Abstract: The invention concerns glasses characterized by the fact that they have a refractive index higher than 1.740; a dilatation coefficient .alpha., between 25 and 300.degree. C., between 65 and 70.times.10.sup.-7 /.degree.C.; and a Littleton point not exceeding 635.degree. C. but higher than 600.degree. C.; they have the following composition, expressed in weight percent of oxides:______________________________________ SiO.sub.2 23-32.0 Al.sub.2 O.sub.3 1.5-5.0 B.sub.2 O.sub.3 5-9.0 PbO 43-54.0 Li.sub.2 O 0-0.5 Na.sub.2 O 0-1.0 K.sub.2 O 0-1.0 with Li.sub.2 O + Na.sub.2 O + K.sub.2 O <1.0 BaO + SrO 4-9.0 TiO.sub.2 0-4.0 ZrO.sub.2 0-2.0 La.sub.2 O.sub.3 0-3.0 Nb.sub.2 O.sub.5 0-3.0 As.sub.2 O.sub.3 0-0.3 Sb.sub.2 O.sub.3 0-0.4 with ZrO.sub.2 + La.sub.2 O.sub.3 + Nb.sub.2 O.sub.5 1.5-4.0 ______________________________________Use for the production of segments to be used in the manufacture of multifocal lenses, particularly photochromic.

Abstract: A photochromic glass lens and method of producing such lens, the lens having a plus power and a composition consisting essentially of:______________________________________ SiO.sub.2 54-58% Ag 0.20-0.33% B.sub.2 O.sub.3 18-22% Cl 0.30-0.50% Al.sub.2 O.sub.3 7-8% Br 0.04-0.14% Li.sub.2 O 3.75-4.5% CuO 0.007-0.012% Na.sub.2 O 0-1% PbO 0-0.08% TiO.sub.2 0-2% Sb.sub.2 O.sub.3 0-0.20% ZrO.sub.2 2-4.5% K.sub.2 O 5.5-7.5% ______________________________________and wherein the mole ratio of Li.sub.2 O:Na.sub.2 O is =>9:1.

Abstract: A battery construction and a method of producing the construction. The construction comprises a ceramic separator having a honeycomb structure in which cells run lengthwise of the honeycomb and are separated by porous walls, and internal positive and negative electrodes positioned in part at least within the honeycomb structure.

Abstract: A material system and method for imparting non-stick and non-wetting properties to an inorganic article having hydroxyl groups on its surface, the system comprising a silane having the formula R.sub.n SiX.sub.4-n, wherein n is 1-2 and X is a hydrolyzable group, a colloidal metal oxide sol, and an acidified aqueous mixture with a lower alkanol.

Abstract: An optically transmissive material and the production of optically transmissive articles therefrom, in particular a bond between two optically transmissive components including optical fibers and planar devices.

Abstract: An ophthalmic filter material having a photopic transmittance (Y.sub.P) higher than the scotopic transmittance (Y.sub.S), the ratio of Y.sub.P :Y.sub.S being in the range of 2.0-4.0, a dominant wavelength within the ranges of 580-605 nm and a color purity of 60-75% whereby colors perceived through the material approximate those of the scene being viewed. A method of producing such a filter material which comprises heating a photochromic glass lens in a reducing atmosphere for a time and at a temperature that is sufficient to impart the recited characteristics to the glass surface and that is equivalent to a flowing hydrogen atmosphere, or immersing a tintable plastic solution in a dye solution for a time sufficient to impart the recited characteristics.

Abstract: A method of producing, by flame hydrolysis, a fused silica glass containing titania which comprises delivering a mixture of a silica precursor and a titania precursor in vapor form to a flame, passing the vapor mixture through the flame to form SiO.sub.2 --TiO.sub.2 particles, and depositing the particles within a furnace where they melt to form a solid glass body.

Abstract: A battery construction and a method of producing the construction. The construction comprises a ceramic separator having a honeycomb structure in which cells run lengthwise of the honeycomb and are separated by porous walls, and internal positive and negative electrodes positioned in part at least within the honeycomb structure.

