Abstract: There are described blue luminescent glasses having the following compositions(a) 0 to 90 mole % alkali metal oxide (sodium oxide, potassium oxide, lithium oxide), individually or several together, 0 to 90 mole % alkaline earth metal oxide (magnesium oxide, calcium oxide, strontium oxide, barium oxide), individually or several together, with the proviso that the magnesium oxide and/or calcium oxide can only be present in an amount of up to 25 mole % and at least 2 mole % of alkali metal oxide and/or alkaline earth metal oxide must be present(b)7 to 95 mole % silica0 to 70 mole % boron oxide (B.sub.2 O.sub.3)0 to 85 mole % aluminum oxide(c) 0.01 to 40 mole % lead oxide (PbO).

Abstract: The present invention is directed to transparent, essentially haze-free glass-ceramic articles exhibiting moduli of rupture in excess of 10,000 psi which consist essentially, in weight percent, of 3-6% Li.sub.2 O, 17-23% Al.sub.2 O.sub.3, 1-4% B.sub.2 O.sub.3, 60-70% SiO.sub.2, 3-6% TiO.sub.2 and/or ZrO.sub.2, 25-500 ppm Cr.sub.2 O.sub.3, and 1-5 mole percent of a glass modifying oxide selected from the group consisting of 0-3% K.sub.2 O and 0-2.5% SrO and/or BaO.

Abstract: Alkali silicate glasses, pigmented with Co.sup.2+ or with Co.sup.2+ and Ni.sup.2+, and having the composition:______________________________________ SiO.sub.2 52-71% by weight PbO 2.9-16.8% by weight SnO.sub.2 0.1-1.65% by weight Na.sub.2 O 6.7-16.7% by weight K.sub.2 O 0.5-9.9% by weight Na.sub.2 O + K.sub.2 O 13.3-18.3% by weight NiO + CoO 0.1-4.4% by weight As.sub.2 O.sub.3 + Sb.sub.2 O.sub.3 0.05-0.5% by weight .SIGMA.RO 0-8.6% by weight B.sub.2 O.sub.3 0-8.5% by weight Al.sub.2 O.sub.3 0-0.55% by weight ZnO 0-10.5% by weight, ______________________________________in which R is Mg, Ca, Sr, Ba or a combination thereof, are disclosed. The alkali silicate glasses of the invention are useful as optical filter glasses.

Abstract: This invention relates to the production of glass-ceramic materials particularly suitable for use as substrates in integrated circuit packaging. The inventive glass-ceramics can be prepared from thermally crystallizable glass capable of being concurrently sintered and crystallized in situ at temperatures between about 850.degree.-1000.degree. C. to bodies exhibiting dielectric constants less than about 6, linear coefficients of thermal expansion between about 12-60.times.10.sup.-7 /.degree.C. and containing cordierite solid solution as essentially the sole crystal phase. The glass-ceramics are essentially free from Li.sub.2 O and Na.sub.2 O and consist essentially, expressed in terms of weight percent on the oxide basis of 10-25% MgO+ZnO consisting of 2-18% MgO+0-21% ZnO, 20-38% Al.sub.2 O.sub.3, 40-52% SiO.sub.2, and 2-15% total of at least one oxide in the indicated proportion selected from the group consisting of up to 8% of an alkali metal oxide selected from the group consisting of K.sub.2 O, Rb.sub.

Abstract: An optical memory element comprising a substrate with grooves functioning as grooves for, for example, controlling the position of a laser beam, wherein said substrate is composed of a glass containing SiO.sub.2 in the range of 51 to 71% by weight, Na.sub.2 O in the range of 10 to 18% by weight, K.sub.2 O in the range of 0 to 8% by weight, Al.sub.2 O.sub.3 in the range of 12 to 22% by weight, and B.sub.2 O.sub.3 in the range of 0 to 9% by weight.

