Abstract: A cleaning brush for brushing clothing has a slip case that circumferentially surrounds a passage having a brush therein. The slip case has open ends, the brush being slid into and out of the slip case through either end. The slip case acts as a handle. Stops are provided at each of the open ends to prevent the brush from being separated from the slip case.

Abstract: A floor-sweeping machine consisting of a housing with a revolving brush which is mounted rotatably therein and is driven by means of running wheels and which is located between two dirt-collecting spaces, the two dirt-collecting spaces being formed by dirt-collecting containers which can be taken out of the housing upwards, and the dirt-collecting container having a resilient locking device which secures it in its operating position and which can be transferred by hand into its release position, and in which, to make it substantially easier to operate and especially to take out and empty the dirt-collecting containers, the two dirt-collecting containers 24, 25 are connected to one another and have a common top side 27 in which, approximately centrally, there is a part 35 which is to be grasped by the operator and is to be moved to a limited extent in the lifting-out direction and which, when moved in the lifting-out direction, transfers the resilient locking device 36 into the release position.

Abstract: Floor-sweeping machine consisting of a housing with a revolving brush which is mounted rotatably therein and which can be driven by means of running wheels projecting from the under side of the housing, and in which, for the purpose of rapid assembly and removal, the revolving brush 14 is mounted rotatably by means of two bearing clasps 19 which engage on its ends and which each have a bearing receptacle 24 for the associated bearing end of the revolving brush 14, and the bearing clasps 19 are themselves retained by securely positioned clamping onto housing parts 23.

Abstract: The source wavelength dependent delay produced in a single mode fiber is equalized by causing the emergent light beam therefrom to be incident on a dispersion element which is such as to transmit the beam of light at an angle or position dependent on the source wavelength. The transmitted beam of light is launched into a length of multimode fiber such that the beam emergent therefrom is equivalent to the single mode fiber emergent beam but with the delay thereof equalized. If the multimode fiber is step index fiber the transmitted light at which the delay is the least is launched thereinto at the maximum angle, whereas the transmitted light at which the delay is the most is launched thereinto along the axis thereof. Alternatively, a graded index fiber can be employed for the multimode fiber.

Abstract: A metallic material coating is applied to the external surface of a freshly drawn optical fiber while such surface is still pristine by passing the optical fiber through a body of liquid metal-organic material which forms a layer on the fiber, and by subsequently removing all non-metallic components from the layer of metal-organic material by volatilizing the same. The optical fiber with the layer metal-organic material is passed through a baking oven in which at least the layer is heated to a baking temperature at which organic materials present in the metal-organic material are volatilized and the remainder is baked to the fiber. Then, at least the layer is fired in a firing chamber at a higher temperature at which the metal-organic material is decomposed into its volatile non-metallic and non-volatile metallic components, the latter remaining in the layer and the former becoming volatile and leaving the layer.

Abstract: A gate member for a gate valve provides improved sealing by providing for proper orientation of the gate member as it approaches its closed position and then providing improved sealing action as the gate member is closed further. A lip on the gate member overlaps a ledge on the valve body at the opening where the gate member enters the valve chamber. The lip is covered by a seal of resilient material having a cross-sectional shape that cooperates with the valve body to orient the gate member and that controls the compression of the seal between the lip and ledge as the gate member closes further. The shape of the gate member also helps to orient it while it is closing. A spine and a ridged cap of resilient material on the leading edge of the gate member cooperate to prevent blow-by of pressurized fluid when the gate member is closed. Pads integral with the seal contact the corners of the opening initially to orient the gate member and then to fill the corners when the gate member is closed further.

Abstract: A digital filter arrangement in which an input pulse stream is entered in consecutive non-overlapping groups into a first shift register. The contents of the first register are transferred in parallel into a plurality of shift registers. Bits are read-out from selected positions of the plurality of shift registers to form address words for individual read-only memories (ROM). Each ROM has stored therein weighted impulse response outputs which are read out in accordance with the address words. The outputs from the ROM's are added in logic circuitry and the combined output is fed into a latch. The contents of the latch are entered into a buffer from where they are read out serially. If the input clock rate is 28 MHz and the plurality of shift registers number eight, the plurality of shift registers, the ROM's and the logic circuitry operate at 3.5 MHz.

Abstract: Feedback equalization is employed for digital repeaters of transmission systems having twisted-wire pairs, in order to reduce intersymbol interference while minimizing near-end crosstalk gain. Previously the incoming signal was selectively amplified at the higher frequencies in order to negate intersymbol interference, with subsequent near-end crosstalk gain. According to the present invention the intersymbol interference element of an incoming signal is cancelled, prior to amplification in an adder by a compensation signal derived from the output signal of a regenerator and a retimer. An output stage serves to amplify and shape the resultant signal to a form suitable for transmission. The compensation signal comprises the inverted output of a filtering and scaling network.

