Abstract: The present amplifier has a pair of semiconductor amplifiers, and the input signal is divided to said amplifiers, the outputs of which are combined together by the power combiner. At least one of the power divider and the power combiner has a plurality of circulators which have three terminals. The characteristic impedance of one terminal is 2Z.sub.O and that of another terminals is Z.sub.O. Thus, by connecting the terminals of the characteristic impedance 2Z.sub.O of two circulators, the resultant characteristic impedance Z.sub.O is obtained and can be connected to an external circuit directly.The present amplifier can be utilized in particular in VHF or higher frequency band.

Abstract: A rubber or plastic magnet of high magnetic properties is produced by incorporating a magnetoplumbite type magnetic powder into a rubber or thermoplastic or thermosetting matrix at a high concentration with a high degree of orientation of the magnetic particles. Such high concentration and orientation can be obtained by using a magnetoplumbite type magnetic powder having a compressed density in the range between 3.30 g/cm.sup.3 and about 3.55 g/cm.sup.3 and an average particle size of about 1.00 and 1.50.mu., said particles being prepared by dry crushing process from coarse sintered particles and having predominantly single crystal structure.

Abstract: A magnetic recording medium having improved electromagnetic conversion characteristics and physical properties prepared by using a three-component binder consisting of a polyurethane resin, a phenoxy resin and a vinyl chloride-vinylidene chloride resin.

Abstract: A displacement sensor which provides the output electrical signal proportional to the mechanical movement or displacement, without utilizing the mechanical friction. The present displacement sensor comprises of a cylindrical bobbin, a pair of solenoid coils provided on said bobbin with the predetermined spacing between each coils, the length of each of the solenoid coils being the same as that each other, a ferrite core adjustably inserted in said bobbin, a support connected to said ferrite core and an external device the displacement of which is to be sensed, a means for connecting the leads of said coils to external lead lines, and the length of said ferrite core being so defined that the total inductance of the series connected coils is independent from the position of said ferrite core in said bobbin.

Abstract: A magnetic recording medium comprises a substrate coated with a magnetic layer comprising a magnetic powder, a thermosettable binder and a mixture of sorbitane mono-, di- and tri- higher fatty acid ester surfactants.

Abstract: In a process for producing an iron oxide having magnetite as a main component by heating to reduce a powder of an oxide or a hydrated iron oxide comprising an iron oxide as a main component in an atmosphere for reduction, an improvement characterized in that said atmosphere for reduction is formed by passing an industrial liquefied nitrogen gas.

Abstract: A novel non-linear resistance element or a varistor element is proposed which is a sintered body composed of a ternary oxide mixture comprising titanium dioxide as the base component, bismuth oxide and a third oxide component selected from the group consisting of oxides of tantalum, niobium and antimony admixed in limited proportions. The sintered body is prepared by subjecting the powder mixture obtained by admixing a solution containing tantalum, niobium or antimony with titanium dioxide and bismuth oxide to sintering following drying and calcination. The varistor element of the invention is stable in its performance and has a sufficiently high non-linearity index so that excellent noise suppressors are prepared with the varistor element to be useful in absorbing the noise voltages generated in various rotatory machines such as miniature motors.Further improvement in the above varistor element is proposed by adding a small amount of silicon dioxide to the ternary oxide mixtures.

Abstract: A tape pad for a tape cassette for continuously contacting a magnetic tape under pressure in a casing wherein the tape pad has a fitting hollow in which a supporting member non-rotatably mounted on the casing is inserted to support the tape pad.

