Abstract: Ultraviolet transmitting glasses exhibiting coefficients of thermal expansion between 46-52.times.10.sup.-7 /.degree. C. and transmittances at a thickness of 1 mm of at least 80% at a wavelength of 254 nm which are essentially free of fluoride and consist essentially, in mole percent, of 60-70% SiO.sub.2, 16-20% B.sub.2 O.sub.3, 1-8% Al.sub.2 O.sub.3, 1-6% Li.sub.2 O, 2.5-5% N.sub.2 O, 0-3% K.sub.2 O, and 0-25% Cl, wherein the mole ratio R.sub.2 O:R.sub.2 O.sub.3 is greater than 0.3, but less than 0.5.

Abstract: This invention is directed to the preparation of fluoride-containing glasses wherein, when exposed to aqueous solutions, fluoride will be leached therefrom in a controlled manner over a long period of time and which can be melted and formed with little loss of fluorine through volatilization. The glasses are essentially free from alkali metal oxides and heavy toxic metals and consist essentially, in weight percent, of:SiO.sub.2 : 41.4-55.9BaO: 24.7-33.6Al.sub.2 O.sub.3 : 5.6-11B.sub.2 O.sub.3 : 6.5-10.

Abstract: A telescope mirror blank having a supporting network core composed of sintered ceramic struts, and a method of forming such core from a thermally crystallizable, powdered glass and as a separate component from the faceplate, are disclosed. Optionally, the mirror faceplate may be formed in a similar manner.

Abstract: There are disclosed fluoroborosilicate glasses that are particularly adapted to being drawn with lead silicate core glasses to produce clad glass fibers useful in forming fiber optic bundles to be incorporated in night vision equipment. The cladding glass has a refractive index not over about 1.45 and a coefficient of thermal expansion not over about 120.times.10.sup.-7 /.degree.C. The clad fiber has a numerical aperture approximating or equal to one.

Abstract: This invention is directed to the preparation of glass articles exhibiting a relatively broad band of high contrast polarizing properties in the infrared region of the radiation spectrum from glasses containing silver halide particles selected from the group consisting of AgCl, AgBr, and AgI. The inventive method comprises the following five general steps:(a) melting a batch for a glass containing silver and at least one halide selected from the group consisting of chloride, bromide, and iodide;(b) cooling and shaping said melt into a glass article of a desired configuration;(c) subjecting said glass article to a temperature at least above the strain point, but not in excess of 75.degree. C. above the softening point of the glass, for a sufficient length of time to cause the generation of silver halide particles therein selected from the group consisting of AgCl, AgBr, and AgI, said particles ranging in size between about 200-5000 .ANG.

Abstract: There is disclosed a maximum reading, temperature measuring device, such as a clinical thermometer, composed of a bulb containing an expandable liquid, such as mercury, an elongated tube with a central bore into which the liquid expands when heated, and a flow control member positioned intermediate the tube and bulb and sealed to each. The flow control member is a short length of tubing having a central bore that is sufficiently small in diameter to form a constriction that inhibits reverse flow of the liquid.

Abstract: A method is disclosed for constructing a glass mould, and particularly the primary glass mould member, for use in casting multifocal, ophthalmic lenses from organic polymers. The method comprises pressing a glass segment with a cavity, removing the base portion of the segment to form a perforation, mounting the perforated segment on a second glass body, and fusing the assembly to form a blank for finishing. For trifocal lenses, a composite, perforated segment is formed and sealed in a depression on a major element to form a blank.

Abstract: Metallizing pastes, for forming thick film circuitry on low expansion substrates in electronic devices, are disclosed. The paste contains a glass powder that crystallizes on firing to a glass-ceramic in which lead titanate is the primary crystal phase.

Abstract: Secondary discharge slots are cut into the face of newly made or used extrusion dies such that the secondary discharge slots communicate transversely and longitudinally with primary discharge slots but do not communicate with the feed holes. The novel extrusion die arrangement is set forth for the production of ceramic honeycomb structures which produce a greater number of cells per square inch, protrusions on the cell walls, or a combination of both dependent upon the Primary Slots' Volume to Secondary Slots' Volume ratio. The secondary discharge slots can produce honeycomb substrates with much greater surface areas, using an extrusion die with a significantly reduced number of feed holes and a greater number of discharge slots.

Abstract: There is disclosed a family of low dielectric, copper-exuding, boroaluminosilicate glasses particularly adapted to use in forming substrates for electronic devices such as integrated circuits. The glasses are capable of exuding copper oxide, have a coefficient of thermal expansion of 30-35.times.10.sup.-7 at 300.degree. C., a dielectric constant not over 5.0 at 100 KHz, a loss tangent not over 0.003 at 100 KHz and consist essentially, in percent by weight, of 56-64% SiO.sub.2 18-25% B.sub.2 O.sub.3, 3-11% Al.sub.2 O.sub.3, 0-2% CaO, 0-2% Li.sub.2 O, 0-1% K.sub.2 O, the Li.sub.2 O+K.sub.2 O+CaO being 1.5-3% and 1-20% CuO.

