essentially, expressed in terms of mole percent on the oxide basis, of______________________________________ Li.sub.2 O 0-10 CaO + SrO + 0-20 BaO(RO) Na.sub.2 O 0-10 ZnO 26-50 Li.sub.2 O + Na.sub.2 O 1-20 RO + ZnO 26-50 K.sub.2 O 0-8 SnO 0-5 Li.sub.2 O + Na.sub.2 O + 5-25 Sb.sub.2 O.sub.3 0-8 K.sub.2 O(R.sub.2 O) Ag.sub.2 O 0-13 Al.sub.2 O.sub.3 0.25-5 Tl.sub.2 O 0-12 P.sub.2 O.sub.5 30-36 Ag.sub.2 O + Tl.sub.2 O 1-14 B.sub.2 O.sub.3 0-5 R.sub.2 O + Ag.sub.2 O + Tl.sub.2 O 15-30 CuO 0-5 CaO 0-20 Bi.sub.2 O.sub.3 0-3 BaO 0-10 CeO.sub.

Abstract: This invention is directed to the formation of glass bonded ceramic composite articles, with particular emphasis on forming abrasive products such as grinding wheels. The glasses consist essentially, in weight percent of 15-35% CaO, 35-55% B.sub.2 O.sub.3, and 10-35% SiO.sub.2, with alumina comprising the preferred abrasive particles being bonded into an abrasive product.

Abstract: A transparent glass which, at a thickness of 2 mm, does not transmit more than about 1% of ultraviolet radiation at a wavelength of 380 nm and exhibits a neutral gray, fixed tint bounded by apices A, B, C, D, A of the drawing, a purity no higher than 6, and a luminous transmittance between 10-16, said glass having a composition consisting essentially, expressed in terms of weight percent on the oxide basis, of______________________________________ SiO.sub.2 65-72 CaO 0-1.5 B.sub.2 O.sub.3 2-6 Al.sub.2 O.sub.3 + CaO 0.2-2.25 Na.sub.2 O 6-10 As.sub.2 O.sub.3 0-0.3 K.sub.2 O 10-16 Fe.sub.2 O.sub.3 4.8-6.2 Na.sub.2 O + K.sub.2 O 17-23 Co.sub.3 O.sub.4 0.012-0.02 K.sub.2 O:Na.sub.2 O 1.25-2.25 NiO 0.16-0.21 Al.sub.2 O.sub.3 0-2.25 ZnO 0-1.5.

Abstract: This invention is directed to a glass containing elongated silver halide crystals selected from the group consisting of AgCl, AgBr, AgI, and mixtures thereof which is capable of polarizing radiation in the visible portion of the radiation spectrum and which does not exhibit photochromism when exposed to radiation in the ultraviolet/visible portions of the radiation spectrum, wherein the composition of the glass is essentially free of copper and includes an amount of CeO.sub.2 effective to retain the silver in the glass composition in the oxidized state.

Abstract: There is disclosed a coated article composed of a metal alloy substrate, the metal alloy having a nickel, chromium, cobalt or iron base, and a coating that serves as an oxygen barrier to insulate the metal surface from oxygen attack at temperatures which may range up to 1200.degree. C. The coating comprises a glass-ceramic selected from barium silicate and strontium silicate systems characterized by additives that enable forming a continuous well flowed glass coating prior to setting of the coating by crystallization. These additives include the refractory oxides Al.sub.2 O.sub.3, ZrO.sub.2 and Y.sub.2 O.sub.3, the transition metal oxides MnO, CoO, NiO and FeO, and MgO.

Abstract: There is disclosed a venting system adapted to direct air flow over the inside of an eyeglass lens to minimize a tendency to fog. The venting system may be an integral part of a pair of eyeglasses, or may be incorporated in a separate member, in particular a shielding cassette, adapted to be used with a pair of eyeglasses.

Abstract: An ophthalmic lens embodying an organic plastic lens member having a refractive index of at least 1.56 and being the cured product of a monomeric formulation. The formulation contains a resin monomer base, a curing agent selected from aromatic anhydrides, aromatic diamines, thioamides and thioamines, and a refractive index enhancing additive selected from alkyl or aromatic diols or thiols and transition metal alkoxides. The organic plastic lens member may be an integral, monofocal lens, or a segment embedded in a cavity in the front, convex surface of an organic plastic, major lens member having a lesser refractive index. The latter may have a thin, inorganic glass lens member adhered to its front, convex surface to produce a glass-plastic, laminated, multifocal lens structure.

Abstract: A photosensitive borosilicate glass which consists essentially in calculated weight percent on an oxide basis of 20-80% SiO.sub.2, 8-40% B.sub.2 O.sub.3, 0-6% Li.sub.2, 0-28% Na.sub.2, 0-25% K.sub.2 O, the total Na.sub.2 O+K.sub.2 O being 10-28%, 0-18% Al.sub.2 O.sub.3 and minor amounts of photosensitizing agents silver, cerium oxide, antimony oxide and bromine and/or chlorine, the cation ratio of R.sub.2 O--Al.sub.2 O.sub.3 to B.sub.2 O.sub.3 being at least 0.6.

