Abstract: Rib structures for containing plasma in electronic displays are formed by redrawing glass preform into fiber-like rib components. The rib components are then assembled to form rib/channel structures suitable for use in flat panel displays, such as plasma emissive displays, field emissive displays and plasma addressed liquid crystal displays.

Abstract: A glass ceramic or glass-ceramic sheet is formed by progressively reducing the thickness of the sheet by passing the sheet between successive pairs of counter-rotating rollers. The average viscosity of the sheet is maintained between 5.times.10.sup.4 and 10.sup.9 P during the sheet forming operation.

Abstract: An adjustable stand is disclosed for raising and lowering a cantilevered load while reducing friction and preventing binding in the raising and lowering mechanism. A carriage for a cantilever arm, carrying the cantilevered load, rolls along a pair of parallel linear shafts by means of ball bearing bushings thus providing linear non-binding rolling motion therealong. In addition, an air clamp is provided for lockably positioning the cantilevered load in a desired rotational orientation with respect to the cantilever arm.

Abstract: The invention relates to photochromic transparent organic materials particularly useful for the production of photochromic organic ophthalmic lenses. The material includes an optical-quality polymer matrix and at least one coloring agent giving photochromic properties to the matrix. The coloring agent is chosen from the group of the spirooxazins the spiropyrans, and the chromenes. The polymer of the matrix is chosen from the group of homopolymers of ethyoxylated bisphenol A dimethacrylate with formula I: ##STR1## in which R is H or CH.sub.3, and m and n independently represent 1 or 2, and of the copolymers of this dimethacrylate containing at most 30 wt % of an aromatic monomer with vinyl, acrylic or methacrylic functionality.

Abstract: A method for making color filters for liquid crystal display panels. A raised pattern corresponding to the desired black matrix pattern is formed on a substrate, e.g., by an embossing means. A plurality of colored ink patterns is formed in the appropriate location within the boundaries formed by the raised pattern, thereby forming the multicolor image that will become the color filter.

Abstract: Fused silica boules (19) having improved off-axis homogeneity are produced by controlling the air flow around the boule (19) during its formation. The boule is formed in a containment vessel (13) which collects soot from a plurality of burners (14). The containment vessel (13) rotates and oscillates relative to the burners (14) as the boule (19) is formed. Surrounding the containment vessel (13) is an air flow wall (130) which oscillates with the containment vessel (13). The air flow wall (130) is spaced from the containment vessel (13) by a gap (175) through which air flows during boule formation. The dimensions of this gap (175) remain constant as the boule is formed. Surrounding the air flow wall (130) is a stationary wall (160). The stationary wall (160) is spaced from the air flow wall (130) by a gap (165) whose dimensions change as the boule is formed. A motion accommodating seal (155) blocks air flow in this gap (165).

Abstract: The invention relates to glasses which absorb UV radiation and which have the following composition, in wt. %: SiO.sub.2 30-52; ZnO 0-8; B.sub.2 O.sub.3 12-22; PbO 0-2; ZrO.sub.2 5-14; Y.sub.2 O.sub.3 0-15; Al.sub.2 O.sub.3 0-12; La.sub.2 O.sub.3 5-25; Li.sub.2 O 1.5-3.5; TiO.sub.2 0-2; Na.sub.2 O 0-6; HfO.sub.2 0-2; K.sub.2 O 2-9; Nb.sub.2 O.sub.5 0-2; MgO 0-5; Ta.sub.2 O.sub.5 0-2; CaO 0-5; MoO.sub.3 0-2; SrO 0-9; WO.sub.3 0-2; BaO 0-14; SnO 0-4; Sb.sub.2 O.sub.3 0-4; SnO.sub.2 0-4; AS.sub.2 O.sub.3 0-4; CdO 0-1; CuO 0.15-1; F 0-2; Cl 0-3; Br 0-3; I 0-2 with the following conditions: Li.sub.2 O+Na.sub.2 O+K.sub.2 O (X.sub.2 O) 7-14; MgO+CaO+SrO+BaO (XO) 12-20; ZrO.sub.2 +Al.sub.2 O.sub.3 <15; F+Cl+Br+I 0.2-4.0; TiO.sub.2 +PbO+Nb.sub.2 O.sub.5 .ltoreq.2; AS.sub.2 O.sub.3 +Sb.sub.2 O.sub.3 +SnO.sub.2 +SnO 0.05-4.0 and a ratio R=(M.sub.2 O+2MO-Al.sub.2 O.sub.3 -ZrO.sub.2)/B.sub.2 O.sub.3 where M.sub.

