Abstract: This invention contemplates a near net-shape method of making thin glass-ceramic articles possessing substantially uniform thickness and parallel opposing surfaces comprising the steps of: (a) heating the receiving and opposing molding surfaces of a mold to predetermined different temperatures; (b) bringing the receiving and opposing molding surfaces of the mold into close proximity to each other to press a delivered charge of molten glass to fill said mold, while thermally providing and maintaining a substantially parallel fit between the receiving and opposing surfaces of the mold, to achieve substantially uniform thickness in the pressed charge, (c) pressing the glass charge for a time sufficient to remove enough heat from the glass charge that the temperatures of the molding surfaces and the glass article surfaces are all nearly at equilibrium, wherein the press time and mold temperature differential combine to result in symmetric heat removal thereby causing all the aforementioned temperatures to reach e

Abstract: There are disclosed a method of bonding components having substantially different coefficients of thermal expansion, and composite articles thus produced. The components are bonded with the cured product of an adhesive formulation composed essentially of a hydrogenated epoxide, an acrylate or blocked isocyanate end-capped urethane oligomer and an amine curing agent. Optionally, the formulation may contain an accelerator, an epoxy diluent and other minor ingredients.

Abstract: In a mold apparatus, the receiving molding surface and the opposing molding surface are each mounted coaxially and in sliding fashion within an alignment means. Both of these alignment means have an equal number of spaced apart alignment pads which are positioned such that opposing pads will be in cooperable engagement with each other during pressing.Utilizing the disclosed apparatus, a method for molding precisely shaped articles, such as magnetic memory disc substrates which require precisely parallel, opposite molded surfaces, is described. Simply stated, the method utilizes the alignment pads' thermal expansion characteristics to induce a controlled level of thermal distortion to obtain pad lengths which result in parallel opposing molding surfaces.

Abstract: A composite article, such as a telescope mirror blank, comprising a solid glass body and a supporting network structure, the structure being composed of a network of interlocking struts frit sealed to one another and to the face plate. The article is characterized in that sufficient of the glass body is incorporated in particulate form in the struts to maintain an average expansion mismatch (-50.degree. C. to +50.degree. C.) between the network structure and the glass body of no more than 0.15 ppm/.degree.C.

Abstract: An improvement in the epoxy plastic element of a laminated, glass-plastic, ophthalmic lens structure, and a method of effecting the improvement, are disclosed. The improved element is cast from a casting mix in which the ingredients are maintained in certain relationships to each other to provide an optically clear casting essentially free of striations. The cast material is gelled at a low temperature not over about 100.degree. C., and may then be cured at a temperature up to 200.degree. for a period of at least two hours.

Abstract: A cathode ray tube faceplate glass that is essentially free from fluorine and the oxides of lead arsenic and zirconium, exhibits linear X-radiation absorption coefficients of at least 28 cm.sup.-1 at a wavelength of 0.6 Angstroms and at least 8.5 cm.sup.-1 at 0.3 Angstroms, undergoes essentially no "browning" discoloration when subjected to high velocity electrons, has a viscosity at the internal liquidus of at least 100,000 poises (10,000 Pa.s), has a coefficient of thermal expansion (25.degree.-300.degree. C.) in the range of 97-100.times.10-7/.degree. C., has an annealing point not lower than about 500.degree. C. and a strain point not lower than about 455.degree. C., has an electrical resistivity expressed in log R, that is greater than 9 at 250.degree. C. and greater than 7 at 350.degree. C., the glass consisting essentially, expressed in terms of weight percent as oxide basis, of______________________________________ SiO.sub.2 60-65 SrO 8-12 Al.sub.2 O.sub.3 0-3 BaO 8-12 Na.sub.2 O 6.

Abstract: A method of employing soot casting technology in the production of sintered, metal sulfide, monolithic bodies, such as zinc sulfide bodies, is disclosed. The method comprises forming a colloidal dispersion from submicron particles of the metal sulfide, gelling the colloidal dispersion, drying and sintering the gel. By sintering in either a sulfidizing or reducing atmosphere, atomic vacancies are created which render the material non-stoichiometric and lead to a dense, sintered body.

Abstract: A method of producing a pure enstatite material involves dissolving thermally decomposable magnesium and silicon compounds, generating an aerosol from the solution(s), subjecting the aerosol droplets to a thermal influence to convert the droplets into solid particles, dispersing the particles in an organic liquid to form a colloidal sol, subjecting the sol to a gelling agent to form a semi-solid gel, drying the gel and sintering the dried gel to a dense enstatite body.

Abstract: A method of producing a blank for the primary member of a glass mould in which an organic polymer, multifocal, ophthalmic lens is cast. A glass major element is formed that has a raised countersink zone on one surface, the remainder of the glass major element being thinner than the countersink zone, but of such thickness that it can form the far vision surface of a mould. A countersink is formed in the countersink zone and a segment element is formed and fused in the countersink. This forms a lens mould assembly which, when ground and polished to the predetermined far vision curvature and countersink size, produces a mould in which an organic lens may be cast.

