Abstract: An improved metal coating for a video disc of a grooved polymer disc, a conductive metal coating thereon and a dielectric coating on said metal coating, wherein said metal coating comprises a film of a pseudoalloy composition of an alloy of nickel and chromium and, optionally, iron, containing from about 10 to about 25 atomic percent of oxygen admixed with from about 10 to 15 atomic percent of copper.

Abstract: The addition of certain nitrobenzene compounds to liquid crystal compositions having positive dielectric anisotropy, lowers the threshold voltage of electro-optic cells including such compositions. The nitrobenzene compounds have the formula ##STR1## wherein R is an alkyl group of 1-20 carbon atoms, X.sub.1 and X.sub.3 can be hydrogen or nitro and X.sub.2 can be hydrogen, --NO.sub.2, ##STR2## or--O--CH.sub.2 CN, with the proviso that at least one of X.sub.1, X.sub.2 or X.sub.3 is a radical other than hydrogen.

Abstract: A single crystal of lithium tantalate is pretreated to diffuse lithium atoms into the crystal. Niobium is then diffused into the pretreated crystal to form an optical waveguide.

Abstract: Liquid crystal cells containing mixtures of cholesteric optically active p-alkoxybenzylidene-p'-aminobenzonitrile compounds with nematic liquid crystal compounds form cholesteric liquid crystals which change to the nematic stage upon application of an electric field. Electro-optic devices including such liquid crystals have low voltage requirements and rapid response times.

Abstract: A D.C. glow discharge is applied to a heated glass substrate coated with a conductive layer in the form of a pattern in an evacuated chamber, to which chamber certain amounts of oxygen and a volatile tin composition have been added. A glass substrate is produced which is coated with a patterned, transparent, conductive coating of tin oxide, wherein the surface region of the glass has been depleted of alkali metal ions.

Abstract: Applying a D. C. glow discharge to a heated glass substrate in an evacuated chamber to which certain amounts of oxygen and a volatile tin composition have been added, produces a glass substrate coated with a transparent, conductive coating of tin oxide wherein the surface region of the glass beneath the coating has been depleted of alkali metal ions.

Abstract: The addition of copper, either as a thin film or as an alloy constituent, to nickel-chromium alloys improves the adhesion of such alloys to polymeric substrates and coatings.

Abstract: An improved metal coating for a video disc of a grooved polymer disc, a conductive metal coating thereon and a dielectric coating on said metal coating comprising a trilayer film of a first layer of copper about 25-50 angstroms thick, a second layer about 200 angstroms thick of an alloy of nickel, and chromium and, optionally, iron, containing from about 20 to about 30 atomic percent of oxygen, and a third layer, of copper, about 25-50 angstroms thick.

Abstract: The inner surfaces of a pair of substrates of a liquid crystal display are treated with a solution of a surfactant to provide a uniform stable alignment of the liquid crystal material confined between the inner surfaces. The inner surfaces are first wetted by the soluton of the surfactant, a silane derivative, and the solution is then heated, while the inner surfaces are in contact with the solution, to a temperature between about 75.degree.C and a temperature just below the boiling point of the solution.

Abstract: For the purpose of controlling the alignment of the molecules of a liquid crystal material, one or more inside surfaces of the device enclosure is coated with successive slant evaporated layers. In one embodiment, the first or bottom layer is deposited at a comparatively high angle of deposition relative to the substrate surface, and the second or covering layer is deposited at a comparatively low deposition angle and at right angles to the direction of deposition of the first layer. In another embodiment, the two layers are interchanged. In both embodiments, the upper layer is extremely thin in comparison with the bottom layer.

Abstract: Copolymers of certain keto-olefins and SO.sub.2 are sensitive to light and form films useful as photoresists in the manufacture of printed circuits, integrated circuits, printing plates and the like.

Abstract: A method of making a disc record molding composition by compounding a copolymer of vinyl chloride-vinyl acetate and a homopolymer of vinyl chloride, with carbon black, a resin stabilizer, a resin plasticizer, an antistatic agent and a mold release agent in a series of blending steps which include successive increases in temperature, that results in a product capable of taking an unusually high signal density per unit of groove wall area.

Abstract: The development of an exposed electron beam sensitive resist film in a two-stage process, rather than in a single stage, with a water wash between stages, improves the sensitivity and resolution that can be achieved for the resist.

Abstract: Liquid crystal compositions compositions and liquid crystal thermometric articles, radiation sensors, and optical display devices comprised of a nematic liquid crystal solvent which is effectively transparent to radiation of near ultraviolet and visible wavelengths and a fluorescent solute whose visible fluorescent intensity varies with the phase or orientation of the liquid crystal solvent are disclosed.

Abstract: In a cell comprising a pair of oppositely disposed, flat substrates, and an edge seal maintaining the substrates in spaced apart relation, a fabrication process in which the two substrates are disposed in oppositely disposed relation and in contact with a glass frit bead disposed therebetween, and spacer plates are disposed between the substrates between the bead and the edges of the substrates. The glass bead is heat softened and the two substates forced towards one another against the bead until further inward movement is prevented by contact of the substrates with the spacer plates.

Abstract: The effective sensitivity of a photo- or electron beam resist is improved by contacting the resist film with developer solution and water prior to exposure.

Abstract: A body of lithium niobate coated with a first thin layer of magnesium and a second conductive metal layer on the magnesium layer permits subsequent ultrasonic bonding of a wire to the second layer without problems of delamination.

Abstract: Certain light sensitive .alpha.-diketones dissolved in a cured light-insensitive transparent polymer host form recording media useful for recording volume phase holograms.

Abstract: Nematic liquid crystal compounds of the formula: ##SPC1##Wherein X can be hydrogen, alkyl (R-), alkoxy (RO-), acyloxy ##EQU1## or alkylcarbonato ##EQU2## wherein R is an alkyl group of 1-10 carbon atoms, have positive dielectric anisotropy and are useful in electro-optic cells which comprise a thin liquid crystal layer between two closely spaced parallel electrodes.

Abstract: Recording media comprising a mixture of 2,4-bis(6-diazo-5,6-dihydro-5-oxo-1-napthalenesulfonyloxy)-benzophenone and an alkaki soluble resin are suitable for recording information with electron beams. These recording media have high sensitivity, high resolving power and can be reproducibly formulated.