Abstract: The glass-ceramic material of the present invention has the hexagonal sheet structure of hexacelsian as its primary crystal phase and exhibits x-ray diffraction patterns indicative of hexacelsian, said glass-ceramic material has a stabilized thermal expansion and an overall weight percent composition comprising: 35-55% SiO.sub.2, 5-25% Al.sub.2 O.sub.3, 5-25% MgO, 5-35% BaO, 6-14% TiO.sub.2, 0-10% ZnO, and 0-8% ZrO.sub.2.

Abstract: A method of producing a fused silica glass by thermally converting a polymethylsiloxane precursor, the lens transmitting ultraviolet radiation at wavelengths below 300 nm. without undergoing a marked absorption transition, the lens so produced, and a microlithography system employing a lens of such glass.

Abstract: A method and apparatus for treating a surface on a glass article with a fluid. The article is surrounded by a containment system for the treating fluid and the fluid is continuously agitated by an agitator.

Abstract: A method of lessening the tendency for carbon to deposit on a metal surface during thermal cracking of hydrocarbons which comprises isolating the metal surface with a glass-ceramic coating, and a coated furnace element for use in such method.

Abstract: A method of producing a sintered glass article from a fritted glass body, and preventing the body from adhering to a refractory carrier during the sintering step which comprises coating the refractory carrier with a thin, continuous layer of yttrium oxide.

Abstract: A runway for conveying glass tubing, as the tubing is drawn from a source of molten glass, embodies support assemblies having rotating sleeves mounted on guide shafts to contact the tubing. A circulating humid atmosphere is maintained in an enclosure during an initial portion of the tube draw to reduce frictive damage to the tubing.

Abstract: A method for polishing glass, ceramic, and glass-ceramic surfaces. The method includes exposing the surface to ultraviolet laser radiation under conditions effective to smooth the surface. Methods for polishing glass-ceramic surfaces containing spinel crystals using 193-351 nm radiation of a rare gas halide excimer laser operating at about 150 to about 400 mJ/cm.sup.2 are disclosed. Using the methods of the present invention, surfaces having an R.sub.a of about 4 to about 2 .ANG. are produced.

Abstract: A tubular, rigid, porous, ceramic separator for a rechargeable, deep-discharge battery assembly, the separator having a porosity greater than 40%. A plurality of battery cells, each embodying such separators, are assembled with a common terminal to form the positive electrode in a motive traction battery.

Abstract: The invention relates to the production of high purity fused silica glass which is highly resistant to 248 nm excimer laser-induced optical damage. In particular, this invention relates to a fused silica optical member or blank.

Abstract: A photochromic glass having colorant incorporated in the glass composition to impart a permanent tint, and having its chromaticity point shifted from the blue-green side toward the red side of the white point in the CIE chromaticity coordinate system, and a method of producing such article by heating the article for a sufficient time, and at a sufficient temperature, in a dilute, hydrogen-containing atmosphere to so move the chromaticity point.

Abstract: A battery assembly comprising a separator, spaced metal/metal oxide electrodes and a liquid electrolyte, the improvement comprising a rigid, porous, ceramic separator that is wettable by the liquid electrolyte, that has a porosity of 40-90 volume %, an average pore size in the range of 0.1-25 microns, a thickness of 1-12 mm, and a weight loss of not more than about 5% when exposed to H.sub.2 SO.sub.4 having a specific gravity of 1.28 for 72 hours at 70.degree. C.

Abstract: This invention is directed to the production of cuprous halide- or a cuprous-cadmium halide-containing glass articles which are essentially completely opaque to ultraviolet radiation and can be essentially completely opaque to radiation within the region of wavelengths of up to 550 nm, but are transparent to visible radiations having a wavelength longer than the radiation within the region of opacity. The method involves exposing the glass articles to a hydrogen gas-containing atmosphere at a temperature between about 375.degree.-500.degree. C. for a period of at least 18 hours to develop an integral reduced layer in at least one surface of the article having a depth effective to prevent the transmission of ultraviolet radiation and radiation having a wavelength up to 550 nm through the article.