Abstract: A highly efficient battery charging system in which the ampere-hour discharge of the battery is sensed for controlling the battery charging rate. The battery is charged at a relatively high charge rate during a first time period proportional to the extent of battery discharge and at a second lower rate thereafter.

Abstract: Two matrix arrays comprised of Gate Injected Metal Oxide Semiconductor (GIMOS) non-volatile memory elements. Interconnection is made via inverters to form an electrically Alterable Programmable Logic Array (ALPLA).

Abstract: A capacitor comprises a resilient strip of magnetic material, such as steel, a strip of non-magnetic material such as brass and a layer of insulation between the two. An end portion of the resilient strip is movable between a position substantially parallel and close to the brass strip and a position as an angle to and spaced further from the brass strip. A magnetic coil or permanent magnet controls the position of the movable end portion of the resilient strip relative to the brass strip to thereby control the capacitance between the two strips.

Abstract: Apparatus using microwave energy for the therapeutic and hyperthermic treatment of an internal body organ such as the prostate gland. An irregularly shaped coaxial applicator having a narrow portion and a wide portion is inserted through the male anus into the rectum such that a substantially maximum intensity of the microwave energy irradiates the prostrate gland for preferential heating of the prostate gland and a substantially minimum intensity irradiates untreated tissue. Temperature sensing means are positioned on the periphery of the applicator to measure the tissue environment irradiated by the microwave energy. A controller, operating with the temperature sensing means, is provided to maintain the temperature of the tissue environment within a desired temperature range.

Abstract: A transmission line hybrid junction which provides a power dividing and combining function between a first port and a pair of ports. In one embodiment it provides a well-matched, high-isolation, three-port, equal-power, equal-phase, power dividing junction with a bandwidth adequate for typical radio frequency applications. The hybrid junction comprises a single transmission line coupled to a pair of branch transmission lines, and a single resistive element coupled between the branch lines. The single transmission line comprises a quarter wavelength transforming section and each of the branch transmission lines comprises two cascaded quarter wavelength transforming sections. Coupling between two transforming sections of the branch transmission lines permits independent selection of the characteristic impedance of those sections in the odd and even modes of excitation.

Abstract: A skylight cover which can be used as a heat and smoke vent for a roof of a building includes a cover which deforms and disengages from a curb structure on the roof, and is coated with a thermally insulating coating which thermally protects the cover from the cooling effects of ambient precipitation.

Abstract: A circuit for determining each level transition of first and second two logic level input signals and their leading or lagging phase relationship at each level transition and comprising first and second signal level storage means each having first input means responsive to the first and second input signals, respectively, first output means, and clock input means and responsive to a clock signal supplied to the clock input means to cause the logic level on its output means to become equal to the logic level on its first input means. First and second Exclusive OR gates each have a first input means connected respectively to said first input means of said first and second signal level storage means, and a second input means connected respectively to said first output means of said first and second signal level storage means.

Abstract: A solenoid comprises two coils wound on a common axis and a core within the coils which is supported for movement along the axis. Direct currents are applied substantially continuously to the two coils for resistively heating the solenoid to a temperature substantially above the ambient temperature. The direct currents are applied in the same direction to the two coils to produce additive magnetomotive forces when it is desired to energize the solenoid and in opposite directions to the two coils to produce subtractive magnetomotive forces which tend to cancel, when it is desired that the solenoid be in its unenergized condition.

Abstract: An envelope detector with an extended linear dynamic range. A first amplitude modulated carrier signal, which can be of an intermediate frequency, is supplied to a first input terminal of a mixer, preferably balanced. The said first signal is also amplified and limited to produce a second signal which is phase synchronized with the carrier signal of said first signal, and which is supplied to the local oscillator input terminal of the mixer. The mixer responds to said first and second signals to produce a substantially dc (baseband) output signal whose waveform is similar to the envelope of said first signal.

Abstract: A ranging radar of the radio frequency (RF) frequency modulated-continuous wave (FM-CW) type transmits an RF FM-CW signal to a reflecting surface at an unknown range R from the radar. The reflecting surface reflects the signal to a modulating device. The modulating device further modulates the signal at a frequency F which is high in comparison to the modulating frequency of the FM-CW signal. The further modulated signal is transmitted by the device to the reflecting surface and back to the ranging radar where it is subtractively mixed with a sample of a transmitted signal. The mixed signal is at frequency F amplitude modulated by a beat frequency, the period of which corresponds to range R. The frequency F is removed from the mixed signal leaving the beat frequency signal from which is determined range R.