Abstract: Ceramic capacitors are made by printing green ceramic limps with a fugitive electrode material, stacking the printed limps and firing the stacked assembly to form the ceramic and remove the fugitive electrodes. This provides an array of laminar voids in the body. The ceramic is doped to form boundary layers, terminations are applied, and the voids are then filled, such as by vacuum impregnation, with an electrode metal.

Abstract: A dielectric composition which is particularly suitable for the manufacture of ceramic capacitors, comprises lead magnesium niobate with additions of one or more lead titanate, lead stannate, or lead zirconate. The composition can be fired at a temperature between 950.degree. and 1100.degree. C., which is lower than the conventional firing temperatures of 1200.degree. to 1400.degree. C. The lower firing temperature means that, in the case of multilayer ceramic capacitors, the internal electrodes can be made of cheaper materials than previously with resultant materials and process cost savings. Some of the compositions exhibit higher dielectric constants than conventional Z5U ceramics, which means that capacitor device size can also be reduced.

Abstract: A transverse mode stabilized injection laser with a planar active layer is provided with a transverse waveguiding effect by the presence of a rib of intermediate refractive index material protruding through a blocking layer overlying the active layer. Optionally the blocking layer may include high refractive index material to provide additional waveguiding effect and controlled attenuation of higher order transverse modes.

Abstract: A single channel duplex transmitter/receiver utilizing digital frequency shift keying (FSK) signals. An analogue-to-digital converter frequency modulates the output of a local oscillator whose output is coupled via a mixer/combiner/splitter network to an aerial. FSK signals received from the aerial in the receiver are mixed with the local oscillator output in network to provide quadrature signals which are low-pass filtered before being demodulated in a zero IF demodulator to give a digital output. To avoid unwanted sidetone the output of the A/D converter is fed through a delay to a digital network where it is subtracted from the corresponding signals fed back through the demodulator. The digital signals are then fed to a D/A converter.

Abstract: In a digital system, especially where PCM coded speech is conveyed over twisted pair cables optimized for analogue speech, a pulse is received distorted, the distortion being especially bad on the trailing edge of the pulse. This decays slowly enough to cause intersymbol interference with the next pulse.This is overcome by applying the signal from an amplifier (11), FIG. 4, to one input of a subtractor (12) via a delay and attenuation circuit (13-15) and to the other input of the subtractor directly. The delay (13) is such as to optimize the peak of the received pulse, and the attentuation level is calculated to cancel out the tail of the received pulse so that it is zero at the center of the sampling point of the next bit.

Abstract: A demodulator of the type employed in a "zero-IF" system uses a local oscillator for providing guadrature output signals at the center frequency of an FM signal to be demodulated. The demodulator has first and second mixers for separately mixing the FM signal with the quadrature signals to provide a first and second output signal each in quadrature at the outputs of said mixers. These signals are low pass filtered. The demodulator includes third and fourth mixers with each mixer receiving at an input one of the low pass signals. At another input the mixers receive third and fourth signals. The third and fourth signals are derived from mixing a variable controlled oscillator (VCO) signal with the local oscillator guadrature signals. The outputs of the third and fourth mixers are applied to the inputs of a difference amplifiers, the output of which controls the frequency of the VCO in an automatic frequency control mode (AFC) to cause the output of the difference amplifier to provide demodulated signal.

Abstract: The digital demodulation of frequency modulated signals produces a pulse duration modulated signal proportional to the analog modulation signal component of the FM input signal from the FM input signal and a delayed version thereof and the pulse duration modulated signal is then converted to a digital signal representative of the analog modulation signal component of the FM signal by a delta sigma modulator and a decimator which also provides equalization of the FM signal to remove pre-emphasis applied to the FM signal prior to its transmission.

Abstract: Ashing rates of encapsulants exposed to an oxygen plasma in a reactor are increased by simultaneously exposing a solid halogen-substituted hydrocarbon polymer to a plasma jet formed within a cavity in a grounded conductive surface of the reactor. Advantageously the solid reactant may be polyvinyl chloride or polytetrafluorethylene in solid form.

Abstract: An image intensifier tube and a method of making same is disclosed wherein veiling glare caused by the amplification of off axis light is reduced. Included is a colored, low reflective, light absorbing layer formed in the face plate of the tube adjacent any surface at which off axis light could otherwise be reflected to the photoemissive device associated with the face plate.

Abstract: Connection to a tantalum capacitor electrode (17) is effected using a conductive paint layer (15), incorporating pure silver and pure copper particles, which minimizes silver leeching by a tincontaining solder alloy (18) by which the lead wire (17) is connected to the conductive paint layer (15), and thus minimizes power factor degradation.

Abstract: The data eye monitor includes a pair of comparators which compare the data input signal with a fixed reference voltage and a variable reference voltage with the resultant output of these two comparators being clocked into a digital comparator providing negative pulses representing the difference between the outputs of the two comparators. The negative pulses are coupled to an integrator to which a positive current source is coupled with the integrator providing the variable reference voltage for one of the comparators and also the output voltage of the monitor since the variable reference voltage is proportional to the opening of the data eye.