Abstract: A magnetic recording medium comprises a substrate coated with a magnetic composition comprising a magnetic powder in a binder comprising a vinyl chloride-vinyl acetate vinyl alcohol copolymer having more than 10 wt. % of vinyl alcohol component and a vinyl chloride polymer-impregnated nitrocellulose which is crosslinked with a polyisocyanate.

Abstract: A system for testing magnetic tape comprising a pair of magnetic head assemblies positioned at a fixed length along the path of magnetic recording tape. A read-out signal of the first magnetic head is delayed by a delay circuit by time t=l/V, where l is the length between the first magnetic head and the second magnetic head, and V is the tape feeding speed. A logical AND circuit and a logical exclusive-OR circuit are provided for receiving the output of the delay circuit and the read-out signal of the second magnetic head. When the AND circuit provides an output signal, it is recognized that both the first and second magnetic heads have sensed a permanent defect. When the exclusive-OR circuit provides an output signal, it is recognized that either the first magnetic head or second magnetic head has sensed a temporary defect. Accordingly, both a permanent defect and a temporary defect are detected by running magnetic tape only once in a predetermined direction.

Abstract: A hydrated iron oxide comprising a silicon component and a phosphorus component is produced by adding a silicate and a phosphate in an aqueous solution of a base and mixing it with an aqueous solution of a ferrous if necessary with a small amount of zinc ion and oxidizing it under controlling pH in a range of 5.5 to 7.5.

Abstract: A magnetic iron oxide powder having high coercive force is produced by dispersing a magnetic iron oxide comprising a silicon component and a phosphorus component in an aqueous solution of a cobalt ion and adding a base to the dispersion to be an alkaline condition and heat-treating the dispersion whereby the cobalt ion is adsorbed and diffused in the surface layer of the magnetic iron oxide. A zinc component can be also incorporated in the crystal. The silicon component and the phosphorus component are preferably incorporated in the crystalline structure.

Abstract: A magnetic powder for a magnetic recording medium is obtained by forming a silica layer on a surface of an acicular iron oxide fine powder as a core by treating it with a silicon compound before preparing a cobalt modified acicular iron oxide fine powder by dispersing said acicular iron oxide fine powder as the core in an aqueous solution of ammonia containing cobalt ion and treating it in an inert gas atmosphere at high temperature or in a reduction atmosphere.

Abstract: A voltage non-linear resistor comprises a sintered body of a ceramic composition comprising zinc oxide at a ratio of 99.88 to 84.88 mol % as ZnO; a praseodymium oxide component at a ratio of 0.01 to 0.035 mol % as Pr.sub.2 O.sub.3 and a lanthanum oxide component at a ratio of 0.01 to 0.035 mol % as La.sub.2 O.sub.3 and a cobalt oxide component at a ratio of 0.1 to 15 mol % as CoO and a specific additional component selected from chromium oxide, boron oxide, silicon oxide, titanium oxide, tin oxide, zirconium oxide, niobium oxide, tantalum oxide, tungsten oxide and germanium oxide at a ratio of 0.0001 to 0.05 mol %.

Abstract: A master magnetic recording medium comprises a polymer film substrate coated with a magnetic layer comprising a binder, a metallic magnetic powder A obtained by a wet reduction and a metallic magnetic powder B obtained by a dry reduction wherein both said magnetic powders A and B have each coercive force of 1800 Oe or higher and each saturated magnetization .sigma.s of 130 emu/g. or higher and a ratio of said magnetic powder A to said magnetic powder B is in a range of 0.1 to 10 by weight.

Abstract: Ferromagnetic metal particles of high quality are produced by a process which comprises heat-treating starting material particles selected from the group consisting of the particles of ferromagnetic metals, ferromagnetic alloys, and oxides and hydroxides of ferromagnetic metals, in a reducing atmosphere at a temperature required for converting the material particles into ferromagnetic metal particles of improved magnetic properties. Electrostatic charges are imparted to the material particles during the heat treatment, whereby aggregation of material particles is hindered during the treatment.

Abstract: Voltage or current or power supplied to the piezo-electric vibrator of an ultrasonic nebulizer is sensed and used as negative feedback to stabilize oscillation in the oscillator driving circuit.

Abstract: A novel non-linear resistance element or varistor element is provided by the invention. The body of the element is a ceramic sintered body mainly composed of titanium dioxide admixed with small amounts of oxides of niobium, tantalum and/or antimony and electrodes are provided with a metallic material. Different from the conventional varistor elements, the electrode is bonded to the sintered body with ohmic contact by the techniques of flame spraying or electroless plating depending on the kind of the metallic material for the electrode selected from silver, aluminum, nickel and the like. Further improvement is proposed to increase the bonding strength of lead wires on to the electrodes by soldering as accomplished by providing a layer of a material having good solder-receptivity on the electrode which also serves for preventing the oxidation of the electrode material.

Abstract: A magnetic recording medium comprises a substrate coated with a magnetic layer comprising a magnetic powder and a binder and a rust inhibitor at a ratio of more than 0.1 wt. % based on resins of the binder.

Abstract: An inductance device comprises a drum core on which a coil is wound and which has a projection; a rectangular pot core having each concave part on the upper surface and the lower surface and having a hollow for fitting said drum core and a hole for fitting said projection of said drum core; electrode parts which are respectively formed on each side surface and said concave part of the upper surface of said pot core and on the bottom surface of said pot core; said drum core having said coil being fitted into said hollow of said pot core; and said coil being connected to said electrode parts at said concave part by each of lead terminals of said coil; and said drum core being sealed in said hollow.

Abstract: An electrode for electrolysis comprises a conductive substrate which is coated with a combination of palladium oxide and platinum metal or a combination of palladium oxide and Pt-Pd alloy which comprises 99 to 5 mole % of palladium component as Pd and 1 to 95 mole % of platinum component as Pt and at least 25 wt. % of palladium component being in a form of palladium oxide.

Abstract: In a process for producing an iron oxide having magnetite as a main component by heating to reduce a powder of an iron oxide or a hydrated iron oxide in an atmosphere for reduction, an improvement characterized in that said atmosphere for reduction comprises an inert gas, steam and a gas of an organic compound for reducing an iron oxide.

Abstract: A chip capacitor which has a substantially rectangular dielectric body having a pair of long sides, a pair of short sides perpendicular to said long sides, a pair of conductive confronting electrodes attached on the surface of the dielectric body so that the electrodes sandwich the dielectric body, a pair of terminals each provided along the related short side of the dielectric body and being electrically connected to the related electrode, and the junction point of each long side and each short side of the dielectric body is recessed. Preferably, the dielectric body is tapered towards the short sides.

Abstract: An SiO.sub.2 coated iron oxide powder used for the preparation of an acicular metallic iron powder or an acicular magnetic iron oxide powder, is produced by forming a slurry of hydrated iron oxide as a starting material or a iron oxide powder having pH of 8 to 14; admixing a water soluble silicate at a ratio of 0.1 to 10 mol % as SiO.sub.2 based on Fe; hydrothermally reacting said mixed slurry at 100.degree. to 250.degree. C. for 5 minutes or longer in a closed reactor, and washing, filtering and drying the product.