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: The present invention is related to transparent, fast darkening and fading photochromic glasses.The glasses contain SiO.sub.2, B.sub.2 O.sub.3, Al.sub.2 O.sub.3, ZrO.sub.2, Li.sub.2 O, Na.sub.2 O, K.sub.2 O, MgO, CaO, SrO, BaO, ZnO, La.sub.2 O.sub.3, Nb.sub.2 O.sub.5, TiO.sub.2 as base glass components, Ag, Br, Cl, CuO as photochromic elements, with, optionally, Sb.sub.2 O.sub.3, As.sub.2 O.sub.3, and SnO.sub.2 as colorants to impart a brown color at darkening.The glasses have a refractive index greater than 1.585, an Abbe number greater than 42, and a density lower than about 2.80 g/cm.sup.3.

Abstract: There is disclosed a low expansion glass-ceramic substrate for supporting a glass multifocal lens assembly during a fusing or sagging heat treatment. The substrate has baked on its supporting surface a paint composed essentially of titania, alumina and a mica.

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: This invention is directed to the production of oxide-boride-silicon nitride ceramics consisting essentially of ceramic bodies of oxide and boride phases which have silicon nitride added to improve the properties of the ceramic body for use as wear material, durable interface material, and cutting tool inserts. The addition of Si.sub.3 N.sub.4 to the oxide-boride body provides a durable ceramic material which provides a range of cutting speeds that may be utilized in both turning and milling operations.

Abstract: This invention is directed to the production of glass-ceramic articles exhibiting an apparent annealing point in excess of 400.degree. C. and excellent resistance to moisture attack, the articles consisting essentially, in mole percent, of:______________________________________ Li.sub.2 O 5-25 ZnO 35-50 Na.sub.2 O 0-15 Al.sub.2 O.sub.3 0.75-6 K.sub.2 O 0-10 P.sub.2 O.sub.5 29-37. Li.sub.2 O + Na.sub.2 O + K.sub.

Abstract: There are disclosed fluoroborosilicate glasses that are particularly adapted to being drawn with lead silicate core glasses to produce clad glass fibers useful in forming fiber optic bundles to be incorporated in night vision equipment. The cladding glass has a refractive index not over about 1.45 and a coefficient of thermal expansion not over about 120.times.10.sup.-7 /.degree.C. The clad fiber has a numerical aperture approximating or equal to one.

Abstract: This invention is directed to the production of laminated, transparent, polarizing glass articles. The inventive method contemplates five basic steps:(1) forming parallel microgrooves on a surface of a glass support;(2) washing and drying said surface;(3) depositing on said surface a mixture of organic colorants corresponding to the three primary colors and exhibiting a nematic state to yield a coating displaying polarizing properties;(4) treating the polarizing coating with an aqueous solution of inorganic salts having an acid pH; and(5) applying a continuous, optically transparent, composite film upon the polarizing coating and bonding it thereto.

Abstract: This invention is directed to the production of glass-ceramic bodies through the sintering of finely-divided glass powders into an integral body accompanied with the generation of crystals therein. The inventive products have compositions consisting essentially, selected from the group, in weight percent, consisting of:(a) 20-30% CaO, 35-55% Al.sub.2 O.sub.3, and 20-40% B.sub.2 O.sub.3 ;(b) 30-45% SrO, 30-45% Al.sub.2 O.sub.3, and 20-35% B.sub.2 O.sub.3 ;(c) 40-55% BaO, 25-40% Al.sub.2 O.sub.3, and 15-30% B.sub.2 O.sub.3 ; and(d) mixtures thereof.The predominant crystal phase is an alkaline earth metal aluminoborate.

Abstract: This invention is directed to the preparation of two groups of glass-ceramic materials exhibiting properties rendering them especially suitable as substrates for integrated circuit packaging. The first group of materials contains gehlenite, anorthite, and akermanite as the predominant crystal phases and consists essentially, in weight percent of 1-7.25% MgO, 22-40% CaO, 18-36% Al.sub.2 O.sub.3, and 29-42% SiO.sub.2. The second group of materials contains gehlenite, anorthite, and hardystoneite as the predominant crystal phases and consists essentially, in weight percent, of 2-13% ZnO, 22-37.5% CaO, 18-34% Al.sub.2 O.sub.3, and 28-42% SiO.sub.2.