Abstract: There are described luminescent glasses having the following compositions(a) 0 to 80 mole % alkali metal oxide (sodium oxide, potassium oxide, lithium oxide), individually or several together, 0 to 30 mole % alkaline earth metal oxide (magnesium oxide, calcium oxide, strontium oxide, barium oxide), individually or several together, and at least 2 mole % of alkali metal oxide and/or alkaline earth metal oxide must be present(b)7 to 90 mole % silica1 to 50 mole % boron oxide (B.sub.2 O.sub.3)1 to 30 mole % aluminum oxide(c)0.1 to 5 mole % lead oxide (PbO)0.1 to 10 mole % vandium pentoxide (V.sub.2 O.sub.5).The glasses have white, yellow, or blue luminescence, depending on the PbO and V.sub.2 O.sub.5 content, at excitation with a wave length of 254 nm.

Abstract: This invention provides a ceramic multi-layer circuit board wherein electroconductive patterns and ceramic insulating layers are piled alternately, characterized in that each ceramic insulating layer is a sintered product comprising one or more kinds of silica and a glass. Since the glass has a softening point lower than the melting point of the material of the electroconductive patterns, it enables sintering of the ceramic multi-layer circuit board at low temperatures. The silica is effective for reduction of the dielectric constant of each ceramic insulating layer.

Abstract: A liquid containing radioactive ions is purified (decontaminated) by contacting the same with an inorganic ion exchange composition having ion exchange sites which can be occupied by the radioactive ions from the liquid. The ion exchange composition is a mixture of an ion exchange medium and an additive which is relatively inert to the ion exchange process and which is a sintering aid for the ion exchange medium designed to lower the sintering temperature of the ion exchange composition. The ion exchange composition may be disposed within a suitable container (e.g., cannister), e.g., made of 304L stainless steel or Inconel 601 and the ion exchange process may be carried out in such container. Alternatively, the ion exchange medium can be employed without being previously admixed with the additive. The additive, if desired, can be admixed at a later stage with the contaminated medium.

Abstract: A glass frit comprising about 60% by weight of glass formers, 30% by weight of monovalent fluxes and 10% by weight of divalent fluxes; the glass formers consisting essentially of SiO.sub.2 and B.sub.2 O.sub.3 ; the monovalent fluxes consisting essentially of Li.sub.2 O, Na.sub.2 O and K.sub.2 O; the divalent fluxes being selected from the group consisting of CaO, SrO, BaO and PbO; and trace elements not exceeding 10% by weight. Preferably the glass frit has the following composition, in terms of oxides:______________________________________ SiO.sub.2 49% B.sub.2 O.sub.3 12% Li.sub.2 O 3.6% Na.sub.2 O 14.4% K.sub.2 O 11.4% CaO 5% SrO 1.85% BaO 2.75% ______________________________________The glass frit has a coefficient of thermal expansion of 7.2.times.10.sup.-6 /.degree. F. (13.times.10.sup.-6 /.degree. C.) over the range from room temperature to 600.degree. F. (316.degree. C.). It is useable to make a slip where it can be fired at temperatures around 950.degree. F. (510.degree. C.

Abstract: High PbO-content glass in the optical range of flint and heavy flint glasses from the system SiO.sub.2 --PbO--M.sub.2 O wherein M.sub.2 O=alkali metal oxides, said glass having a minimum PbO content of 30 wt. % and a minimum M.sub.2 O content of 0.5 wt. %, are provided with enhanced chemical stability without loss of the desired optical position by replacing a portion of the SiO.sub.2 and PbO such that the glass contains 1.5-6 wt. % (TiO.sub.2 +ZrO.sub.2) and the ratio of TiO.sub.2 :ZrO.sub.2 is about 0.3-2.0.

Abstract: The glass composition in accordance with the invention is characterized by the absence of alkali metal oxides and by the presence of at least 10% by weight of barium oxide.The glass composition in accordance with the invention has favorable working properties (melting temperature below 1500.degree. C., working range in excess of 200 Celsius degrees, it is very corrosion resistant (also in a strong electric field), it is resistant to metal vapors including mercury vapor, it does not attack a phosphor and it is not subject to blackening.The glass composition in accordance with the invention is extremely suitable for use in fluorescent lamps (TL-, SL- and PL-lamps) and in projection-television face plates.

