Abstract: The invention relates a method of manufacturing a semiconductor laser device having a coating on surfaces of a semiconductor body intended for emanation of a laser beam.

Abstract: A filament for an indirectly heated cathode is coated with a tungsten-aluminium oxide suspension, the tungsten particles being stabilized by a chemisorbed monomolecular layer of an aliphatic monocarboxylic acid such as stearic acid.

Abstract: The invention relates to a method of manufacturing a semiconductor device, in which methylated silyloxy groups are formed on a silicon oxide layer which protects a PN junction, the methylated silyloxy groups being formed to reduce the leakage current of the device.The method employs a solution in which an amine is present which is at least di-substituted.

Abstract: The invention relates to a semiconductor laser device having a coating on surfaces of a semiconductor body intended for emanation of a laser beam. For protection of these surfaces against attack during operation of the laser this coating comprises a layer of a compound having at least one alkyl group.

Abstract: A display cell having two parallel transparent substrate plates which are interconnected at their periphery and which are each provided with an electrode and an orientation layer, and comprising a liquid crystalline compound in the cell space between the plates, the orientation layer being a monolayer of an alkyl mercaptan.

Abstract: A method of providing a mould 1 (FIG. 1) with a release layer, in which a hydrophilic, inorganic surface 2, 4 of the mould is treated with a silane compound of the formula (R).sub.m --Si--(X).sub.4-m under anhydrous conditions.

Abstract: The magnetic head according to the invention has a magnetic core (1, 2) with pole tips (3, 4) which limit a gap (5) which is filled with a synthetic resin chosen from the group comprising epoxy resins, acrylic ester resins and polyester resins as a non-magnetizable material which adheres the pole tips to each other. The gap has a length of at most 0.5 .mu.m. A modifier may be used at the interfaces between the synthetic resin and the pole tips (3, 4) to further increase the tensile strength. The magnetic head is manufactured by applying to a moulding (1) of magnetizable material a solution of synthetic resin, by rotating the moulding about an axis at right angles to the coated surface and by placing a second moulding of magnetizable material (2) against it and curing the synthetic resin under pressure at an elevated temperature.

Abstract: A method of providing a metal mirror on an article of acrylate or methacrylate synthetic resin in which the surface to be metallized is treated with a solution of tannin in a mixture of water and an organic solvent and the treated surface is then provided with a metal mirror by using an electroless metallization process.

Abstract: In order to facilitate the release of polyurethane from a steel or aluminium mould, the metal surface is provided with a mono-layer of an alkylmercaptan. A silver layer may be provided between the mould metal and the alkylmercaptan monolayer.The invention can be advantageously used for manufacturing a luminaire for a tubular discharge lamp.

Abstract: A matrix having a surface which is manufactured from metal and which comprises a monolayer of an alkylmercaptan or a fluoroalkylmercaptan, as well as a method of manufacturing copies of synthetic resin from the matrix or copies comprising a coating layer of synthetic resin.

Abstract: A matrix having a surface of silica glass which is suitable for the manufacture of articles of synthetic resin in which the surface of the matrix comprises a monolayer of an aliphatic alcohol, as well as a method of manufacturing articles having a surface of synthetic resin while using the matrix.

Abstract: The invention relates to a method of photolithographically treating a substrate, in which a surface of the substrate is treated at least at the area at which it consists of an inorganic material with an organosilicon compound.In order to improve the adhesion of a photolacquer layer to be applied, the organosilicon compound used is a 3-aminopropyl-trialkoxysilane in the form of an aqueous solution.

Abstract: A method of providing a metal layer on a substrate having an ultra-smooth or microprofiled surface, in which the surface structure is reproduced in the metal layer. On the substrate surface which is hydrophilic or is made hydrophilic, preferably a monomolecular layer of alkoxysilylalkylthiol, an alkoxysilylalkylamine or a chlorosilylalkylthiol is provided as a bonding intermediary in a layer which is at most 15 molecules thick by contact with an atmosphere in which said substance is present in a vapor form. The metal layer is vapor-deposited thereon in a thickness of 50-300 nm.

Abstract: Optical recording element comprising a transparent supporting plate which on one side has successively a recording layer of preferably a ferrite, an optional transparent intermediate layer and a reflecting optical structure of reflection areas which are situated alternately at a high level and at a lower level and which can be read optically.

Abstract: Method of manufacturing an article of synthetic resin which has an electroless provided metal layer in which a mixture of monomeric acrylates and an N-substituted pyrrolidon compound is polymerized, the resulting article is treated with an aromic carboxylic acid substituted with one or more hydroxy groups and/or an amino group, or derivatives thereof, and a metal layer is then provided on the thus treated article by electroless deposition.

Abstract: Etching indium patterns on insulating supports with the use of an etchant-resistant mask, by means of a solution of an acid to which ferric chloride has been added. Passivation of the bath is prevented by adding ferric chloride.