Abstract: The invention relates to a glass-ceramic cooking plate for gas cooking apparatuses, characterized by the fact that it has at least one opening 2 intended to receive a gas burner 3 and several humps 5 of the same height distributed around this opening which are intended to support a cooking utensil which is to be heated by said burner, said humps being an integral part of the plate itself.

Abstract: An optical device capable of absorbing ultraviolet radiation while providing high transmission throughout the visible wavelength region. The device which combines UV blocking glass and solarization resistant glass is resistant to solarization when exposed to intense UV emissions; and at the same time, sharply cutting-off transmission at about 400 nm.

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: The present invention has for subjects, novel benzopyran derivatives, substituted in position 2 with an adamantyl group as well as the compositions and (co)polymer matrices containing such derivatives. Said derivatives possess interesting photochromic properties.

Abstract: The present invention is directed towards a lightweight, sealant-free, thin glass envelope having a front surface and back surface laminated and integrated together, i e. specifically, a unitary envelope body having at least one discharge or ionizable gas channel. The glass envelope exhibits a weight to area ratio of .ltoreq.1.0 g/cm.sup.2. Lightweight, internally channeled light-emitting devices can be formed from these thin glass envelopes by etching electrodes to the envelope, at opposite ends of, and in communication with, the gas channel which contains a discharge or ionizable gas.

Abstract: A system and method for measuring a level of optical distortion in a transparent material in accordance with the present invention includes an image capturing device, a section with a pattern of substantially uniform features, and a processing system which operates on software programmed in a memory in the processing system.

Abstract: The invention relates to organic photochromic materials consisting of a polymer matrix of optical quality and of at least one dye that imparts photochromic properties to the matrix, the dye being selected from spirooxazines, spiropyrans and chromenes. The polymer constituting the matrix is a copolymer of 30-95 wt % ethoxylated bisphenol A dimethacrylate and 5-70 wt % of a polyurethane oligomer having terminal di- or triacrylic or di- or trimethacrylic functionality. Such photochromic materials are most suitable for the production of ophthalmic and sun protection lenses.

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 device for shaping rods, in particular, of a glassy material, by casting said material in a molten state in a mold, characterized by the fact that said mold comprises a) a cylindrical internal wall of a porous material and b) a means to inject a gas in this wall and cause it to come out of the wall on the side facing the glassy material accumulated in the mold, so as to constitute an interstitial flow of a film of gas that separates the glassy material from the inside wall of the mold.

Abstract: The invention relates to the production of high purity fused silica glass which is highly resistant to optical damage by ultraviolet radiation in the laser wavelength of about 300 nm or shorter. In particular, this invention relates to a fused silica optical member or blank which exhibits substantially no optical damage up to 10.sup.7 pulses (350 mJ/cm.sup.2) at the KrF laser wavelength region of about 248 nm, and at the ArF laser wavelength region of about 193 nm.

Abstract: The invention relates to an extruded honeycomb structure in which every cross-section is rotationally displaced from other cross-sections. The cells are twisted and as a result, are not parallel with the axis of extrusion. The twisted cells are formed by passing plastically deformable material through a die and twisting or rotationally displacing the extrudate around its central axis to obtain a twisted honeycomb structure.

Abstract: This invention is directed to the production of glass articles transparent to visible radiation, but opaque to ultraviolet radiation, rendering them particularly suitable for protecting the wearer of such lenses from exposure to laser radiation in the ultraviolet regions of the electromagnetic spectrum. The method involves exposing silver halide-containing glass articles to flowing hydrogen in a heat chamber operating at 375.degree.-500.degree. C. for at least four hours to produce an integral reduced layer in at least one surface of the articles of sufficient depth to prevent the transmission of ultraviolet radiation through the articles.

Abstract: High purity fused silica glass which is highly resistant to optical damage by ultraviolet radiation in the laser wavelength of about 300 nm or shorter is produced. In particular, a fused silica optical member or blank exhibits substantially no optical damage up to 10.sup.7 pulses (350 mJ/cm.sup.2) at the KrF laser wavelength region of about 248 nm, and at the ArF laser wavelength region of about 193 nm.