Abstract: A new type of glass, for example for use as a TL-envelope glass which as regards phosphor poisoning and Hg penetration has better properties than the present TL-envelope glasses. Phosphor poisoning occurs in particular upon fusing electrodes and bending and severing and bridging, respectively, during the manufacture of SL and PL lamps.Phosphor poisoning is controlled by incorporating little or no Na.sub.2 O in the glass. In order to nevertheless reach good processing properties, a combination of Li.sub.2 O and K.sub.2 O is used in the glass. The addition of only Li.sub.2 O or only K.sub.2 O does not result in a suitable glass.Hg penetration is controlled by the presence of a large quantity of alkaline earth metal oxides in the glass.The glass according to the invention has a good light transmission. A lamp comprising a lamp envelope of a glass according to the invention shows only a small luminous decline during operation of the lamp.

Abstract: A casting composition for making dielectric green tapes comprising a dispersion of finely divided solids of (a) a noncrystallizable glass and (b) a mixture of refractory oxides in a solution of (c) organic polymer, which is readily depolymerizable at 825.degree.-1025.degree. C. in a nonoxidizing atmosphere, dissolved in (d) volatile nonaqueous solvent.

Abstract: A dielectric composition comprising an admixture of finely divided solids comprising (a) a noncrystallizable glass of which the deformation temperature (T.sub.d) is 580.degree.-625.degree. C. and the softening point (T.sub.s) is 630.degree.-700.degree. C., and (T.sub.s -T.sub.d) is 50.degree.-75.degree. C., and (b) a refractory which is substantially insoluble in the glass at temperatures of 825.degree.-900.degree. C.

Abstract: A low expansion glass comprising, all by weight, from 55 to 65% of SiO.sub.2, from 10 to 20% of Al.sub.2 O.sub.3, from 2 to 10% of B.sub.2 O.sub.3, from 3 to 10% of MgO, from 1 to 8% of CaO, from 2 to 10% of ZnO, from 0 to 4% of R.sub.2 O where R is an alkali metal atom, and from 0 to 4% of ZrO.sub.2.

Abstract: Alkali-free glasses with low dielectric losses, thermal expansion coefficients of 3.15 to 4.97.times.10.sup.-6 /.degree.C. in the temperature range from 20.degree. to 300.degree. C., adequate acid resistance, dielectric loss factors tan .delta. of 3.94 to 24.9.times.10.sup.-4 and processing temperatures (V.sub.A) of 1132.degree. to 1280.degree. C., have the following composition (in weight percent): 52.50-60.20 SiO.sub.2, 2.80-3.80 B.sub.2 O.sub.3, 8-14 Al.sub.2 O.sub.3, 6.0-20.20 PbO, 2.0-13.5 CaO, 0-3.5 MgO, 0-8 ZnO, 0-4.7 BaO, .SIGMA.PbO, CaO, MgO, ZnO, BaO 21.10-34.0, 0-1.0 F, 0.20-0.50 Sb.sub.2 O.sub.3.

Abstract: The invention relates to the glass industry. It concerns glasses of low lead content characterized in being prepared from glass forming batches consisting essentially, in weight percent on the oxide basis of:______________________________________ SiO.sub.2 66-70 BaO 5-9.5 B.sub.2 O.sub.3 0-3 PbO 1.5-5 Al.sub.2 O.sub.3 2-4.5 MgO + CaO 0-3.5 Li.sub.2 O 0.5-1.6 As.sub.2 O.sub.3 + Sb.sub.2 O.sub.3 0-1 Na.sub.2 O 7-9.5 BaO + MgO + CaO 8-11 K.sub.2 O 5-8.5 Li.sub.2 O + Na.sub.2 O + K.sub.2 O 14.5-17 Na.sub.2 O:K.sub.2 O <1.7 ______________________________________A specific application of the invention is the fabrication of electrical devices such as light bulbs.

Abstract: A liquid containing radioactive ions is purified (decontaminated) by contacting the same with an inorganic ion exchange composition having ion exchange sites which can be occupied by the radioactive ions from the liquid. The ion exchange composition is a mixture of an ion exchange medium and an additive which is relatively inert to the ion exchange process and which is a sintering aid for the ion exchange medium designed to lower the sintering temperature of the ion exchange composition. The ion exchange composition may be disposed within a suitable container (e.g., cannister), e.g., made of 304L stainless steel or Inconel 601 and the ion exchange process may be carried out in such container. Alternatively, the ion exchange medium can be employed without being previously admixed with the additive. The additive, if desired, can be admixed at a later stage with the contaminated medium.