Abstract: A magnetic recording tape comprising a polyethylene terephthalate substrate and a magnetic material-containing layer closely adhered onto the substrate, which tape exhibits a reduced envelope variation. The polyethylene terephthalate substrate satisfies the formula:0.051H.sub.1 -0.59A+0.14 .DELTA.n+0.0015 (H.sub.2 -66.67).sup.2 +50.92.ltoreq.20wherein A is the average particle size of the polyethylene terephthalate crystals as determined from the half height width by X-ray diffractometry, and H.sub.1 is the average number of projections present in a unit area of 1 mm.sup.2 on the surface of the substrate, which projections have a height falling within the range of from 0.27 to 0.53 micron, H.sub.2 is the average number of projections similar to H.sub.1 above but having a height falling within the range of from 0.54 to 0.80 micron, rather than 0.27 to 0.53 micron, and .DELTA.n is the birefringence of the substrate.

Abstract: A magnetic recording medium having more than 550 Oersted of a coercive force, less than 1.8 of a ratio of a coercive force at -196.degree. C. to a coercive force at 25.degree. C., less than 1.0 wt. % of a content of Fe.sup.2+ is prepared by incorporating a magnetic powder obtained by dispersing acicular .gamma.-Fe.sub.2 O.sub.3 in an aqueous solution of a cobalt salt and reducing it with a reducing agent to deposit a cobalt compound on the acicular .gamma.-Fe.sub.2 O.sub.3.

Abstract: An alarm for indicating a lack of liquid in an ultrasonic nebulizer is disclosed. The alarm is responsive to a level sensing device in the nebulizer used to terminate oscillation in response to a low liquid level situation.

Abstract: Both solid magnetic coat layers formed on a substrate of a magnetic recording medium by coating a magnetic varnish are simultaneously smoothed by passing the magnetic recording medium between one or more pairs of rigid rotary rolls which press both magnetic coat layers during their rotation.

Abstract: An ultrasonic transducer including a thin piezo-electric substrate and an interdigital electrode radiating ultrasonic wave beams with excellent focusing characteristics into a liquid medium in contact with the substrate by applying AC voltages to the electrode.

Abstract: The epitaxial growth of boron-phosphorous semiconductors can be accomplished by chemically reacting the gas materials diborane and phosphorous trichloride. The preferable temperature of the substrate in 880.degree. C.-1,110.degree. C. and the preferable ratio of the phosphorous trichloride to diborane in mol is 2-200. Use is made of a composite substrate.

Abstract: A magnetic recording medium comprises a substrate coated with a magnetic layer wherein a magnetic powder is orientated in a binder and a polyoxyethylenesorbitane higher fatty acid ester surfactant.

Abstract: An improved magnetic tape cassette and separation sheet therefor. The separation sheet, positioned between an inner wall and the tape reels of a cassette, is formed with at least one dome-like protrusion. A plurality of such protrusions are preferably utilized spaced throughout the sheet, each of a diameter R and height H sized to provide an R/H ratio of between about 100 and 10. The separation sheet may be formed with a protrusion shaped to fit into a window in an inner case wall, the window-fitting protrusion extending from a side of said separation sheet opposite from that containing said dome-like protrusions.

Abstract: A magnetic recording medium made by coating a base with a magnetic coating material which is a dispersion of magnetic particles in a binder of synthetic resins using a polyfunctional aromatic isocyanate as a curing agent, characterized by the addition of a sorbitan stearate type surface active agent which has a sorbitol derivative in the hydrophilic group. The present magnetic recording medium has superior mechanical properties, especially a superior running quality as well as superior electromagnetic properties.

Abstract: A filter operable in a microwave frequency band comprises a conductive closed housing having a bottom wall, an upper wall and side walls between said bottom wall and the upper wall, a plurality of resonators fixed on a straight line on the bottom wall inside of the housing, one end of each resonator being grounded to the bottom wall and the other end of each resonator being free standing, each resonator having at least an elongated center conductor and a dielectric body covering the center conductor at least partially in the longitudinal direction of the center conductor, a pair of connectors mounted at the opposite ends at the side walls for coupling the filter with an external circuit, a pair of loops each connected to the inner conductor of said connector and one end of the loops being grounded to the bottom wall, a pair of confronting conductive disks being provided between the free standing end of each center conductor of a resonator and the upper wall to provide the capacitance between said free standin