Abstract: This invention relates to the preparation of thermally stable, chemically durable, heavy metal oxide glasses exhibiting good transmission of infrared radiation to wavelengths of about 7 microns consisting essentially, in weight percent, of 7.5-25% Ga.sub.2 O.sub.3, 70-92% Bi.sub.2 O.sub.3, and 0.25-12% R.sub.2 O, wherein R.sub.2 O consists of at least one alkali metal oxide selected from the group consisting of Na.sub.2 O and K.sub.2 O.

Abstract: This invention is particularly directed to the production of glass-ceramics specifically designed for bonding hard refractory particulate ceramics into dense, mechanically strong composite bodies. The inventive glass-ceramics are crystallized in situ from divalent metal borate glasses. The invention is particularly drawn to composite articles where Al.sub.2 O.sub.3 particles comprise the hard refractory ceramic and the inventive glasses react therewith to form an exceptionally strong bond therebetween accompanied with the development of divalent metal aluminoborate crystals.

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: The present invention is directed to a method for synthesizing highly crystalline pollucite articles at temperatures not exceeding 1650.degree. C. The method comprises two general steps:(a) a glass frit is prepared having a composition varying from approximately the stoichiometry of Cs.sub.2 O.2SiO.sub.2 to approximately the stoichiometry of Cs.sub.2 O.4SiO.sub.2 with, optionally, up to 5% Al.sub.2 O.sub.3 ; and(b) that glass frit is reacted at a temperature between about 1000.degree.-1650.degree. C. with an Al.sub.2 O.sub.3 -containing material in sufficient amounts to yield a final product having a stoichiometry approximating that of pollucite.

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 thallium germanate, tellurite, and antimonite glasses possessing high optical nonlinearity, as well as good visible and infrared transmission, making them suitable materials for the fabrication of active optical devices.

Abstract: This invention is directed to the formation of transparent, surface-crystallized glass bodies exhibiting very high mechanical strengths, but low frangibility, consisting essentially, in weight percent, of 2.5-5.0% Li.sub.2 O, 5-10% MgO, 3.5-12%, ZnO, 16-28% Al.sub.2 O.sub.3, and 50-70% SiO.sub.2.

Abstract: This invention is directed to the production of a laminated heat release or pressure release decal for application to a surface of an article which comprises:(a) a support layer comprising a disposable release film;(b) a stretchable abrasion resistant layer, and(c) a heat activated or pressure sensitive adhesive layer atop said abrasion resistant layer.Where desired, a second support layer comprising a disposable release film can be located on the side opposite from the first support layer.

Abstract: This invention is directed to the production of glasses demonstrating working temperatures below about 450.degree. C., transition temperatures no higher than about 350.degree. C., and good resistance to attack by mild aqueous alkaline solutions consisting essentially, expressed in terms of mole percent on the oxide basis of______________________________________ Li.sub.2 O 0-25 ZnO 25-50 Na.sub.2 O 5-20 Al.sub.2 O.sub.3 0-3 K.sub.2 O 0-12 P.sub.2 O.sub.5 25-37 Li.sub.2 O + Na.sub.2 O + K.sub.2 O 15-35 SnO 0-10 ______________________________________to which are included 0.5-8% Cl and 0-5% F., as analyzed in weight percent.

Abstract: This invention is principally directed to the preparation of transparent glass-ceramic articles which, when very rapidly crystallized in situ from precursor glass articles in plate form, exhibit very minimal distortion. The glass-ceramic articles contain .beta.-quartz solid solution as the predominant crystal phase and consist essentially, in weight percent, of______________________________________ SiO.sub.2 65-70 MgO + BaO + SrO 1.1-2.3 Al.sub.2 O.sub.3 18-19.8 ZrO.sub.2 1.0-2.5 Li.sub.2 O 2.5-3.8 As.sub.2 O.sub.3 0-1.5 MgO 0.55-1.5 Sb.sub.2 O.sub.3 0-1.5 ZnO 1.2-2.8 As.sub.2 O.sub.3 + Sb.sub.2 O.sub.3 0.5-1.5 TiO.sub.2 1.8-3.2 Na.sub.2 O 0-<1.0 BaO 0-1.4 K.sub.2 O 0-<1.0 SrO 0-1.4 Na.sub.2 O + K.sub.2 O 0-<1.0 BaO + SrO 0.4-1.4 2.8Li.sub.2 O + 1.2ZnO/ >1.8 5.2MgO ______________________________________The preferred glass-ceramics contain 0.1-1.0% V.sub.2 O.sub.5.

Abstract: This invention is directed to the formation of blue-to-black transparent glass-ceramic articles containing .beta.-quartz solid solution as essentially the sole crystal phase present therein. The articles are prepared by heat treating reduced precursor glass articles consisting essentially, in weight percent, of 2.5-5% Li.sub.2 O, 1-2% MgO, 18-30% Al.sub.2 O.sub.3, 2-4% TiO.sub.2, 1-4% ZrO.sub.2, 48-70% SiO.sub.2, 1-12% P.sub.2 O.sub.5, and 0-2% ZnO. The precursor glass articles are placed in a reduced state through the inclusion of a sufficient amount of a hydrogen-containing phosphate and/or chloride and/or Ti.sub.2 O.sub.3 to obtain about 0.2-6% of the total titanium content in the form of Ti.sup.+3 ions.