Abstract: The present invention is concerned with the preparation of glazes which are especially suitable for application to glass-ceramic articles containing potassium fluorrichterite as substantially the sole crystal phase. The glazes consist essentially, expressed in terms of weight percent on the oxide basis, ofSiO.sub.2 :46-50Al.sub.2 O.sub.3 :5-8ZrO.sub.2 :0.3-1Li.sub.2 O:1-2Na.sub.2 O:2-3.5K.sub.2 O:1-2CaO:1-4ZnO:2-6SrO:2-6B.sub.2 O.sub.3 :9-11PbO:20-25.

Abstract: An optical and ophthalmic glass with high refractive index, high Abbe number and low density, which is distinguished by good chemical stability, good crystallization behavior and capability for chemical hardening, comprises (in % by weight):SiO.sub.2 --47 to 75B.sub.2 O.sub.3 --1 to 20Al.sub.2 O.sub.3 --0 to 10P.sub.2 O.sub.5 --0 to 5Li.sub.2 O--0 to 15Na.sub.2 O--0 to 10K.sub.2 O--0 to 10CaO--0 to 20MgO--0 to 15SrO--0 to 4BaO--0 to 4ZnO--0 to 5TiO.sub.2 --1 to 15ZrO.sub.2 --0 to 8Nb.sub.2 O.sub.5 --0 to 5 andF----0 to 5.

Abstract: A glass for multi-focal eyeglass having a refractive index (n.sub.d) of 1.67 to 1.73, an Abbe number (.nu..sub.d) of 33 or more, a coefficient of thermal expansion of 82 to 95.times.10.sup.-7 and a softening point of 560.degree. to 640.degree. C., comprising, in % by weight,32 to 40% SiO.sub.2 +B.sub.2 O.sub.3 +Al.sub.2 O.sub.3 ;22 to 40% SiO.sub.2 ;0 to 10% B.sub.2 O.sub.3 ;0 to 4% Al.sub.2 O.sub.3 ;4 to 10% Li.sub.2 O+Na.sub.2 O+K.sub.2 O;0 to 4% Li.sub.2 O;0 to 7% Na.sub.2 O;0 to 7% K.sub.2 O;30 to 47% PbO;3 to 24% BaO+SrO+CaO+MgO+ZnO;0 to 20% BaO;0 to 15% SrO;0 to 10% CaO;0 to 8% MgO;0 to 15% ZnO; and1 to 7% ZrO.sub.2 ;wherein a weight ratio of alkali metal oxides/PbO ranges from 0.1 to 0.3.

Abstract: Alkali-free borosilicate glass have been developed having coefficients of thermal expansion (+20.degree. C. to +200.degree. C.) below 40.5.times.10.sup.-7, densities less than 3.0 g/cm.sup.3 and good visible and UV transmission, and can be produced by conventional continuous melting techniques. These glasses are particularly suitable for photomask, photovoltaic and mirror substrate applications. Their compositions comprise, in weight percent:______________________________________ SiO.sub.2 50-60% B.sub.2 O.sub.3 1-6% Al.sub.2 O.sub.3 12-15% MgO 0-2.5% CaO 0-5.1% BaO 9-10% ZnO 12-18% CeO.sub.2 0-5% As.sub.2 O.sub.3 + 0-1.5% Sb.sub.2 O.sub.3 PbO 0-1% ______________________________________Sum MgO+CaO+BaO+ZnO=21-33.5.

Abstract: A method for manufacturing the insulating layers of a glass multilayer wiring board from a mixture of (1) 30-90 wt. % of a borosilicate glass consisting of 55-75 wt. % of SiO.sub.2, 13-25 wt. % of B.sub.2 O.sub.3, 5-13 wt. % of Al.sub.2 O.sub.3, each 1-5 wt. % of PbO, MgO, and BaO, and each 1-2 wt. % of Na.sub.2 O and K.sub.2 O and (2) 70-10 wt. % of a silica glass, is provided.