Abstract: A data communications system for transmitting and receiving 64 different audio-frequency signals representing 64 respective alpha-numeric code symbols. A synchronizing signal consists of three time-spaced bursts where each burst consists of three audio-frequency signals. A following information signal consists of a three time-spaced message bursts where each burst consists of twenty audio-frequency signals, all three of the message bursts containing the same audio-frequency signals but in different orders. A receiver includes synchronizer means to recognize the predetermined synchronizing signal, and decoder means enabled and synchronized by the synchronizer means to decode the information signal. The audio-frequency signals may be 64 different fixed-frequency tones, or may be 64 differently-changing signals such as may be produced by unidirectional phase shift keying by 64 different pseudo-random number codes.

Abstract: A matrix array of row and column conductors, electrically isolated from each other, with a key switch connected between a row and a column conductor at each intersection of a row and a column conductor. Each column conductor is connected to a normally non-conducting current sourcing circuit and each row conductor is connected to a normally non-conducting current sinking circuit. Each key switch, when closed, connects its associated row and column conductors causing current to flow between that column's current sourcing circuit and that row's current sinking circuit. The current sourcing and the current sinking circuits associated with the particular switch closure then produce signals indicative of that key switch closure.

Abstract: The use of a digital frequency translator, using pulse snatching techniques, for multiplying the output frequency of a precise and accurate frequency synthesizer by a preselected certain numerical fraction permits the frequency synthesizer to be referred to a molecular clock with only a single VCXO phase lock loop.

Abstract: A printed circuit board support structure for supporting a number of printed circuit boards in a vertical spaced orientation while permitting access to either side of any selected circuit board includes a central, vertically oriented, support post and a plurality of pivotally mounted printed circuit support frames which extend from the post. A structure is provided to rotate each frame about the axis of the post from its initial position to at least a second position at right angles thereto with the printed circuit board in a vertical orientation in both positions of the frames.

Abstract: Irises which exhibit capacitive reactance in a heavily loaded rectangular waveguide comprise generally U-shaped conductive vanes positioned in the waveguide perpendicular to the length of the waveguide with the opening of the "U" toward a broad wall of the waveguide but spaced therefrom. These irises are effective for increasing the electrical length of ferrite rectangular waveguide phase shifters. These irises may be added to the completed phase shifter to adjust its length by inserting them through previously formed apertures in one of the narrow walls of the waveguide.

Abstract: A thin plate of III-V direct-bandgap semiconductor, preferably with anti-reflective coatings, operates as superior optical filter for light having a wavelength which exceeds a given wavelength in the visible or infra-red spectrum. Such a filter is particularly suitable for use in a duplex optical communication system employing a fiber-optic transmission line.

Abstract: A circuit for detecting each level transition of a first two-level signal of a given frequency and its leading or lagging phase relationship with a second two-level signal of said given frequency, and comprising signal level storage means having a data input terminal for receiving said first signal, a first output terminal, and a first clock pulse input terminal, and constructed to store the signal level supplied to its data input terminal and to transfer said stored signal level to its output terminal when a clock pulse is supplied to the clock pulse input terminal. First and second voltage comparator means each have a first input terminal for receiving said first and second signals, respectively, a second input terminal connected to said first output terminal and each constructed to respond to equal or non-equal signal levels supplied to their first and second input terminals to produce first and second input signals, respectively.

Abstract: A system for detecting and correcting a stuck condition on the bus lines of a parallel multi-channel data transmission system. The system comprises a transmitter for generating N data signal having first and second logic levels, a receiver for receiving said N signals, and a plurality of N data channels connecting said transmitter with said receiver. Each data channel comprises first and second Exclusive OR (XOR) gate means each having first and second input means and an output means. A data input signal is supplied to the first input means of said first XOR gate and the output of the second XOR gate is supplied to said receiver. Bus line means connects the output means of said first OR gate to the first input means of said second XOR gate.

Abstract: Two adjustable level signal translating devices in separate signal paths are arranged to receive an input alternating frequency signal and to pass the signal at respective desired levels to a vector summing circuit. One of the signal paths undergoes an additional 90.degree. phase shift. The vector summing circuit produces an output signal shifted in phase by an amount between 0.degree. and 90.degree. relative to the input signal depending on the levels of signals from the two translating devices.

Abstract: A filament winding apparatus useful, for example, with a machine for heat setting filaments for tufted textile materials, such as carpeting. The apparatus includes two winding headers which are operated in synchronism for concurrently receiving two filaments from the heat setting machine and a tension device for applying uniform tension on both filaments as they leave the heat setting machine. A timing belt provides synchronism between the two winding headers and an anti-slip drive apparatus insures positive engagement of the drive rollers with the winding spindles in each header during the winding operation.