Abstract: A system for determining the presence or absence of coolant liquid as well as for monitoring the effectiveness of corrosion inhibition of the liquid includes a high impedance differential amplifier to which two electrodes, adapted to be immersed in the liquid, are connected. The high impedance differential amplifier measures the d.c. potential of the electrodes as an indication of the effectiveness of the corrosion inhibition characteristic of the liquid. The output of the amplifier is connected to a detector which in turn is connected to conventional indication means such as a light emitting diode. A conventional power source provides positive and negative power to the amplifier. The output of the amplifier is also connected to one of its two inputs through a feedback network comprising a capacitor and a resistance which includes the resistance between the electrodes.

Abstract: A connector assembly comprises a lead frame mounting one or more semiconductor chips, having optically active areas, a fiber guide and optical fibers held in optical communication with the chips. The fiber guide is formed of a plate like member having two or more reference points, in order to precisely locate the fibers relative to the chip. Several embodiments of the guide are shown including a plate having fiber receiving bores extending therethrough as well as a plate having fiber receiving grooves extending along sides thereof preferably used in conjunction with a bar biased against fibers disposed in the grooves. The bar, which may be made of elastomeric material is shown having a straight edge facing the grooves while a variation of the bar is provided with an additional set of grooves. The lead frame mounts a relatively large thermally and electrically conductive pad which in turn mounts the semiconductor chip having optically active areas.

Abstract: A connector assembly comprises a lead frame mounting one or more semiconductor chips, having optically active areas, a fiber guide and optical fibers held in optical communication with the chips. The fiber guide is formed of a plate-like member having two or more reference points, in order to precisely locate the fibers relative to the chip. Several embodiments of the guide are shown including a plate having fiber-receiving bores extending therethrough as well as a plate having fiber-receiving grooves extending along sides thereof preferably used in conjunction with a bar biased against fibers disposed in the grooves. The bar is shown having a straight edge facing the grooves while a variation of the bar is provided with an additional set of grooves. Either the bar, its respective plate or both may be made of elastomeric material to allow for variations in fiber diameter.

Abstract: A medical patient condition monitoring system includes a portable battery-operable transmitter module which transmits monitored conditions of the patient via infrared energy to the receiver input stage of a medical monitoring and display unit. In one embodiment, the transmitter module which may be worn on the patient's person includes medical electrodes which are coupled to the patient's skin to receive electrical signals generated by the patient's anatomy. A voltage-controlled pulse position modulator circuit is coupled to the medical electrodes for generating pulses controllably positioned in time from a reference frequency in dependence upon the amplitude of the signal generated by the medical electrodes. An infrared light-emitting device is coupled to the output of the pulse position modulator circuit for generating infrared energy bursts in synchronism with the pulses generated by the modulator circuit.

Abstract: The disclosure relates to high gain electrical relays which are operable at very low power levels and which, when arranged in a relay system with impedance matching to an energizing power source, are operable at the low power levels used in energizing integrated circuits. The relays utilize nickel-titanium alloy wires which are conditioned and arranged to display sharp, reversible changes in shape and modulus of elasticity as the wires are heated and cooled through a temperature transition range, the alloy wires being disposed, preferably with impedance matching means between the wires and energizing power sources, to be heated through the noted transition temperature range by directing current from such low power sources through the wires, thereby to initiate relay operation. The relay construction provides unusually high gain so that relay operation from such low power sources is effective for regulating operation of various types of components used in electrical apparatus.

Abstract: A self-regulating electrically heated positive-temperature-coefficient (hereinafter PTC) carburetor stove for use in the fuel entry system of a gasoline engine is connected through the ignition system directly to the battery for rapidly heating of the stove upon starting of the car. The system comprises a plurality of PTC pills housed in and insulated from a container with a high thermal conductivity top plate in direct heat transfer relation with the pills. Gasoline droplets are evaporated on this plate during cold start conditions to minimize the need to run a cold engine in the closed choke gasoline rich mode. During heat-up of the engine the PTC pills reach the anomaly temperature and at that point greatly increase their resistance thereby virtually terminating the power requirement of the stove in the heated engine mode.

Abstract: The disclosure relates to high gain electrical relays which are operable at very low power levels and which, when arranged in a relay system with impedance matching to an energizing power source, are operable at the low power levels used in energizing integrated circuits. The relays utilize nickel-titanium alloy wires which are conditioned and arranged to display sharp, reversible changes in shape and modulus of elasticity as the wires are heated and cooled through a temperature transition range, the alloy wires being disposed, preferably with impedance matching means between the wires and energizing power sources, to be heated through the noted transition temperature range by directing current from such low power sources through the wires, thereby to initiate relay operation. The relay construction provides unusually high gain so that relay operation from such low power sources is effective for regulating operation of various types of components used in electrical apparatus.