Abstract: A gas sensor offering high gas identification property includes: a first gas detection element having a first oscillator, as well as a first gas-adsorption film which is provided on the first oscillator and constituted by two or more fluorine resins including vinylidene fluoride resin; a second gas detection element having a second oscillator, as well as a second gas-adsorption film which is provided on the second oscillator and constituted by two or more fluorine resins including vinylidene fluoride resin and which has adsorption characteristics different from those of the first adsorption film; and a detection circuitry that detects the resonance frequencies of the first and second gas detection elements.

Abstract: A high dielectric composition for particle formation that includes a high dielectric solvent, and a high dielectric polymer dissolved into the high dielectric solvent. A method of forming particles including dissolving a high dielectric polymer in a high dielectric solvent to form a high dielectric composition, and dielectrophoretically spinning the high dielectric composition in an electrostatic field to form particles.

Abstract: A high dielectric contrast composition for particle formation that includes a high dielectric solvent, and a polymer dissolved into the high dielectric solvent. A method of forming particles including dissolving a polymer in a high dielectric solvent to form a high dielectric composition, and dielectrophoretically spinning the high dielectric composition in an electric field to form particles.

Abstract: A method for providing a perpendicular magnetic recording head includes providing a metal underlayer and forming a trench in the metal underlayer. The trench has a bottom and a top wider than the bottom. The method also includes providing a PMR pole. At least a portion of the PMR pole resides in the trench. The method also includes providing a write gap on the PMR pole and providing a top shield on at least the write gap.

Abstract: A method of manufacturing a thin film magnetic head in which a top pole is divided into a pole tip and a tope pole layer, and the pole tip is formed on the flat surface of a bottom pole with a write gap layer in between. An insulating layer is formed in a region adjacent to the pole tip. A first layer of thin film coil is formed in a region wherein the insulating layer is formed. The thin film coil is covered by the insulating layer whose surface is flattened. A surface of the top pole layer facing the recording medium can be formed recessed from a surface of the pole tip facing the recording medium.

Abstract: A metallized film capacitor is provided with a polyurethane oil insulating fluid. The insulating fluid has a viscosity in the range of about 500 to 3000 poise at 25.degree. C. The polyurethane oil insulating fluid is produced by reacting an organic polyisocyanate with a primary polyol selected from the group consisting of castor oil, ricinoleic acid derivatives of castor oil and mixtures thereof. The reaction may be carried out in the presence of a secondary polyol chain extender such as a hydroxy-terminated polybutadiene diol. The reaction to produce the insulating fluid is carried out under conditions wherein the ratio of NCO groups of the organic polyisocyanate to OH groups of the primary and secondary polyols, if present, is in the range of about 0.1 to 1 to about 0.6 to 1. The ratio ensures that there is no excess of unreacted NCO groups in the insulating fluid and that the reaction produces a viscous fluid, not a substantially solid elastomer.

Abstract: Sheet capacitive materials for use in forming a thin-film capacitor comprise an electrically nonconductive substrate, a layer of electrically conductive material disposed a surface of the substrate, and a layer of electrically nonconductive material disposed onto a surface of the conductive material layer. The conductive material layer includes a contact area along a first lengthwise edge of the substrate that is thicker than remaining portions of the material layer. A portion of the substrate adjacent a second lengthwise edge remains exposed. The electrically nonconductive material includes an anti-stick component, and covers the exposed substrate surface and a major portion of the material layer except for the contact area. A first and second sheet is constructed having contact areas along opposite lengthwise edges. The sheets are placed together so that the contact areas are oriented at opposite lengthwise edges, and are staggered so that the contact areas remain exposed.

Abstract: A dielectric liquid is provided comprising (a) a fluorinated, inert liquid, or a mixture of fluorinated, inert liquids and (b) a fluorine-containing, nonionic sulfonate ester or sulfonamide, such that the dielectric liquid has a dielectric constant intermediate or between that of component (a) and component (b) and the dielectric constant represents the relative amounts of the relatively lower dielectric constant of the fluorinated, inert liquid per se and the relatively higher dielectric constant of the sulfonate ester or sulfonamide per se and components (a) and (b) of the dielectric liquid are miscible with one another over the operating temperature range of the electrical device employing the dielectric liquid.

