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| Number | Title | Issue Date |
| 4215349 | Remote control system for an electrical apparatus A remote control system for operating an electrical apparatus has a transmitter for transmitting binary coded commands to a receiver which in turn controls the operation of the electrical apparatus. The apparatus is activated by the receiver in accordance... | 07/29/1980 |
| 4207524 | Radio coupled device for detecting and analyzing weak transmissions A signalling device employing radio frequencies in which the transmitter produces a weak, or relatively weak, encoded transmission within a crowded frequency band and an associated receiver which includes a processor capable of detecting and analyzing the... | 06/10/1980 |
| 4206411 | Radio controlled model aircraft control system A method and apparatus are disclosed for the emergency control of model aircraft. The incoming signals to the model are screened and, if missing or outside acceptable limits, the screened signals are replaced with a sequence of preprogrammed emergency sig... | 06/03/1980 |
| 4200862 | Appliance control An applicance control system comprises a data transmitter and plurality of slave units plugged into outlet sockets of a power main of a building, appliances being coupled to the slave units. The transmitter housing includes a data input arrangement by whi... | 04/29/1980 |
| 4197497 | Automatic police emergency locator system All messages broadcast through a two-way radio by a police officer from his vehicle, are recorded on an endless tape loop of a playback recorder. An alerting signal generated by a pretuned oscillator is simultaneously recorded on the tape with each messag... | 04/08/1980 |
| 4178549 | Recognition of a received signal as being from a particular transmitter A system for recognizing a received encoded signal as being from a particular transmitter is disclosed. An encoder encodes a signal to have a predetermined sequence of pulses of three different predetermined sequence of pulses of three different predeterm... | 12/11/1979 |
| 4177426 | Radio control system with pluggable modules for changing system operating frequency A radio control system for controlling model airplanes, model boats and the like. The system includes a multi-channel transmitter and a multi-channel receiver each operative on the same assigned radio control frequency. The system operating frequency is c... | 12/04/1979 |
| 4172969 | Real time absentee telephone and radiant wave signaling system A fully automatic communication system employing an automatic telephone answering device and a mobile radio transmitter and receiver for enabling a party calling another on the telephone to communicate to the mobile location of the other in "real time" th... | 10/30/1979 |
| 4168468 | Radio motor control system A radio control system having a radio-controlled model toy on which a d-c power supply, a receiver and two electric motors are mounted, and a transmitter for maneuvering the radio-controlled model toy, and characterized in that the transmitter is construc... | 09/18/1979 |
| 4163218 | Electronic multiple device control system An electronic control system which can control the operation of a number of electrical devices such as lights, outlets, sensing apparatus, etc., all of which are energized from the same power lines. Each of the electrical devices is respectively connected... | 07/31/1979 |
| 4162486 | Encoded electrical control systems Encoded electrical control systems for household applications each employ an encoder/transmitter that provides an encoded signal and a receiver/decoder which effectuates control of an associated device only upon receipt of a signal containing the code uni... | 07/24/1979 |
| 4158812 | Radio transmitter with intermixed controls A radio control system having a plurality of individually adjustable manual controls for individually signaling the position to be assumed by each of a plurality of remotely located servo units and in which one manual control is interconnected to alter a ... | 06/19/1979 |
| 4143307 | Motor speed control circuit apparatus A pulse width modulated DC motor speed control circuit for models including a demodulator for receiving an input pulse having a width which may vary from a reference width, and for generating a first positive output pulse having a width proportional to th... | 03/06/1979 |
| 4141010 | Digital encoder for door operator A digital radio control system comprising a transmitter for producing a repeating series of width modulated pulses, and a receiver responsive only to a series of predetermined pulse characters to actuate a load device such as a garage door operator. Both ... | 02/20/1979 |
| 4139170 | Command control system 10. A method for use in controlling the travel of a vehicle comprising the steps of first deriving two narrow band noise signals of different frequencies, then delaying one of said signals by an amount which constitutes the information which will control ... | 02/13/1979 |
| 4104694 | Asynchronous digital locking system An asynchronous digital electronic combination locking system including a hand-held transmitter means for providing timed and coded transmission data, and a receiver for providing timed and coded receiver data and comparing the receiver data with the inco... | 08/01/1978 |