Abstract: There is disclosed a sealing material based on a lead sealing glass having a mill addition of a crystalline material having the crystalline structure of magnesium pyrophosphate. The effective coefficient of thermal expansion in a seal is substantially reduced by the mill addition, thereby permitting use with low expansion materials.

Abstract: Mill additions are disclosed which lower the CTE of, and are compatible with, tin-phosphorus oxyfluoride glasses. The sealing materials provide fusion-type seals having a CTE not over about 110.times.10.sup.-7 /.degree.C. and a sealing temperature not over about 350.degree. C.Also disclosed is a family of glass compositions in the tin-phosphorus oxyfluoride system that exhibit very low glass transition temperatures and coefficients of thermal expansion not over about 160.times.10-7/.degree.C. (25.degree.-150.degree. C.). In addition to the four basic elements, the glasses contain up to 11% Nb, and may additionally contain up to 10%, taken individually or in combination, of V, Fe and/or Mo to further decrease the Tg and CTE values.

Abstract: A glazing device, and a method for using such device to apply a surface glaze to a dental construct, are disclosed. The device comprises glazing material associated with a shrinkable, hollow carrier. The method comprises 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 protecting a glass surface from damage, particularly where a stack of glass sheets is thermally processed at elevated temperatures. The method involves applying a coating of an inert, refractory material in the form of submicron particles to at least one of two opposed glass surfaces.

Abstract: The instant invention is directed to the production of opaque glass-ceramic articles containing canasite crystals as the predominate crystal phase exhibiting strong bright colors. The desired color is obtained through the addition of a colorant system to the precursor glass composition utilized for the production the canasite glass-ceramic.Opaque glass ceramic articles exhibiting bright colors ranging from purple-to-blue-to-green are obtained through the addition of a colorant system consisting essentially, expressed in weight percent, of about 0.02%-1.5% total of at least one member selected from the group consisting of Cr.sub.2 O.sub.3 and Co.sub.3 O.sub.4, with the maximum amount of either member being about 1.0%.Another embodiment is directed towards the production of opaque glass-ceramic articles exhibiting strong bright colors yellow-to-orange-to-red-to-brown colors.

Abstract: A color package is disclosed that provides a light beige tint in potassium fluorrichterite glass-ceramic materials containing a cristobalite secondary crystal phase. The package includes Fe.sub.2 O.sub.3, NiO, Se and, optionally, cobalt oxide within limited ranges.

Abstract: There is disclosed an improvement of the three layer laminated lens structure of U.S. Pat. No. 4,793,703 whereby the adhesive inerlayer is more tightly bonded to the outer plastic and glass layers by reactive groups on the surfaces of each layer. This controls a problem of delayed delamination.

Abstract: There is disclosed a family of alkali-free, lead silicate glasses having properties that make them particularly suitable for use in producing perforated plates for such applications as multichannel plates. In addition to lead oxide and silica, the glasses contain ZnO, BaO, CaO and, under certain circumstances, MgO.

Abstract: The present invention is directed to the preparation of glass-ceramic articles exhibiting an apparent annealing point of at least 1200.degree. C. and containing slawsonite crystallization consisting essentially, in weight percent, of 10-54% SrO, 10-40% Al.sub.2 O.sub.3, 36-55% SiO.sub.2, and up to 25% total of at least one alkaline earth metal oxide in the indicated proportion of 0-10% MgO, 0-15% CaO, and 0-20% BaO.

Abstract: Bismuth-containing temperature-stable dielectric ceramics are disclosed herein that are stable over a wide range of frequencies, and thus are suitable for ceramic capacitors and microwave dielectrics. This class of materials is defined by the formula Bi.sub.2 O.sub.3 xTiO.sub.2 wherein x ranges up to 7 and the Ti.sup.4+ ion may be replaced with mixed ions of equivalent charge, thus maintaining charge balance. Suitable replacements for the Ti.sup.4+ ion are: A.sub.1/3.sup.2+ B.sub.2/3.sup.5+, R.sub.2/3.sup.3+ C.sub.1/3.sup.6+, A.sub.1/2.sup.2+ C.sub.1/2.sup.6+, R.sub.1/2.sup.3+ B.sub.1/2.sup.5+, M.sub.1/4.sup.1+ B.sub.3/4.sup.5+, and M.sub.2/5 .sup.1+ C.sub.3/5.sup.6+ ; where M.sup.+ is selected from the group consisting of Li.sup.+, Na.sup.+, K.sup.+, Cu.sup.+, and Ag.sup.+ ; A.sup.2+ is selected from the group consisting of Mg.sup.2+, Zn.sup.2+, Ni.sup.2+ , Co.sup.2+, Cu.sup.2+, and Cd.sup.2+ ; R.sup.3+ is selected from the group consisting of Cr.sup.3+, Mn.sup.3+, Fe.sup.3+, Al.sup.3+, Ga.sup.3+, Zn.sup.