Abstract: Polymeric dielectrics, which comprise 60 to 79 % by mole of repeating units derived from vinylidene fluoride, 18 to 22 % by mole of repeating units derived from trifluoroethylene and 3 to 22 % by mole of repeating units derived from chlorotrifluoroethylene, have high dielectric constant.

Abstract: An electrical insulating oil composition which comprises 45% by weight or more of at least 2 members selected from the group consisting of (a) m-ethylbiphenyl, (b) p-ethylbiphenyl, (c) o-benzyltoluene, (d) m-benzyltoluene, (e) p-benzyltoluene, and (f) 1,1-diphenylethane; and the remainder of non-condensed bicyclic aromatic hydrocarbons having not more than 17 carbon atoms besides the above 6 components; and is characterized in that, when the temperature of the composition is -40.degree. C., (I) the total quantity of solid phase obtained by calculating according to the following solid-liquid equilibrium equation is 45% by weight or less relative to the total quantity of the composition, and (II) in the liquid phase composition calculated by the following solid-liquid equilibrium equation, the total quantity of the compounds (a) to (f) is 40% by weight or more and the viscosity of this liquid phase is 500 cSt or lower, ##EQU1## wherein X.sub.

Abstract: A printed circuit board material composed of a reinforcing base material and a cured or uncured resin is disclosed, in which the base material is a fabric woven from hybrid yarns each of which is prepared from (I-1) at least one multifilament yarn made of glass fiber having a dielectric constant at 1 MHz of not higher than 5.5 or (I-2) at least one multifilament yarn made of heat resistant engineering plastic fiber having a dielectric constant at 1 MHz of not higher than 5.5 and (II) at least one yarn made of fluoroplastic long fiber and the thermosetting resin is a thermosetting resin whose dielectric constant after curing is not higher than 3.7. The material is excellent in dielectric properties and characteristics required for use in printed circuit board, such as heat resistance in soldering, flexural strength and peel strength of copper foil.

Abstract: A dielectric medium composition comprising a fluorine-containing amide or a fluorine-containing sulfonamide and capacitors or other electric devices incorporating said composition, are disclosed herein.

Abstract: A mounting for integrated circuit chips or solid state gas sensors, with superior thermal and electrical insulative properties. The mounting incorporates a tiny thin-wall glass capillary tube as the pedestal on which the chip or sensor is mounted. The glass tube holding the chip or sensor is then mounted on any base. A high temperature ceramic adhesive is used to hold the structure together. This method gives good mechanical support to the chip or sensor while reducing the amount of heat lost to the support structure. By using this technique, the amount of power required to heat the device to elevated temperature is vastly reduced.

Abstract: The dielectric polymer materials are composed of about 25 to 90 mol % of vinylidene fluoride, about 5 to 70 mol % of ethylene trifluoride, and about 1 to 13 mol % of ethylene chloride trifluoride. The dielectric polymer materials possess a high dielectric constant and do not vary in dielectric constants with temperatures.

Abstract: The gas absorption ability of a phthalate ester is improved by the addition of an alkylated benzene with 18 carbons outside the benzene ring. This also improves the swellability of polypropylene film capacitors.

Abstract: A novel electrical insulating oil and oil-filled electrical appliances that are impregnated with the novel insulating oil. The electrical insulating oil is quite suitable for use in oil-filled electrical appliances in which insulating materials or dielectric materials made of plastics are employed. The electrical insulating oil comprises (a) at least one member of alkylbiphenyls and alkylnaphthalenes and (b) at least one member of monoolefins and diolefins each having two condensed or noncondensed aromatic nuclei.

