Abstract: An improved door opening/closing device for cassette tape player is disclosed in which an abutting member and a door opening/closing member composed of an arm portion and a pivoting portion are provided in order to interlock the door opening/closing with the movement of a cassette movement holder. This makes it possible to omit the use of an additional separate gear, thereby making it possible to skip the time-consuming work for assembling of the additional gear.

Abstract: A device for discouraging small domestic or wild animals from frequenting areas where they may become a nuisance. The device comprises a mat made of non-conductive material to be spread over the area. A plurality of conductive surfaces are spaced on the upper surface of the mat so that adjacent conductive surfaces are electrically insulated from each other. An electric control is associated with the conductive surfaces and provides electric power thereto so that when an animal walks on the mat its body completes a circuit between live and ground areas on the mat and the animal is thereby provided with an unpleasant electrical sensation.

Abstract: A strobe trigger pulse generator includes a power supply, an energy storage capacitorcoupled to the power supply and a trigger pulse generator which intermittently generates trigger pulses to energize a trigger pulse transformer. The pulse generator includes a trigger capacitor having first and second leads, the first of which is coupled to the trigger pulse transformer. A trigger capacitor charge circuit includes an input terminal coupled to the power supply and an output terminal coupled to the second lead of the trigger capacitor to establish a current flow path between the power supply and the trigger capacitor to direct a charge current to the trigger capacitor. A trigger capacitor discharge circuit is coupled to the second lead of the trigger capacitor to periodically direct a discharge current from the trigger capacitor through the trigger pulse transformer to generator a high voltage trigger pulse.

Abstract: A glass fracture detection system includes a circuit having a sensor for providing an output signal when a glass fracture occurs. The sensor is positioned within a housing so that, when the housing is mounted on the surface of the glass adjacent the frame in which the glass is encased, the sensor is automatically positioned in communication with the glass surface at a specified distance from the frame, which distance is selected so as to reduce damping of the output signal due to the presence of the frame and to reduce signals reflected from the frame to the sensor.

Abstract: A pressure sensor for accurate readings of low pressures utilizes an ultrasonic transmitter which sends a signal to a movable diaphragm via a waveguide. Pressure changes across the diaphragm causes changes in the signal path length from transmitter to receiver which are translated into pressure readings via electronic circuitry employing phase comparator circuitry. The received signal is split into two signals one of which is shifted in phase. A temperature responsive controller selects which received signal is used in a comparison with the transmitted signal thus greatly extending the temperature range over which the sensor operates. The use of an ultrasonic waveguide with a length of at least twice the frequency of the transmitted signal coupled to the transmitter eliminates echoes and reflections and provides for enhanced accuracy in reading even very low pressures.

Abstract: Radiofrequency (RF) heating applicator, located at the distal end of a coaxial line catheter, produces deeper and more uniform heat dissipation. The active applicator element is a conductor helix fed via the coaxial line. The applicator has provisions for interception of intracardiac electrogram signal. A cardiac ablation system using the above catheter, ablates cardiac tissue responsible for ventricular tachycardia. The ablation system provides means to monitor intracardiac electrograms and to control the RF power. A variation of the helical applicator can be used in a hyperthermia system for treatment of malignant tumors.

Abstract: Disclosed is a method of locking the functions of a mobile telephone system. At least two lock codes are stored in a memory together with the functions to be kept locked or actuated when the locked state of the mobile system is released. The locked state of the automobile is not released unless a registered lock code is input. When the locked state is released by inputting one of the registered lock codes, some functions remain in the locked state in accordance with the input lock code, while other functions are actuated. Thus it is possible to limit the use of the mobile telephone system depending upon who drives the car.

Abstract: An air intake heater system for internal combustion engines is disclosed including a microprocessor controller, intake manifold air temperature sensing means, water in fuel sensors, electrical air heating elements actuated by the microprocessor, and system status indicators. Additionally, fuel injector timing is altered by the microprocessor depending upon intake manifold air temperature. Air intake heating is provided to assist cold weather starting of engines as well as for minimizing white smoke pollutants produced by diesel engines. Power consumption of the device is maintained below a predetermined level by judicious use of the microprocessor controller in conjunction with the electrical heating elements.

Abstract: Instructional apparatus for training automotive service technicians in the skills required for isolating, identifying and repairing malfunctions in sophisticated automotive electronic systems uses a group of electronic circuit modules wherein each module simulates at least a portion of an automotive electronic circuit and one or more modules may be connected to form more complex circuits. One or more jumper wires associated with each of the modules may be altered by an instructor to create at least one fault condition representative of an electrical malfunction in the circuit associated with the module.