Abstract: This invention is directed to the production of transparent glass-ceramic articles demonstrating linear coefficients of thermal expansion of less than 10.times.10.sup.-7 /.degree.C. and exhibiting a blue or gray coloration. The articles are prepared by heat treating reducing precursor glass articles consisting essentially, in weight percent as calculated from the batch, of 2.5-3.5% Li.sub.2 O, 1.5-2.5% MgO, 17.75-20% Al.sub.2 O.sub.3, 64-70% SiO.sub.2, 2-4.5% TiO.sub.2, 1-2% ZrO.sub.2, 0-2% BaO, and 0.2-0.5% Cl, wherein alkali metals other than Li.sub.2 O, alkaline earth oxides other than MgO and BaO, ZnO, and B.sub.2 O.sub.3 are essentially absent therefrom.

Abstract: This invention is directed to a method of forming optical devices composed of a photonucleable, crystallizable, lithium silicate glass body having at least one glass lens integral with and rising above at least one surface thereof, the lens being surrounded by a crystallized glass matrix, and optical devices produced by such method. The inventive method comprises subjecting the crystallized body to an ion exchange reaction wherein sodium and/or potassium ions from an external source are exchanged for lithium ions within the surface of the glass lens, the exchange reaction being conducted at a temperature of about 25.degree.-125.degree. C. above the annealing point of the glass for a time sufficient to produce a lens having an axial height in excess of 100% greater than that of lenses produced solely by selectively crystallizing a photonucleable, lithium silicate glass body.

Abstract: Two composition areas of partially stabilized ZrO.sub.2 /HfO.sub.2 alloys have been discovered which exhibit pseudo-plasticity through the presence of transformation bands and with the substantial absence of microcracking. The first area consists essentially, in mole percent, of 0.5-8% of at least one toughening agent in the indicated proportion selected from the group consisting of 0-8% YNbO.sub.4, 0-8% YTaO.sub.4, 0-8% RENbO.sub.4, 0-8% RETaO.sub.4, 0-8% YVO.sub.4, 0-8% REVO.sub.4, 0-8% MgWO.sub.4, 0-8% MgMoO.sub.4, 0-8% CaWO.sub.4, 0-8& CaMoO.sub.4, and 0-8% SnO.sub.2, and 0.5-10% of at least one stabilizer oxide in the indicates proportion selected from the group consisting of 0-3.5% Y.sub.2 O.sub.3, 0-3.5% Sc.sub.2 O.sub.3, 0-3.5% RE.sub.2 O.sub.3, 0-10% CeO.sub.2, 0-10% TiO.sub.2, 0-10% SnO.sub.2, 0-10% CaO, and 0-10% MgO, with the remainder ZrO.sub.2 /HfO.sub.2 alloy. The second area consists essentially, in mole percent, of 8-16% CeO.sub.2 and 0.25-5% Nb.sub.2 O.sub.5 and/or Ta.sub.2 O.sub.

Abstract: This invention is directed to the preparation of alloy articles consisting essentially of glass and/or glass-ceramic and an organic thermoplastic or thermosetting polymer having a working temperature compatible with that of the glass and/or the precursor glass for the glass-ceramic. The glass and polymer are combined at the working temperature to form an intimate mixture; i.e., the glass and polymer are in a sufficiently fluid state to be blended together to yield a body exhibiting an essentially uniform, fine-grained microstructure wherein, desirably, there is at least partial miscibility and/or a reaction between the glass and the polymer to promote adhesion and bonding therebetween. A body is shaped from the mixture and cooled to room temperature.

Abstract: This invention relates to the production of high purity fused silica glass through oxidation or flame hydrolysis of a vaporizable silicon-containing compound. More particularly, this invention is directed to the use of vaporizable, halide-free compounds in said production. In the preferred practice, a polymethylsiloxane comprises said vaporizable, halide-free compound.

Abstract: A glazing device, and a method for using such device to apply a surface glaze to a dental construct. The device includes glazing material associated with a shrinkable, hollow carrier. The method includes associating glazing material with a hollow carrier composed of a shrinkable and removable material, assembling the construct and carrier with the construct positioned within the carrier, shrinking the carrier onto the construct, removing the carrier, and maturing the material to a glaze. The device and method find particular application in applying coloration, either uniformly or in a pattern, to a dental construct.

Abstract: A method of applying a surface glaze to a dental construct. The method includes associating glazing material with a carrier composed of a highly flexible and removable material, assembling the construct and carrier with the construct positioned within the carrier, forcing the carrier onto the construct by differential fluid pressure, removing the carrier, and maturing the glazing material to a glaze. The method finds particular application in applying coloration, either uniformly or in a pattern, to a dental construct.

Abstract: This invention is directed to the preparation of silver halide-containing photochromic glasses exhibiting refractive indices between 1.585-1.610, Abbe numbers higher than 41, and densities less than 2.80 g/cm.sup.3 generally consisting essentially, in weight percent, of:______________________________________ SiO.sub.2 43-52 SrO 0.8-9 B.sub.2 O.sub.3 12.5-18 BaO 1-9 Al.sub.2 O.sub.3 0-3 K.sub.2 O 2-9 ZrO.sub.2 3-8 TiO.sub.2 2-8 Li.sub.2 O 1.5-3.5 Ag 0.100-0.175 Na.sub.2 O 0.3-3 Cl 0.140-0.350 Nb.sub.2 O.sub.5 4-9 Br 0.093-0.180 MgO 0-5 CuO 0.0080-0.

Abstract: This invention is particularly directed to the production of glass molds for use in press molding optically finished lenses. The inventive glass compositions consist essentially, in mole percent, of 34-56% ZnO, 4-14% Al.sub.2 O.sub.3, 40-52% P.sub.2 O.sub.5, and up to 15% total of optional modifying oxides including up to 5% Li.sub.2 O and/or Na.sub.2 O and/or K.sub.2 O, up to 5% Sb.sub.2 O.sub.3, and up to 15% total of CaO and/or SrO and/or BaO.