Abstract: A glass composition for covering a semiconductor element. The glass composition has excellent resistance to chemicals and excellent electric characteristics. The glass composition includes 3 to 8% by weight of Al.sub.2 O.sub.3, 35 to 45% by weight of SiO.sub.2, 10 to 30% by weight of ZnO, 5 to 30% by weight of PbO, 1 to 10% by weight of B.sub.2 O.sub.3, and more than 5% but not exceeding 20% by weight of an alkaline earth metal oxide selected from the group consisting of MgO, CaO, SrO and BaO, where the maximum contents of MgO, CaO, SrO and BaO are 7% by weight, 3% by weight, 7% by weight, and 15% by weight, respectively.

Abstract: This invention is directed to spontaneous opal glasses containing an apatite opacifying phase and exhibiting a softening point of at least 740.degree. C., excellent chemical durability, and a temperature interval between the high temperature crystallization liquidus and the emulsion liquidus greater than 50.degree. C. The glasses consist essentially, in weight percent on the oxide basis, of______________________________________ SiO.sub.2 50-63 Na.sub.2 O 5.5-10 Al.sub.2 O.sub.3 10-14 K.sub.2 O 0-10 P.sub.2 O.sub.5 3.5-7 BaO 0-10 PbO 2-12 CaO 0-2.5 B.sub.2 O.sub.3 1-4 SrO 0-8 F 1.

Abstract: This invention is concerned with the preparation of thermally crystallizable enamels suitable for application to glass-ceramics, particularly glass-ceramics having coefficients of thermal expansion less than 15.times.10.sup.-7 /.degree.C. The enamels are capable of being fired to maturity simultaneously with the precursor glass body being crystallized to a glass-ceramic. The enamels consist essentially, expressed in weight percent on the oxide basis, of:SiO.sub.2 : 36-58Al.sub.2 O.sub.3 : 8.5-16CaO: 0.5-10PbO: 27-40K.sub.2 O: 0.

Abstract: An optical glass with the familiar optical position of n.sub.d >1.70 and v.sub.d >22, which differs from the familiar optical glasses of the optical position due to its lower density and good chemical stability, and is composed of (in percent by weight): SiO.sub.2 25-42, TiO.sub.2 15-35, B.sub.2 O.sub.3 0.5-7, BaO 3-13, CaO 1-3, Nb.sub.2 O.sub.5 1-20, GeO.sub.2 0-2, Al.sub.2 O.sub.3 0-4, Na.sub.2 O 7.5-15, Li.sub.2 O 0-9, K.sub.2 O 2-10, SrO 0-6, ZnO 0-5, ZrO.sub.2 0-3, and WO.sub.3 0-3.

Abstract: These objects have been attained by providing highly absorbent lead containing alkali metal silicate glasses for cathode ray tube image screens, having a linear absorption coefficient .mu. of >30 cm.sup.-1 (0.6 .ANG.) and with a high resistance to discoloration by X-ray and electron radiation, comprises, in weight percent:______________________________________ SiO.sub.2 20-65% P.sub.2 O.sub.5 + B.sub.2 O.sub.3 + Al.sub.2 O.sub.3 0-30% Li.sub.2 O 0-5% Na.sub.2 O 0-10% K.sub.2 O 0-15% MgO + CaO + ZnO 0-15% SrO 0-20% BaO 0-40% PbO 5-60% ZrO.sub.2 0-10% CeO.sub.2 0.1-5% Other Components 0-20%.

Abstract: Partially crystallizing glass solders, and stripping films using them as agents to be transferred, which are sintered at temperatures below 900.degree. C. from glass powder with granulation of less than <150 .mu.m, thereafter exhibiting thermal expansion coefficients of -23.5 to 34.3.sup..multidot. 10.sup.-7.multidot. K.sup.-1, whose crystallization temperature lies below 710.degree. C. and whose crystal phase consists predominantly of h-quartz mixed crystal phase exhibiting the following composition (in weight %): 23-44 SiO.sub.2, 20-37 Al.sub.2 O.sub.3, 5.5-11 Li.sub.2 O; 3-20 B.sub.2 O.sub.3 ; 0-36 PbO; 0-1 Na.sub.2 O; 0-1.5 K.sub.2 O; 0-0.1 F; 0-4 TiO.sub.2 ; 0-3.5 MgO; 0-2 CoO, provided B.sub.2 O.sub.3 +PbO+Na.sub.2 O+K.sub.2 O+F+TiO.sub.2 is 8.5-50.0.

