Abstract: The present invention is directed to glasses exhibiting annealing points between 682.degree.-702.degree. C., linear coefficients of thermal expansion (25.degree.-300.degree. C.) between 57-59.times.10.sup.-7 /.degree. C., and excellent resistance to attack by HCl and Na.sub.2 CO.sub.3 consisting essentially, in weight percent, of______________________________________ SiO.sub.2 56-60 Na.sub.2 O 0-3 Al.sub.2 O.sub.3 12-15 K.sub.2 O 0-3 B.sub.2 O.sub.3 5.5-7 Na.sub.2 O + K.sub.2 O 0.5-3. CaO 19-24.

Abstract: This invention is related to glasses for use as substrates in flat panel display devices; more specifically, for use as substrates in LCDs which utilize polycrystalline silicon thin film transistors. The compositions for the inventive glasses are essentially free from alkali metal oxides and consist essentially, in mole percent, of______________________________________ SiO.sub.2 64-70 Y.sub.2 O.sub.3 0-5 Al.sub.2 O.sub.3 9.5-14 MgO 0-5 B.sub.2 O.sub.3 5-10 CaO 3-13 TiO.sub.2 0-5 SrO 0-5.5 Ta.sub.2 O.sub.5 0-5 BaO 2-7 Nb.sub.2 O.sub.5 0-5 MgO + CaO + SrO + BaO 10-20.

Abstract: This invention is directed to a method for preparing glass sheet having surfaces which are essentially defect-free and equivalent in smoothness to polished glass surfaces which comprises the steps of: Two different batches of alkali-metal-free batches are melted and formed into a laminated sheet and the first glass is enclosed by the second glass. The second glass is 1000 times more soluble than the first glass. The laminate is contacted with an acid to dissolve the second glass wherein the first glass remains with essentially defect free surfaces.

Abstract: This invention is directed to glass compositions particularly designed for use as substrates in flat panel display devices and, more expressly, for use as substrates in LCDs which employ polycrystalline silicon thin film transistors. The glass compositions are essentially free from alkali metal oxides and consist essentially, in mole percent, of______________________________________ SiO.sub.2 65-76 MgO 0-5 ZrO.sub.2 0-2.5 Al.sub.2 O.sub.3 7-11 CaO 0-10 TiO.sub.2 0-3 BaO 12-19 SrO 0-10 Ta.sub.2 O.sub.5 0-3 B.sub.2 O.sub.3 0-5 MgO + 0-15 ZrO.sub.2 + 0.5-5. CaO + TiO.sub.2 + SrO Ta.sub.2 O.sub.

Abstract: This invention is drawn to heavy metal oxide glasses exhibiting high nonlinear susceptibility and infrared transmission consisting essentially, in weight percent, of 42-48% PbO, 33-44% Bi.sub.2 O.sub.3, 10-15% Ga.sub.2 O.sub.3, and up to 15% total of at least one member of the group consisting of up to 5% SiO.sub.2 and/or GeO.sub.2 and up to 15% Tl.sub.2 O. This invention also comprehends the fabrication of light guiding fibers from those glasses.

Abstract: This invention relates to glasses for use as substrates in flat panel display devices which use polycrystalline silicon thin film transistors. The compositions for those glasses are essentially free from alkali metal oxides and MgO and consist essentially, in weight percent, of:______________________________________ SiO.sub.2 63-68 BaO 4.5-10 Al.sub.2 O.sub.3 7.5-11 CaO + SrO + BaO 14-26 CaO 9.5-16 B.sub.2 O.sub.

Abstract: The invention is concerned with glasses for use as substrates in flat panel display devices which use polycrystalline silicon thin film transistors. The compositions for these glasses are essentially free from alkali metal oxides and MgO and consist essentially, in mole percent, of:______________________________________ SiO.sub.2 65-75 CaO and/or BaO 0-10 Al.sub.2 O.sub.3 6-10 B.sub.2 O.sub.3 0-5 SrO 15-26 [CaO and/or BaO] + B.sub.2 O.sub.

Abstract: This invention is directed to the production of glass substrates for use in flat panel display devices employing polycrystalline silicon thin film transistors. The compositions for these glasses are essentially free from alkali metal oxides and consist essentially,in mole percent of:______________________________________ SiO.sub.2 60-65 MgO 0-4 Al.sub.2 O.sub.3 8-10 SrO 0-12 B.sub.2 O.sub.

Abstract: The present invention relates to a method for making a glass article having at least one surface which is essentially defect-free and is at least equivalent in smoothness to a polished surface. The method includes the steps of:(a) bringing into contact with each other a body of a glass which is relatively insoluble in an acid solution and a body of a glass consisting essentially, expressed in terms of cation percent on the oxide basis, of 70-85% B.sub.2 O.sub.3, 7-20% BaO, 0-10%, PbO, 0-12% R.sub.2 O, wherein R.sub.2 O consists of Li.sub.2 O+Na.sub.2 O+K.sub.2 O, 3-15% PbO+R.sub.2 O, the glass from its setting point to room temperature having a linear coefficient of thermal expansion within about 5.times.10.sup.-7 /.degree.C. of that of the relatively insoluble glass, a strain point within 10.degree. C.

Abstract: This invention is drawn to heavy metal oxide glasses exhibiting high nonlinear susceptibility and infrared transmission consisting essentially, in weight percent, of 42-48% PbO, 33-44% Bi.sub.2 O.sub.3, 10-15% Ga.sub.2 O.sub.3, and up to 15% total of at least one member of the group consisting of up to 5% SiO.sub.2 and/or GeO.sub.2 and up to 15% Tl.sub.2 O. This invention also comprehends the fabrication of light guiding fibers from those glasses.