Abstract: A counterelectrode and a method for providing the counterelectrode wherein an inherently high effective capacitance surface is formed on tantalum. The oxide forming ability of the tantalum surface is destroyed by removing existing oxide from the surface, depositing on the surface a layer of a platinum family metal, and alloying the deposited metal with the tantalum thereby forming an alloy layer. A second layer of metal, also selected from the platinum family, may then be deposited over the alloy layer. Alternately the platinum family metal may be sputtered or clad onto the surface of the tantalum with or without an alloying step. The second deposition produces a spongy layer and is accomplished by conventional electrolytic techniques.

Abstract: A motor driven ball valve may be driven in two modes of operation; those modes are a normal or testing mode and an emergency mode. The ball valve, when in its full open position, has an air passage that allows for the rapid exhaust of air in the air pipe of the air brake system to atmosphere, thereby inducing the emergency application of the brakes. The rotating ball valve assembly is capable of infinite variation between its full closed and its full open positions. Thus, the motor drive, which is remotely controlled, can effectively modulate the reduction in air pressure in the air pipe for a variety of purposes, including normal operation of the brakes and testing the air brake system. The motor drive mechanism may be in a cam, gear, or follower configuration. When an emergency application of the brakes is required, the motor drive mechanism is disengaged to allow a spring or other torsion device to rapidly rotate the ball to full open position, while drawing minimal electrical power.

Abstract: A method for mounting a transducer in a boat hull is disclosed where the transducer has a frusto-conical outer end portion adjacent an end which is to be mounted flush with the boat hull. Initially, a member is positioned at a predetermined location in the boat hull mold, which member includes an upwardly converging frusto-conical surface. The boat hull is then molded around the member and the molded boat hull removed from the mold. The transducer is then attached to the portion of the boat hull which was molded about the member. In one embodiment, the member is a plug and the plug is mounted to the hull mold so that the removing of the boat hull from the hull mold also includes the removing of the boat hull from the member. The plug can have a thickness greater than the boat hull, or less than the boat hull in which case a subsequent cylindrical hole is drilled in order to attach the transducer. In an alternative embodiment, the member is a collar having a cavity therein which receives the transducer.

Abstract: An apparatus for determining the length of an open or closed-end pipe by measuring the propagation delay of a sound pulse transmitted down the pipe bore. The apparatus includes an acoustic transducer, an acoustic detector and associated circuitry for computing the time required for an acoustic pulse to travel and return the length of a pipe. Electronic circuitry, including a microprocessor, is employed to provide the apparatus with an automatic gain adjustment feature. The gain circuitry increases the amplification until a return pulse of desired amplitude is obtained. The gain is time varying to make the last-to-return signals strongest thereby avoiding false readings from pipe discontinuities. Compensation is made for speed-of-sound variations due to temperature, humidity, and barometric pressure by direct measurement of speed of sound during each length measurement. The open or closed endedness of a pipe is determined by return signal charateristics and a correction factor applied for open-ended pipe.

Abstract: Method and apparatus for detecting the occurrence of heartbeats in an ECG signal which may also include pacer artifacts, comprising analysis of the ECG signal for providing a heartbeat signal indicating detection of the occurrence of a heartbeat, analysis of the ECG signal for providing a pacer artifact signal indicating detection of the occurrence of a pacer artifact, analysis of the ECG signal in a manner independent from the first-mentioned analysis for determining if a portion of the ECG signal which follows detection of a pacer artifact has changes in its amplitude level which indicate the validity of the heartbeat indicating signal, and use of the result of the last-mentioned analysis to control the providing of the heartbeat indicating signal by the first-mentioned analysis.

Abstract: A chip carrier socket comprises a frame which defines and surrounds a space for receiving a chip carrier. A plurality of elongated contacts are carried by the frame, the contacts each defining a first section which resides within the inner surface of the frame, and are positioned to conductivity engage peripheral contacts of a chip carrier carried in the space. The contacts also each define a second section positioned on one side of the chip carrier socket to engage conductive members of a circuit board when the socket is carried thereon. The second sections each define a contact end which projects inwardly. The chip carrier socket defines an open aperture within and through the frame adjacent the inner surface so that the inwardly projecting contact ends are visible while the socket is carried on a circuit board.

Abstract: An ultra-high density electrical interconnect system is described wherein the pins and sockets are generally triangular in cross-section. This configuration allows for a density of 400 or more contacts per square inch wherein the contacts are supported on a grid pattern having 50 mil or less spacing between intersections. Further, the substrate supporting the contacts need be no wider than 50 mil per row of contacts. Still further, at least three rows and columns of contacts may be provided with the 50 mil or less spacing.

Abstract: A new family of liquid crystalline or potential liquid crystalline compounds is made relatively cheaply generally by reducing an acid chlorine derivative alkyl or alkoxy benzene or its analogues of an alkyl cyclohexanoic acid to an alkanol derivative, converting the alkanol derivative to a halide such as the bromide or chloride and reacting said halide with a cyano phenol, cyanodiphenol and related compound to form a compound having the formula of equation 1.