Abstract: According to one aspect of the invention, there is provided glass for a photomask consisting, in weight percent, of 45 to 62% SiO.sub.2, 3 to 15% B.sub.2 O.sub.3, 12 to 25% Al.sub.2 O.sub.3, 5 to 15% MgO, 0 to 5% CaO, 0 to 5% SrO, 0 to 5% BaO, 0 to 5% ZnO, 0.5 to 5% PbO, 0 to 20% La.sub.2 O.sub.3 +Gd.sub.2 O.sub.3 +Y.sub.2 O.sub.3, 0 to 1.5% Na.sub.2 O, 0 to 1.5% K.sub.2 O, 0 to 0.5% As.sub.2 O.sub.3 and 0 to 6% Sb.sub.2 O.sub.3. This glass is easy to melt and homogenize and has good resistivity to phase separation and excellent heat resisting and refractory properties, chemical durability, ultraviolet transmittance and metal vapor deposition property. According to another aspect of the invention, there is provided glass for a photomask consisting, in weight %, 45 to 60% SiO.sub.2, 0.5 to 12% B.sub.2 O.sub.3, 10 to 22% Al.sub.2 O.sub.3, 5 to 17% MgO, 0 to 5% CaO, 0 to 8% SrO, 1.5 to 15% BaO, 1.5 to 17% ZnO, 0.5 to 10% PbO, the total content of ZnO and PbO being at least 6%, 0 to 7% Ta.sub.2 O.sub.5 +Nb.sub.

Abstract: A thallium-containing optical glass composition which contains the following oxides in the indicated proportions in mole %:______________________________________ SiO.sub.2 35-80 Tl.sub.2 O 4-26 Tl.sub.2 O + R.sub.2 O 8-42 (in which R is an alkali metal) ZnO 6-26 ZrO.sub.2 0-2 Al.sub.2 O.sub.3 0-8 SnO and/or SnO.sub.2 0-5 B.sub.2 O.sub.3 0-less than 10 ______________________________________and satisfies the following relations:O.ltoreq.K.sub.2 O.ltoreq.104.ltoreq.Na.sub.2 O+Li.sub.2 O.ltoreq.260.1.ltoreq.ZrO.sub.2 +Al.sub.2 O.sub.3 +SnO and/or SnO.sub.2 .ltoreq.

Abstract: A thallium-containing optical glass composition which comprises the following oxides in the indicated proportions in mole %: SiO.sub.2 35-80, Tl.sub.2 O 1-30, Tl.sub.2 O+R.sub.2 O (R being an alkali metal) 1-35, ZnO 0-35, GeO.sub.2 0-30, BaO 0-25, TiO.sub.2 0-20, MgO 0-20, B.sub.2 O.sub.3 0-less than 10, ZrO.sub.2 0-2, Al.sub.2 O.sub.3 0-8, SnO 0-5, CaO 0-10, SrO 0-10, PbO 0-10, La.sub.2 O.sub.3 0-5, Bi.sub.2 O.sub.3 0-8, and Ta.sub.2 O.sub.5 0-2, and satisfies the following relations:5.ltoreq.ZnO+GeO.sub.2 +BaO+TiO.sub.2 +MgO+B.sub.2 O.sub.3 .ltoreq.40,0.1.ltoreq.ZrO.sub.2 +Al.sub.2 O.sub.3 +SnO.ltoreq.8,and0.ltoreq.CaO+SrO+PbO+La.sub.2 O.sub.3 +Bi.sub.2 O.sub.3 +Ta.sub.2 O.sub.5 .ltoreq.10.

Abstract: There is described a new material for jewelry and commodities which has a relatively low density and also is low carat but resistant to oxidation and corrosion. It consists of a noble metal or alloy and 1 to 70 volume % glass, whereby as glass there is used a glass frit having a transformation temperature of 300.degree. to 500.degree. C. and a softening interval of over 80.degree. C. There is also described a process for its production.

