Abstract: A protective jacket for rotatably holding a plane disc magnetic recording medium between buffer sheets bonded on the inner surfaces of a body of the protective jacket in vortex or annular form around a rotary axis of the plane disc magnetic recording medium.

Abstract: A reel for a tape cassette comprises reinforcing ribs connected, in the radial direction, with an inner peripheral surface of a magnetic tape winding core which is coaxially placed to the rotary axis. The magnetic tape winding core is formed by an inner tubular wall which is connected with the reinforcing ribs and an outer cylindrical or tubular wall which is coaxially connected with the inner tubular wall with a gap.

Abstract: A magnetic tape cassette in which a cassette housing has half cases with aligned, confronting projections on innder surfaces thereof on which a cylindrical guide roll with an axial bore therethrough is supported, has an annular, axially projecting rib on either the guide rolls or the projections so as to prevent any burrs which may be on the guide roll around the axial bore therethrough from coming into contact with the projections, thereby preventing noise which might otherwise be caused by the burrs.

Abstract: An alkali hydroxide is added to an aqueous solution of ferrous salt to form a precipitate and a part of the solution is separated to control a ratio of an anion to a ferrous component to less than 1 and the ferrous component is oxidized to acicular goethite with an alkali metal chlorate such as potassium chlorate.

Abstract: A sintered body of a ceramic composition for voltage non-linear resistor is produced by sintering an oxide semiconductor composition comprising a main component of zinc oxide and a minor component at 1100.degree. to 1400.degree. C.; then maintaining the sintered body in an inert gas such as N.sub.2, Ar and so on having an oxygen content of 0.1 to 21 vol. % at the temperature lower than the sintering temperature for a specific time; changing the atmosphere into an inert gas having an oxygen content of lower than 0.02 vol. % at 800.degree. to 1200.degree. C.; and cooling it.

Abstract: An insoluble electrode for electrolysis is prepared by coating a solution or slurry comprising palladium oxide and a platinum compound which can be thermally decomposed to form platinum metal, and optionally another salt or oxide, on a conductive substrate and drying it and baking it at elevated temperature.

Abstract: A magnetic powder is prepared by dispersing iron oxide or iron oxide hydrate which can be coated or doped with at least one of cobalt, nickel, tin, titanium, bismuth, zinc or antimony or its compound, as the starting material into an aqueous solution of a water soluble resin and separating the powder and heating it in a reducing atmosphere to reduce it.

Abstract: A color image pickup system for a color television system comprises a single image pickup device, a color filter mounted in front of the screen of said image pickup device, said color filter having an array of the repetition of a pair of horizontal colored belts or scanning lines, the first scanning line having an arrangement of cells of the three elementary colors, the second scanning line having an arrangement of the complementary elementary colors to those of the first scanning line. Thus, the colors of each pair of cells in the vertical direction of the two scanning lines are complementary. The output of the image pickup device is processed by adding the signals of the first scanning line and the second scanning line for every vertical cell to provide a brightness signal(Y). As a color signal, only the first scanning line is selected and a pair of color cells (red and blue) are sampled.

Abstract: Disclosed herein is a heating element for an air heater and the like comprising a ceramic material in the form of a honeycomb as well as the process for producing the ceramic material. The heating element is characterized by its relatively high amount of heat generation capability compared to a conventional heating element of the same size. Preferable ceramic materials for the heating element have a temperature coefficient of electrical resistance of from 5 to 20%/.degree.C., and consist essentially of from 38.7 to 47.3 molar % of BaO, from 2.5 to 11 molar % of PbO, from 49.8 to 50% of TiO.sub.2, from 0.05 to 0.3 molar % of a semiconductor forming element and from 0.002 to 0.015 part by weight of Mn.

Abstract: A drop-out on an oblique video channel of a video recording magnetic tape is recognized by marking a signal on the voice channel relating to that drop-out. The marking signal on the voice channel is positioned on the line perpendicular to the moving direction of the tape, and the drop-out resides on said line. After developing the tape thus marked, the mark is first visually recognized, and the corresponding drop-out is detected also visually on said line.

Abstract: A magnetic recording medium comprises a substrate coated with a magnetic layer wherein a magnetic powder is orientated in a cured binder comprising a vinyl chloride, vinyl acetate copolymer having more than 10 wt. % of vinyl alcohol component and a polyester and a nitrocellulose.

Abstract: A magnetic recording medium comprises a substrate coated with a magnetic coating composition comprising nitrocellulose impregnated with a vinyl chloride-vinyl acetate-vinyl alcohol copolymer having a content of vinyl alcohol component of 8 wt. % or more, a magnetic powder, a solvent, and a thermal crosslinking agent.

Abstract: An insoluble electrode for electrolysis which comprises repeatedly coating and baking a slurry of palladium oxide containing a platinum compound which can be thermally decomposed to form platinum metal, optionally the other metal salt or oxide in a solvent and a solution of a platinum compound which can be thermally decomposed to form platinum metal in a solvent on a conductive substrate in optional order at two or more times.

Abstract: In a honeycomb heating element comprising a PTC thermister body, a single electrode layer composed of a silver paste was conventionally used for applying power to the body. In the present invention, two or three electrode layers with improved electrical and chemical properties are used to provide the heating element with a long service life, improved reliability and a high heat generation.

Abstract: A molding method comprises a step of fitting a movable mold to a stationary mold and filling a molten resin into a cavity formed by the mold fitting; a step of separating the movable molds; a step of releasing a molded product held by one or more push pins while shifting the push pins; a step of holding the molded product by a guide having a .]. shaped sectional view; and a step of releasing the molded product from the push pins to pass the molded product along the guide having a .]. shaped sectional view.

Abstract: A tape cassette comprises an upper half casing and a lower half casing and male hollow cylindrical projections having a notch mounted on either of the upper half casing or the lower half casing and female hollow recesses mounted on the other half casing at the corresponding positions. The upper and lower half casings are superposed to fit the male hollow cylindrical projects into the corresponding female hollow recesses and are fixed together by screwing self-tap bolts from the female hollow recesses into the male hollow cylindrical projections having notches to fix the projections on the inner surfaces of the female hollow recesses.

Abstract: A method of manufacturing a ferromagnetic metal powder by continuously drying and subsequently heat treating a slurry of ferromagnetic metal powder formed by wet reduction, characterized in that a non-oxidizing gas is supplied in separate streams to the two processes, and the non-oxidizing gas used in the drying and heat treatment is treated and recovered through separate circuits for recycling to the corresponding processes of drying and heat treatment. The separate circuits for recycling the non-oxidizing gas, the conditions in the separate two circuits are made optimum and independently adjustable so that a ferromagnetic powder of good properties is obtained.

Abstract: A compact hand-held demagnetizing device is used for demagnetizing a magnetic recording and reproducing head. It comprises a handle portion and a demagnetizing head. The handle portion contains a circuit for generating a decreasing alternating current for exciting a drive coil for the demagnetizing head. Means is provided to indicate the time when the demagnetizing operation is initiated or when the demagnetizing operation can be initiated and when the demagnetizing operation is completed.

Abstract: Disclosed is the addition of at least two elements of Nb, V, Ta and Zr to the ternary alloy of R (rare earth)-Co-Cu for permanent magnet materials, to thereby provide the permanent magnets with increased coercive force, residual magnetization and energy product. The additional elements enable employment of such Cu and Fe contents of the alloy as less than 10% and more than 6%, respectively. These percentages were avoided in the prior art to prevent the reduction of Br and Hc, respectively.