Abstract: This invention is directed to a method for making a soda lime glass article having at least one surface which is essentially defect free and having a smoothness at least equivalent to that of a polished surface. The method generally comprises the steps of:(a) bringing together a body of a soda lime glass and a body of a glass consisting essentially, by weight, of 0.75-7.5% Li.sub.2 O and/or 18-27% PbO, the total Li.sub.2 O+PbO not exceeding 32%, 35-50% BaO, 0-5% Al.sub.2 O.sub.3, 30-50% B.sub.2 O.sub.3, and 5-10% SiO.sub.2, said glass having a softening point between 575.degree.-650.degree. C.

Abstract: Glasses exhibiting low thermal coefficients of elastic modulus, good glass stability, low thermal expansion, and good chemical durability are provided, a first glass type including glasses consisting essentially, in weight percent on the oxide basis, of about 60-64% SiO.sub.2, 14-18% B.sub.2 O.sub.3, 8.5-10% Al.sub.2 O.sub.3, 4-7% Na.sub.2 O, and 2-12% BaO, and a second group comprising alkali silicate glasses consisting essentially, in weight percent on the oxide basis, of about 51-55% SiO.sub.2, 10-13% K.sub.2 O, 5-15% ZnO, 5-15 BaO, and 10-20% PbO.

Abstract: Glass compositions suitable for the manufacture of sheet glass for liquid crystal display (LCD) devices are disclosed, such glasses consisting essentially, in cation percent, of about 52-58% SiO.sub.2, 12.5-18% Al.sub.2 O.sub.3, 20-23% B.sub.2 O.sub.3, 0-4% MgO, 0-6% CaO, 0-6% SrO, 1-9% BaO, 8-12% MgO+CaO+Sro+BaO, -3% ZnO, and 0-1% of fining agents. These glasses have a strain point in excess of 625.degree. C., an average linear coefficient of thermal expansion in the range of about 20-60.times.10.sup.-7 /.degree.C. over the range 25.degree.-300.degree. C., an internal liquidus temperature not exceeding about 1050.degree. C., and chemical durability sufficient to exhibit a weight loss in 5% HCl at 95.degree. C. not exceeding about 10 mg/cm.sup.2 in a 24 hour period, and so offer the glass stability necessary for overflow downdraw sheet forming and the high strain point and chemical durability needed for LCD manufacture.

Abstract: This invention is concerned with the fabrication of flat panel display devices wherein a film of large crystal polysilicon is grown on a substrate. More particularly, the present invention is drawn to such devices wherein the substrate is prepared from a strontium aluminosilicate glass consisting essentially, in mole percent, of about 9-12% SrO, 9-12% Al.sub.2 O.sub.3, and 77-82% SiO.sub.2.

Abstract: This invention is directed to the fabrication of flat panel display devices wherein a film of large crystal polysilicon is grown on a substrate. More specifically, this invention is drawn to the fabrication of such devices wherein the substrate is fashioned from a phase separated glass consisting essentially of extremely fine-grained crystals homogeneously dispersed in a glass matrix, the base glass therefor being essentially free from alkali metal oxide and consisting essentially, in mole percent, of 2-6% BaO and/or SrO, 18-26% Al.sub.2 O.sub.3, and 68-80% SiO.sub.2.

Abstract: This invention is directed to the fabrication of flat panel display devices wherein a film of large crystal polysilicon is grown on a substrate. More specifically, this invention is drawn to the fabrication of such devices wherein the substrate is fashioned from a phase separated glass consisting essentially of extremely fine-grained crystals homogeneously dispersed in a glass matrix, the base glass therefor being essentially free from alkali metal oxide and consisting essentially, in mole percent, of 2-6% BaO and/or SrO, 18-26% Al.sub.2 O.sub.3, and 68-80% SiO.sub.2.

Abstract: This invention is concerned with the fabrication of flat panel display devices wherein a film of large crystal polysilicon is grown on a substrate. More particularly, the present invention is drawn to such devices wherein the substrate is prepared from a strontium aluminosilicate glass consisting essentially, in mole percent, of about 9-12% SrO, 9-12% Al.sub.2 O.sub.3, and 77-82% SiO.sub.2.

Abstract: This invention is directed to the preparation of glasses in the PbO--Ga.sub.2 O.sub.3 field exhibiting good infrared transmitting characteristics out to wavelengths of 8 microns. The binary glasses consist essentially, by weight, of about 15-28% Ga.sub.2 O.sub.3 and 72-85% PbO. However, the preferred glasses contain up to 85% Bi.sub.2 O.sub.3 and consist essentially as included within the area generally encompassed by the curve in FIG. 2.

Abstract: This invention relates to easily meltable, thermally opacifiable, dense white opal glasses which exhibit satisfactory weathering resistance and consist essentially, in weight percent, of 7-12% Na.sub.2 O, 0.8-3.8% CaO, 3-7% Al.sub.2 O.sub.3, 4-8% B.sub.2 O.sub.3, 69-75% SiO.sub.2, and 3.5-4.5% F.

Abstract: This invention is concerned with the production of glasses in the Bi.sub.2 O.sub.3 --Ga.sub.2 O.sub.3 system with, preferably, CdO which exhibit high indices of refraction and infrared transmitting capabilities to wavelengths of about 8 microns. The broadest scope of operable glasses involves, in weight percent, about______________________________________ Bi.sub.2 O.sub.3 40-90 Ga.sub.2 O.sub.3 5-30 CdO 0-35 ______________________________________with the preferred glasses consisting essentially of about ______________________________________ Bi.sub.2 O.sub.3 55-85 Ga.sub.2 O.sub.