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| Number | Title | Issue Date |
| 3992674 | Balanced dual output mixer circuit An improved balanced dual output diode mixer circuit having separate output terminals for audio and RF output signals is disclosed. The mixer circuit includes a first transformer having a primary and a center tapped secondary winding. The ends of the seco... | 11/16/1976 |
| 3989024 | Constant energy electronic ignition system A first sensor couples to an internal combustion engine and generates a first set of pulses suitable for ignition firing. A second sensor operates in synchronism to the first sensor producing a second set of multiple pulses, during the interval between a ... | 11/02/1976 |
| 3988730 | Multiple parameter monitoring and readout system with sampling of parameters of higher priority than the highest parameter which is out of tolerance Apparatus for monitoring and indicating parameter conditions within a system. Signals are generated by sensors which monitor parameter state. The signals are sensed via a multiplexing scheme, each signal being compared to an individually programmed refere... | 10/26/1976 |
| 3988675 | Transmit-receive switching circuit with audio muting A two-way AM communications apparatus is provided with common circuitry for biasing the transmitter and receiver on and off alternately while minimizing the switching noise heard in the audio. The push-to-talk button enables either the transmitter or the ... | 10/26/1976 |
| 3988644 | Current protection circuit An integrated circuit, current protection network wherein the point of operation (trip point) can be changed over a wide range of values by proportioning the areas of the junctions of semiconductor devices. A pair of transistors form a high gain different... | 10/26/1976 |
| 3986893 | Method for making nickel and cadmium electrodes for batteries An improved process for the electrolytic deposition of active material which may be in the form of a suitable metal hydroxide in a porous sintered nickel plaque, which in turn may be utilized to form the positive and/or negative electrodes of a nickel-cad... | 10/19/1976 |
| 3987477 | Beta compensated integrated current mirror A split collector lateral transistor wherein the amount of the emitter encircled by each of the collectors is unequal so that a greater current flows in one of the collectors and the base current plus the current flowing in the other collector is approxim... | 10/19/1976 |
| 3987401 | Indicating system using multicolor light emitting diodes An indicating system for a radio receiver is formed of an indicator and associated control circuitry. The indicator is comprised of two emitting diodes wired in parallel and in reverse polarity, and encapsulated in a translucent package. Each diode in an ... | 10/19/1976 |
| 3987245 | Compensated speaker-microphone A microphone which consists of a speaker having a base resonant frequency, a suppression circuit for reducing the frequency response of the speaker at the base resonant frequency, and a high pass filter for reducing the base frequency response of the spea... | 10/19/1976 |
| 3987344 | Plug-in module for electronic device having self-contained heat sink A small plug-in module includes a combined housing and heat sink, and plug-in terminals cooperating with mating terminals on a chassis. The module includes guiding structure to facilitate insertion of the module on the chassis, which may also form termina... | 10/19/1976 |
| 3986049 | Audio compressor/limiter amplifier An audio compressor amplifier including an operational amplifier with compressor means connected from the output to the input for compressing signals at the output to a predetermined constant level in a predetermined attack time and including a plurality ... | 10/12/1976 |
| 3984871 | Tape cartridge release assembly An improved tape cartridge release assembly for a player/reproducer apparatus of the type used in a vehicle will automatically release a cartridge when the vehicle ignition switch is turned off, will release a cartridge inserted while the ignition switch ... | 10/05/1976 |
| 3984776 | Signal quality detector An FM radio receiver with a discriminator having the output connected to a first bandpass filter, tuned to a frequency above the audio but within the bandpass of the discriminator, and to a second bandpass filter tuned to a frequency above the audio, with... | 10/05/1976 |
| 3983498 | Digital phase lock loop A fast responding, low jitter, digital phase lock loop which is especially suited for synchronous, non return to zero, digitally encoded clock recovery applications. Both leading and trailing transitions of the digital waveform triggers a monostable multi... | 09/28/1976 |
| 3982210 | Automatic gain control circuit for a crystal oscillator A single bipolar transistor crystal oscillator with the bias on the base of the transistor fixed and a second transistor coupled in parallel with the transistor of the oscillator for providing an alternate current path when the second transistor is conduc... | 09/21/1976 |
| 3981265 | Combined dial scale and station indicator A radio receiver and magnetic tape player combination having a radio control mechanism and a housing with an opening to receive a magnetic tape cartridge, includes a dial door and station indicator mounted in the housing and movable between a first positi... | 09/21/1976 |
| 3980824 | Modulator demodulator for binary digitally encoded messages In a communications system utilizing binary messages, a modulator for differentially modulating the messages, i.e. a change in the differentially encoded data is produced for every "one" in the data stream and no change occurs for every "zero" in the data... | 09/14/1976 |
| 3981017 | Center fed vertical gain antenna An improved gain antenna which is vertically mounted to a horizontal ground plane is disclosed. The gain antenna substantially consists of a radiating conductor having first and second ends and a centrally located feed point, and phasing apparatus electri... | 09/14/1976 |
| 3980952 | Dipole antenna system having conductive containers as radiators and a tubular matching coil A pager antenna system having two conductive containers which act as radiators and form a dipole antenna is disclosed. A metallic coil constructed of tubular material is positioned between the conductive containers and has a first end electrically connect... | 09/14/1976 |