Abstract: Non-spherical bodies having a circular cross-section that is 0.5-200 microns in diameter and that are longer than the cross-sectional diameter, and a method of making such bodies by reshaping non-spherical bodies. The method comprises positioning a monolayer of unsintered, deformable, spherical bodies between smooth facing surfaces on two flat formers, and applying a mild shearing force to at least one of the formers.

Abstract: A transparent glass exhibiting a burgundy color, and glassware molded therefrom, the glass consisting essentially of 0.3 to 2.2% by weight of manganese oxide, calculated as MnO.sub.2, in a soda lime silicate base glass, exhibiting chromaticity coordinates (Illuminant C) falling within the rangesx=0.3200 to 0.3700y=0.3300 to 0.3080Cap Y=25 to 72 and having impurity levels for NiO and Fe.sub.2 O.sub.3 not exceeding 100 ppm and 500 ppm, respectively.

Abstract: A family of lead silicate glasses particularly adapted to drawing of tubing for use in the neck section of a cathode ray tube. The glasses have internal liquidi below 750.degree. C., electrical resistivities over 8.0 ohm-cm (Log R.sub.350.degree. C.) and linear x-ray absorption values of at least 95 cm.sup.-1 at a wavelength of 0.6 Angstrom units. Their compositions consist essentially of, in weight percent as calculated on an oxide basis, 46-51% SiO.sub.2, 0.5-2% Al.sub.2 O.sub.3, 0.3-3% Na.sub.2 O, 9-13% K.sub.2 O, 2.5-6% SrO, 1-4% BaO, 30-33% PbO, 0-2% ZnO and 0.3-1% Sb.sub.2 O.sub.3.

Abstract: A method of dealkalizing a glass body that contains at least one alkali metal ion as either an impurity or an intentionally added constituent. The method involves intimately contacting the glass body with a hydrogen-ion-producing anode and an oxide receptor for the alkali metal ion as a cathode and exposing the glass body and electrode assembly to hydrogen while the assembly is at an elevated temperature.

Abstract: There is disclosed a method for molding near net-shape glass articles. In general, the inventive method comprises two basic steps; (1) heating the receiving and opposing molding surfaces of a mold apparatus to different predetermined temperatures; and, (2) bringing the receiving and opposing molding surfaces of the mold into essential contact with each other and pressing a delivered molten glass charge for a time sufficient to remove enough heat from the charge such that the temperatures of the molding surfaces and the glass charge are all nearly at equilibrium below the glass charge's softening point. The press time and the differential mold heating combine to achieve symmetric heat removal, i.e. causing all temperatures to reach equilibrium at nearly the same time.

Abstract: A transparent glass-ceramic and an article of cookware formed therefrom. The glass-ceramic has as its primary crystal phase a beta-quartz solid solution, contains an amount of TiO.sub.2 effective as a nucleating agent up to about 6%, and has a color package composed of 50 to 150 ppm Co.sub.3 O.sub.4, 50 to 250 ppm NiO and 400 to 1000 ppm Fe.sub.2 O.sub.3 that provides a burgundy color.

Abstract: A fusion sealing material containing a mill addition, a sealing tape cast from the material, and a method of producing the tape. The material is composed of a low temperature glass, a mill addition that lowers the effective coefficient of thermal expansion of the glass in a seal and an organic medium. The sealing tape is prepared by hot mixing the solids with a liquefied medium, such as a high melting alcohol, and casting the hot mix onto a cold sheet to immediately solidify the medium.

Abstract: Glass or crystal particles of nanocrystalline size having a minor dimension of 0.1 to 100 Angstrom units. They may be prepared by controlled thermal separation of phase-separable glasses. Preferred crystal forms are zinc pyrophosphate and lithium disilicate. A crystallizable glass is combined with phyllosilicate particles and sintered to form an oriented composite body. During slow sintering, the crystal grows epitaxially on the phyllosilicate.

Abstract: This invention is directed toward of a glass-ceramic article consisting essentially, expressed in terms of weight percent on the oxide basis, of about 64-70% SiO.sub.2, 18-22% Al.sub.2 O.sub.3, 3.3-4% Li.sub.2 O, 2-5% ZnO, 0-2% MgO, 1.5-3.5% ZrO.sub.2, 0.5-2.5% TiO.sub.2, 3.5-4.5% ZrO.sub.2 +TiO.sub.2, 0.5-1.5% As.sub.2 O.sub.5 and 0-0.5% SnO.sub.2. The glass-ceramic article disclosed herein, is comprised of adjacent areas which exhibit visible transmissions ranging from transparent-to-opaque. The transparent areas are clear, transparent and essentially colorless and contain stuffed .beta.-quartz as essentially the sole crystal phase. On the other hand, the translucent-to-opaque areas contain .beta.-spodumene as the predominant crystal phase with a minor amounts of gahnite crystals resulting from the thermal transformation of said stuffed .beta.-quartz. This gahnite phase is present in an amount sufficient to compensate for the transformation of said stuffed .beta.-quartz to .beta.

Abstract: A family of lanthana borate glasses modified by iron oxide to become semiconducting. The glasses resist devitrification, exhibit bulk resistivities in the range of 10.sup.8 -10.sup.12 ohms-cm and possess other properties to make them particularly suitable for use in producing perforated plates for such applications as multichannel plates. The glass consist essentially of 40-55% by weight La.sub.2 O.sub.3, 25-40% B.sub.2 O.sub.3 and 10-30% Fe.sub.2 O.sub.3.