Abstract: A borosilicate glass composition suitable for use as an eyeglass lens, characterized by having a refractive index nd.gtoreq.1.58, an Abbe number vd.gtoreq.45, a density .rho..ltoreq.2.75 g/cm.sup.3, and an excellent aptitude for chemical hardening, consisting essentially of the following composition, in weight percent:______________________________________ SiO.sub.2 51-65 B.sub.2 O.sub.3 2-14 Al.sub.2 O.sub.3 0-5 SiO.sub.2 + B.sub.2 O.sub.3 + Al.sub.2 O.sub.3 62-73 Li.sub.2 O 4-13 Na.sub.2 O 0-4 K.sub.2 O 0-4 Li.sub.2 O + Na.sub.2 O + K.sub.2 O 7-15 CaO 1-19 MgO 0-11 CaO + MgO 6-22 TiO.sub.2 0-8 ZrO.sub.2 0-9.

Abstract: A glass having a composition which would result by mixing from 20 to 80 weight percent of glass A with 80 to 20 weight percent of glass B and melting the mixture to form a homogeneous glass:______________________________________ Glass A Glass B Weight Weight Percent Percent ______________________________________ SiO.sub.2 1.8-2.2 SiO.sub.2 67-70 B.sub.2 O.sub.3 14-16.5 Li.sub.2 O 14-17 PbO 69-72 Al.sub.2 O.sub.3 4-5.5 ZnO 8.2-9.2 CaO 9-12 BaO 2.7-3.5 ______________________________________said glass having a coefficient of thermal contraction from 15.degree. C. below the annealing point to room temperature of from 106 to 115.times.10.sup.-7 /.degree.C.

Abstract: The present invention is directed to the preparation of photochromic glasses exhibiting a darkened luminous transmittance at 40.degree. C. below 35% and a five-minute fading rate at 40.degree. C. of at least 40 units of transmittance and a darkened transmittance at 25.degree. C. below 25% and a five-minute fading rate at 25.degree. C. of at least 35 units of transmittance. The glasses consist essentially, by weight, of:______________________________________ SiO.sub.2 56-60 Al.sub.2 O.sub.3 6-9 B.sub.2 O.sub.3 18-21 Li.sub.2 O >2.5-3.5 Na.sub.2 O 0.5-2.5 K.sub.2 O 5-7 ZrO.sub.2 3.75-5 PbO 0.1-0.15 Ag >0.15-0.25 Cl 0.2-0.35 Br 0.075-0.15 CuO 0.004-0.02 CeO.sub.2 0-0.5 ______________________________________wherein the levels of Ag, Br, Cl, and CuO represent values as analyzed in the glass.

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: The glass-ceramic disclosed is characterized by a lithium aluminosilicate crystal phase having a very low coefficient of thermal expansion and a residual glassy phase of substantial amount and higher coefficient of expansion, usually a borosilicate or boroaluminosilicate glass. The two phases form a dilatant system wherein the thermal expansion curve changes markedly in character at a transition point in the range of 500.degree.-750.degree. C., the crystal phase dominating below that temperature and the glass phase controlling at higher temperatures.

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: A glass enamel composition and the method of its manufacture for use in providing a decorative glass or ceramic article and which composition comprises a glass frit mixed with a nacreous pigment, the mixture being dispersed in an application medium and adapted to be applied to the surface of a glass or ceramic article and fired at a temperature whereat the glass composition fuses to form a decorative and esthetic surface on said article.

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: 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: 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: A powder having a negative coefficient of linear thermal expansion and sealing compositions containing the same are disclosed wherein the powder is a .beta.-eucryptite particle having on the surface thereof a layer of tin oxide, titanium oxide, and/or zirconium oxide.

Abstract: A pentagonal prism for use in a viewfinder of a single lens reflex camera is made of a glass whose refractive index and Abbe number are not less than 1.6 and 45, respectively. Effective optical path regions on a pair of roof surfaces of the prism are left transparent so that viewfinder light can be totally reflected at both of the roof surfaces. A light absorbing paint is coated in an upper front surface, a pair of said surfaces of the prism as well as at regions other than effective optical path region of the roof surfaces, a bottom light incident surface and a rear light exit surface of the prism. The light absorbing paint prevents the occurrence of ghost images in the view field of the viewfinder. New type glasses suited for the prism are proposed.

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.