| 4104638 | Cooperative type anti-collision radio system A cooperative type aircraft anti-collision radio system utilizes radio transmitters and receivers transmitting and receiving on a single radio frequency common to most aircraft having radio systems or on multiple radio frequencies if desired. Each aircraf... | 08/01/1978 |
| 4102521 | System for signal coding 1. In a system for the coding of guidance signals which are produced at a control center and after their coding transmitted to a body to be guided, a control center consisting of a command generator for producing the guidance signals, a coding unit for co... | 07/25/1978 |
| 4102394 | Control unit for oil wells A control unit for oil wells for maximizing the efficiency of a producing oil well field, including the use of a variable speed AC motor powering each oil well pump jack, which enables the operator to control the strokes per minute on the pump unit and ad... | 07/25/1978 |
| 4101886 | Apparatus for conserving energy in electrical appliances An apparatus for connecting and disconnecting appliances to an electrical supply, responsive to door activated switch means. A transmitter responds to entrance into a room by causing a receiver to activate a connecting means supplying an appliance with el... | 07/18/1978 |
| 4093953 | Control stick assembly for radio control equipment A movable control stick is urged by springs toward a neutral position. A radio signal generated responsive to displacement of the control stick is transmitted to a remote element to be controlled. The remote element is displaced responsive to the radio si... | 06/06/1978 |
| 4072898 | Remote control radio system A system for individually adjusting a plurality of remotely located servo units according to the position of a manual control for each servo unit by transmitting a carrier wave that is switched on and off for division into repeating sequences with each se... | 02/07/1978 |
| 4048630 | Door operator with automatic control of auxiliary circuit A door operator is disclosed which has a motor connected to open and close a door; for example, a garage door and a lamp is provided to illuminate the interior of the garage. Motor and lamp energization circuits are provided as controlled by switches; for... | 09/13/1977 |
| 4045777 | Remote control transmitter and receiver for use with a television receiver A remote control transmitter and receiver for controlling all of the usual viewer-adjustable functions of a television receiver. A plurality of key/switches permit the viewer to select the channel to be tuned and the function to be controlled. Digital log... | 08/30/1977 |
| 4038590 | Pulse code modulation radio control system A pulse code modulation communication system adapted in a preferred embodiment to the remote control of a flying model aircraft. The positions of the various control sticks are represented by a digital code which is multiplexed and then transmitted via pu... | 07/26/1977 |
| 4024474 | Circuit arrangement for wireless transmission of a control signal to the control path or a controllable semiconductor valve, in particular a thyristor A circuit arrangement for the wireless transmission of a control signal to the control path of a controllable semiconductor valve, in particular a thyristor, is disclosed. The arrangement comprises a high-frequency transmitter in which a high frequency ca... | 05/17/1977 |
| 4023178 | Radio-controlled vehicle with RF noise elimination feature and with ultrasonic anti-collision means insensitive to mechanical shocks A radio-controlled vehicle having a steering motor, a drive motor, a drive mechanism, and a direction sensor for receiving an RF signal from a remote station to actuate the drive motor and to control the steering motor to direct the vehicle to the station... | 05/10/1977 |
| 4007455 | Energy conserving pulse keying technique for a radio control system In a radio control system of the digital proportional control type in which a control signal whose period comprises a plurality of control pulses and a timing pulse is transmitted to control servomechanisms in response to the time width of each control pu... | 02/08/1977 |
| 3987447 | Missile command link with pulse deletion command coding A command data link between an aircraft and a missile having a high invulability to jamming by providing a communications system in which the missile receiver is normally off and is gated on only during a short time during which a signal is supposed to a... | 10/19/1976 |
| 3971028 | Remote light control system A remote light control for homes, offices or factories consists of a radio transmitter which may be carried on the person or in an automobile and a coacting radio receiver which may be installed permanently as a part of the building wiring, or as a portab... | 07/20/1976 |
| 3964046 | Control device for a portable machine A control device repeatedly starts operation of a portable machine by detecting the movement of a hand on a watch mechanism and producing a first start signal to start operation of one portion of the portable machine. A delay arrangement then produces a s... | 06/15/1976 |
| 3936616 | "Wild" mobile disable circuit A circuit for disabling, or shutting down, the transmitter of a mobile telephone unit when the unit is not connected to another party is disclosed. When such a "wild" mobile is sensed, a sequence of idle and seize audio tones are sent and transitions ther... | 02/03/1976 |