| 3972062 | Mounting assemblies for a plurality of transistor integrated circuit chips A mounting assembly for a power transistor integrated circuit chip having a pair of electrodes on one surface thereof comprising base and emitter connections and a third electrode on the opposite surface thereof comprising the collector connection, is fab... | 07/27/1976 |
| 3972070 | Mode selector lockout mechanism for a cassette tape recorder/reproducer A mode selector mechanism for a magnetic tape recorder/reproducer device for use with a cassette and having a housing, a cassette receiving opening, a tape drive mechanism and a plurality of actuators including a play, a stop and a record actuator, which ... | 07/27/1976 |
| 3972073 | Automatic tape cartridge ejection mechanism for multitrack cartridge players When the ignition switch of the automobile is turned off, a solenoid in the tape player is de-energized and the release of its armature pulls a small resilient roller into contact with the tape drive capstan. The capstan forces the roller into a wedged po... | 07/27/1976 |
| 3972001 | Common mode rejection dynamic filter circuit In amplifying circuitry, such as video amplifiers and the like, a resistor is connected between the common junction thereof and ground and a transistor biased for linear operation is connected between the power receiving junctions and a power source with ... | 07/27/1976 |
| 3970801 | Dialing apparatus for a portable radio telephone This apparatus is especially useful as a conversion kit and includes a new front cover for a portable radio telephone having a plurality of push buttons mounted therein, which push buttons activate a tone generator, the tones from which are applied to a t... | 07/20/1976 |
| 3970818 | Method and apparatus for a thermistor compensated oven An oven having a thermistor controlled proportional heating system is compensated for ambient temperature variations by using a second thermistor sensing ambient temperature and connected in series with the control thermistor in an electrical bridge circu... | 07/20/1976 |
| 3970902 | Housing arrangement for miniaturized electronic devices An improved miniaturized housing arrangement is disclosed for releasably mounting a chassis, such as a printed circuit board, using the contours and the resiliency of the housing itself to retain and release the board. No special tools are required nor an... | 07/20/1976 |
| 3970937 | Modem for a suppressed carrier communications system A modem having a transmitter portion including a first modulator connected to receive audio frequency signals and supplying an output signal through a single sideband filter to a second modulator providing an output signal at a unique channel frequency, a... | 07/20/1976 |
| 3970966 | Crystal oscillator temperature compensating circuit A circuit for generating a temperature varying control voltage which is applied to a varactor diode to temperature compensate a crystal oscillator is disclosed. The circuit produces a substantially linear voltage versus temperature variation, including a ... | 07/20/1976 |
| 3970986 | Thick film rotary switch A housing having a central bore therein receives a rotor rotatably mounted therein and secured thereto having an enlarged round base portion. A thrust plate is mounted for limited axial reciprocation within a recessed opening in the housing concentric wit... | 07/20/1976 |
| 3971054 | Method and apparatus for magnetizing permanent magnet in magnetic structure The permanent magnet of a magnetic structure is formed of isotropic magnetic material, and is magnetized along the path that the flux follows during use of the magnetic structure to increase the efficiency of the magnetic structure in use. The magnetic st... | 07/20/1976 |
| 3970970 | Multiple acoustically coupled surface acoustic wave resonators A base of piezoelectrically active material having a plurality of spaced apart reflectors formed thereon and transducers positioned between at least some of said adjacent reflectors to produce standing waves at a predetermined frequency, the reflectors be... | 07/20/1976 |
| 3965449 | Treadle bar driven potentiometer A rotary wiper contact supported on a hub is housed between a substrate having a resistive element and a bracket means to form a potentiometer subassembly. The bracket and substrate are fixedly mounted to a pushbutton tuner frame with the hub of the wiper... | 06/22/1976 |
| 3965330 | Thermal printer head using resistor heater elements as switching devices A method and apparatus for a thermal printer head which uses individual heater elements as switching devices is disclosed. The printer head consists of an array of individual resistors each capable of causing a dot to print on thermally sensitive paper. T... | 06/22/1976 |
| 3964320 | Adaptable tuner assembly The assembly has a tuning control shaft which is adjustable over a range of positions to conform to a range of tuner designs. An adjustable guide bracket for the manual tuning pinion gear allows the pinion gear to be positioned along a radius of the crown... | 06/22/1976 |
| 3965370 | Pulse regenerating circuit A transistor switch having a square pulse with distorted leading and lagging edges and a distorted amplitude applied to the base thereof and the same pulse applied through two semiconductor junctions and a voltage divider to provide a voltage equal to the... | 06/22/1976 |
| 3965421 | Automatic master-slave carrier switching circuit A suppressed carrier, communications system including at least two spaced apart transceivers wherein a portion of the carrier is transmitted for synchronizing both transmitters and receivers, the apparatus including a carrier oscillator and filters for se... | 06/22/1976 |
| 3964001 | Anti backlash and treadle bar linkage system In a pushbutton type tuner assembly for a radio receiver the treadle bar drive gear, which is coupled to the manual tuning knob through the crown gear and the clutch mechanism, is biased into meshed relation with the treadle bar gear through a pair of lev... | 06/15/1976 |
| 3962923 | Force directed keyslide cam In the tuning mechanism of a pushbutton radio, pushbutton depression translates the actuating bar of a keyslide mechanism causing the opposing faces of a memory cam to forcibly engage and rotate a treadle bar assembly. The treadle bar assembly couples to ... | 06/15/1976 |
| 3962553 | Portable telephone system having a battery saver feature A battery saving system for a portable duplex communications system such as a portable telephone system includes a voice operated transmitter within each portable unit which automatically transmits radio signals upon application of audio signals thereto a... | 06/08/1976 |