Abstract: An improved electrical insulating oil and oil-filled electrical appliances impregnated therewith. The electrical insulating oil is quite suitable for use in oil-filled electrical appliances in which insulating materials or dielectric materials made of plastics are employed. The electrical insulating oil comprises (a) at least one member of diarylalkanes and (b) at least one member selected from the group of mono- and/or diolefins having two condensed or noncondensed aromatic nuclei.

Abstract: There is disclosed a fluid comprising a mixture of about 5 percent to about 40 percent by volume of a halogenated benzene and about 60 percent to about 95 percent by volume of an alkyl branched chain phthalate ester, said fluid having a dielectric constant greater than the dielectric constant of either of the halogenated benzene or the alkyl branched chain phthalate ester. The dielectric constant of an alkyl branched chain phthalate ester having a dielectric constant above about 4.0 is increased by mixing a halogenated benzene having a dielectric constant above about 4.0 with the alkyl branched chain phthalate ester whereby the measured dielectric constant of the alkyl branched chain phthalate ester having the halogenated benzene therein, is at least 0.25 higher than the dielectric constant of either the halogenated benzene or the alkyl branched chain phthalate ester. The preferred halogenated benzene is trichlorobenzene, and the preferred alkyl branched chain phthalate ester is di-2-ethylhexylphthalate.

Abstract: New compounds of the formula: ##STR1## where n, x, y and z have value 1 or 2, their process of preparation and their use as dielectrics such as insulating fluids for transformers alone or in mixture with one or more products of general formula: ##STR2## where a varies from 2 to 4, b varies from 0 to 2 and R is an aliphatic hydrocarbon radical containing from 1 to 3 carbon atoms.

Abstract: An improvement in an electrical device containing a functional liquid wherein the functional liquid is a compound of the formula ##STR1## and the use of such compounds as dielectrics.

Abstract: In an electrical device containing a dielectric fluid, the improvement comprising employing as the dielectric fluid a compound of the formula: ##STR1## where X is independently --Cl or --Br; Z is independently ##STR2## R and R' are independently (CH.sub.2).sub.n CH.sub.3 ; and n is an integer of 0 to 10.

Abstract: Liquid, non-flammable dielectric compositions especially adapted as insulators/coolants for transformers are comprised of [1] a mixture of polychlorobenzenes, including a major amount of an at least trichlorinated benzene and a minor amount of ortho-dichlorobenzene, and [2] an alkylaromatic hydrocarbon or a partially hydrogenated bi- or terphenyl.

Abstract: A dielectric composition containing a major amount of a bis (C.sub.6-12 alkyl) phthalate such as diisononyl phthalate, a minor amount of butylated monochloro diphenyl oxide, and a small effective amount of an epoxy stabilizer, and an electrical device such as a capacitor comprising metal foil electrodes separated by paper sheet and/or plastic film impregnated with said composition.

Abstract: An electrical capacitor having an improved dielectric system. The capacitor includes alternate layers of metal foil and polymeric dielectric film which is impregnated with a liquid dielectric composition composed of a mixture of mono-halogenated diphenyl oxide and a mono-halogenated alkyl diphenyl oxide where the alkyl group contains from 1 to 20 carbon atoms in the molecule. In processing the capacitor, the capacitor casing is vacuum dried at room temperature and the dielectric liquid is separately agitated under vacuum to remove gas from the liquid. The degassified liquid is introduced into the casing and the liquid is subjected to a vacuum while maintaining the capacitor at room temperature to impregnate the polymeric layers with the liquid. The capacitor has improved corona characteristics and low dielectric losses, and the liquid dielectric composition is substantially biodegradable.

Abstract: An electrical apparatus, such as a capacitor, having an improved dielectric system. The capacitor includes alternate layers of metal foil and a dielectric material comprising polymeric film, or a combination of polymeric film and paper, which is impregnated with a liquid dielectric composition composed of a mixture of mono-halogenated diphenyl oxide and a mono-halogenated alkyl diphenyl oxide where the alkyl group contains from 1 to 20 carbon atoms in the molecule. The capacitor has improved corona characteristics and low dielectric losses, and the liquid dielectric composition is substantially biodegradable.