Abstract:
A flame retardant epoxy molding compound comprises an epoxy, a hardener preferably of the novolac or anhydride type, a catalyst, a mold release agent, preferably a filler, preferably a colorant, preferably a coupling agent, an organic compound containing a halogen (which can be part of the resin or the hardener), and an oxidizing refractory metal oxide, preferably an oxidizing metal oxide of an element selected from the Group VIA of the Periodic Table. The flame retardant epoxy molding compounds when used to encapsulate semiconductor devices have synergistic flame retardant properties.
Abstract:
A method for making a substrate for use in a multilayered integrated circuit or multichip module which includes coating a conductive material (14) on a surface of a support sheet (10) to form a conductive circuit (12) and then drying the sheet. Next, a coating of a layer of dielectric layer (18) is placed on the support surface in the areas where the conductive material is not cast. After which the coated sheet is densified to form a densified conductive circuit embedded dielectric layer. A second coating of a dielectric (28) is placed over the first densified conductive circuit embedded dielectric layer such that the second layer is characterized by vias (30) therein which are in register with at least a portion of the conductive circuit (12). The vias in the second dielectric layer are filled to form electrically conductive vias and then densified to form the substrate (44).
Abstract:
Devices from and a method for generating repeatable and reproducible crystallographic grain-boundary junctions are provided by forming a film on a crystalline substrate which has intersecting faces. In a preferred embodiment, a single crystal substrate (10) is etched by an anisotropic etchant to provide a ''V''-groove in one face, and an epitaxial superconducting film (16) is grown on the faces (14) of the V-groove. In another preferred embodiment, a step is etched with an anisotropic etch, and an epitaxial superconducting film grown on the step. Grain-boundary junctions are formed at the points (20) of intersection of the faces with each other, or with the faces (18) and the surface of the substrate. The film may be patterned and etched in the area of the boundary junction to form useful devices. One useful device is a SQUID formed with the boundary junction at the bottom of a V-groove. Another useful device is serially connected junctions.
Abstract:
In situ vapor phase growth of thallium containing superconductors is achieved by controlling thallium volatility. Thallium volatility is controlled by providing active oxygen at the surface of the growing material and by avoiding collisions of energetic species with the growing material. In the preferred embodiment, a thallium containing superconductor is grown by laser ablation of a target, and by provision of oxygen during growth. More specificially, a source of thallium, calcium, barium, copper and oxygen is created by laser ablation of a thallium rich target (20), generating an ablation plume (36) that is directed onto a heated substrate (12) through the oxygen, with the plume passing through oxygen having a pressure from 10 to ten torr. Epitaxial superconducting thin films of thallium, calcium, barium, copper and oxygen have been grown by this technique. Various superconducting phases may be engineered through use of this method.
Abstract:
A process for producing conductor lines for electrical circuits, which process enables high packing density of the conductor lines and is adaptable to a large number of different conductors and support materials. The process comprises producing a powder image of a conductor line pattern by means of a preferably photographically prepared, positive, tacky pattern on an intermediate support; removing the tacky pattern, and transferring the powder image onto a final support, the powder image being consolidated into a conductor line pattern either before or after the transfer by sintering.
Abstract:
Microporous polytetrafluoroethylene (PTFE) articles (12, 14, 16), having a microstructure of nodes interconnected by fibrils also having continuous interporous metal coating which encapsulate the nodes and fibrils of the PTFE while maintaining substantial porosity, together with a method of producing temporary liquid filled hydrophilic microporous article resulting in an improved metal plating manufacturing process.
Abstract:
Methods and apparatus (48) for providing fine line, high density multiple layer printed circuit board packages (44). In the method for fabricating multiple layer printed circuit board package (44), a printed circuit board (42) is formed having a conductive circuit pattern (18) embedded in and integral with an insulator material substrate (32), such that the surface of the conductive circuit pattern is exposed along one surface (34) of the substrate, and lays flush and coplanar therewith. At least two of said boards (42) are stacked with a layer of insulator material (44) interposed between each pair of adjacent boards (42). The entire assembly is heat-pressed together to form a homogeneous block of insulator material having conductive circuit patterns embedded and integrally molded therein.
Abstract:
Normally solid copolymers of a fluorinated vinyl monomer and a perfluorinated vinyl compound having a carboxyl and/or sulfonyl group attached directly to the perfluorinated vinyl group or indirectly through an alkyl or ether linkage have been found to be soluble in low molecular weight polymers of perhalogenated alkyl ethers, low molecular weight polymers of perhalogenated alkyls and perfluoro kerosenes, each of said solvent materials having boiling points between about 200 C and 350 C. The copolymeric material dissolved in acordance with the instant invention can readily be resolidified by solvent removal and hydrolyzed or converted to the salt form to become a cation exchange material having an equivalent weight in the range of 1000 to 1600. Membrane coated cathodes can be formed using the dissolved copolymeric material and may be made by casting or coating a foraminous cathode followed by removal of the solvent to result in a continuous, pore-free coating of membrane on the cathode. Multiple coatings or other techniques can be used to build up the desired thickness of the membrane. Reinforced membrane may be produced by similar manufacturing techniques wherein the casting or coating of the membrane is upon a reinforcing backing fabric, which can be polytetrafluoroethylene mesh or the like is first wrapped around the foraminous cathode. The copolymeric material which is used in making the membrane coated cathode can be a single material or it can be of various equivalent weights, structures (carboxyl or sulfonyl, mixtures of same, or can be layers of the same or different materials).
Abstract:
A method of suppressing electrical breakdown on a surface of a substrate comprising the steps of applying a first coating layer (coating layer 2) on the surface of the substrate and applying at least one subsequent coating layer (coating layer 1) over the first coating layer.
Abstract:
The invention relates to the coating of flat glass with indium oxide. Indium oxide coatings, optionally doped, for example with tin, are produced in high yield by utilising a chemical vapour deposition process in which a gaseous mixture of an indium precursor compound and a source of oxygen is directed on to the hot glass surface; the indium precursor compound is preferably a dialkylindium compound (which may also be used without pre-mixing but with separate supply of the oxygen source to the glass surface). The processes of the invention are especially suitable for application of a doped indium oxide coating to a continuous ribbon of glass on the production line on which the glass is formed, for use, for example, in architectural glazing applications utilizing the low emissivity of the coating.