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| Number | Title | Issue Date |
| 7187229 | Active filter for reduction of common mode current An active filter for reducing the common mode current in a pulse width modulated drive circuit driving a load, said drive circuit comprising an a-c source, a rectifier connected to said a-c source and producing a rectified output voltage connected to a positive d-c ... | 03/06/2007 |
| 7127533 | Interrupt driven expanded option select interface for portable device A peripheral component (104) is attached to a portable electronic device (102), and indicates an option class of the peripheral component by use of an option select circuit. The option select circuit causes an interrupt to be generated in the portable ... | 10/24/2006 |
| 7091687 | Electrical system for controlling at least one gate or door or similar element of the type moved electrically An electrical system for controlling at least one gate or door or similar element of the type moved by means of at least one corresponding electric motor includes an electric network (NTWRK) consisting of two electric wires adapted to allow the distribution of direc... | 08/15/2006 |
| 7093054 | Method of transferring signals between a TTL microcontroller and a RS232 device A switching transistor is placed between a serial port of a RS232 device and a parallel port of a TTL microcontroller. Selective activation of the switching transistor permits a high voltage signal to be transmitted from the power supply rail of the TTL microcontrol... | 08/15/2006 |
| 7057496 | Multiplex bus interface system and method for transmitting and receiving power and data A multiplex bus interface enables power and data to be transmitted and received on a two wire bus. Input and output devices operate with transceivers connected to the bus to communicate with each other by placing their data on the bus within specific time slots cont... | 06/06/2006 |
| 7046126 | Vehicle window control system for a vehicle having a data communications bus and associated methods A vehicle window control system for a vehicle having a data communications bus may include at least one vehicle device associated with operating a window of the vehicle, a window operation transmitter, a receiver at the vehicle for receiving signals from the window ... | 05/16/2006 |
| 6756881 | Multiplex bus interface system and method for transmitting and receiving power and data A multiplex bus interface enables power and data to be transmitted and received on a two wire bus. Input and output devices operate with transceivers connected to the bus to communicate with each other by placing their data on the bus within specific time slots cont... | 06/29/2004 |
| 6288652 | Digitally encoded keyless entry keypad switch A five-switch keypad apparatus having four diodes that multiplex the switch contacts onto three sense terminals. The three sense terminals create a binary code that defines eight possible switch states. The eight states are used to indicate each individua... | 09/11/2001 |
| 6008733 | Air conditioning system master/slave control unit determination A plurality of air conditioning system control units are connected to each other through a communication line (20). Discharge resistors (R1, R2) are provided for discharging residual charges of the communication line (20). The control unit has a power sup... | 12/28/1999 |
| 5661754 | Receiver arrangement An infrared remote-control receiver employs at its front end a gyrator-configured transistor operating as a current-to-voltage converter, but derives its data information from a negative-going gyrator output pulse in preference to the more conventionally ... | 08/26/1997 |
| 5400017 | Transmission apparatus A transmission device is disclosed wherein a plurality of control units each having a transmitting/receiving block connected to one another through a positive signal line and a negative signal line, and bidirectional signal transmission is carried out wit... | 03/21/1995 |
| 5339073 | Access control equipment and method for using the same Access control equipment includes an interrogation unit which emits an interrogation signal, and a plurality of transponders, each transponder having a stored identity code different from that of the other transponders. This identity code includes a plura... | 08/16/1994 |
| 5210846 | One-wire bus architecture A system architecture which provides efficient data communication, over a one-wire bus, with a portable data module which does not necessarily include any accurate time delay circuit whatsoever. The time delay circuit in the module can be extremely crude.... | 05/11/1993 |
| 5210531 | Monitoring and control system with binary addressing A network of addressable modules is disclosed with each module being addressable by a particular multi-digit binary code and each having first and second normally high address input lines which go low only when all the address code digital positions corre... | 05/11/1993 |
| 5194858 | Lighting control system with set/reset ground remote A lighting load can be turned on/off manually from one or more remote switching stations as well as from a master switch controller station, with ON/OFF control signals produced at the remote switching stations being transmitted to the master controller c... | 03/16/1993 |
| 5049729 | Coded key system using pulse polarity A contactless coded key system, comprising a key 2 and key terminal each housing circuitry enabling information to be transferred from terminal to key, and vice versa, and enabling the key to be powered from the terminal. This circuitry also comprises a l... | 09/17/1991 |
| 5043723 | Memory remote control device A memory remote control device which comprises a wave shaping circuit for shaping a received remote-controlled signal and for outputting a pulse signal and an envelope signal, and a microcomputer operable to convert the remote-controlled signal into data ... | 08/27/1991 |
| 4779071 | System for transmitting commands A system is described for transmitting a plurality of commands to peripheral means, particularly to motor-driven transport means and principally to automatic carriages on rails for the overhead conveyance of material, which provides a main station that ge... | 10/18/1988 |
| 4725836 | Series port connection of a plurality of terminals to a master processor A circuit arrangement for connecting a plurality of digitally operated terminals to a single communications circuit of a master digital processing unit, such as a central computer, for transmission of information therebetween. The circuit comprises a firs... | 02/16/1988 |
| 4709233 | Single line pair power control system with multi-station capability A single line pair power control system is disclosed and consists of a reflex module supplying direct current of a first or a second polarity to the control line pair. The polarity of the reflex module reverses in response to a drop in the voltage between... | 11/24/1987 |
| 4628308 | Communication network having a master-slave type series architecture and providing master-to-slave and slave-to-master communication A network having a series architecture and comprising an electronic master device (M) and a plurality of electronic slave devices (E1, E2, . . . ). Each electronic slave device is provided with an associated connection device (30) wh... | 12/09/1986 |
| 4614840 | Telecommunication line circuit and associated polarity reversal circuit The present invention relates to a telecommunication line circuit including at least one line amplifier whose output is coupled to a telecommunication line conductor, and DC biasing means associated with said amplifier to apply thereto a DC bias signal of... | 09/30/1986 |
| 4608562 | Address personalization of a remotely attached device In a data transmission system comprising of a transmitting unit, a plurality of remote devices, and one or more serial communication links interconnecting the devices to the transmitting unit the polarities of a serially transmitted test signal and a loca... | 08/26/1986 |
| 4604619 | Apparatus and method for multiple mode remote control switching A remote controlled switching apparatus for controlling the operation of a device having a plurality of modes of operation. In the apparatus there is provided a first switch assembly responsive to a positive potential for causing the apparatus to operate ... | 08/05/1986 |
| 4583091 | Serial signal transmission system In a serial signal transmission system for transmitting data signals in a serial manner from a transmitting part to a receiving part of the system, both supplied power from a common power source, are provided a signal line extended between the two parts, ... | 04/15/1986 |
| 4567482 | Bypass control for stations in a communication system A communication system wherein a plurality of remote stations are serially connected in a communication loop to a Control Station. Communication of intelligence to and from the remote stations and to and from the Control Station is by way of high frequenc... | 01/28/1986 |
| 4502040 | Keyboard having keys activated by electrical contacts and the capacity to read one state from among four possible states A keyboard having keys activated by electrical contacts and the capacity to read one state from among four possible states, wherein the keyboard is a dipole disposed between two terminals between which are positioned in parallel three connectors, each inc... | 02/26/1985 |
| 4425564 | Multiplex wiring system for motor vehicles A multiplex wiring system including a plurality of data line (n) from which (n2 -n) load devices may be either independently or simultaneously energized. The system includes a synchronizing unit for applying an enabling voltage to each data lin... | 01/10/1984 |
| 4350979 | System and method for well-logging An improved system and method is provided for obtaining information related to subsurface earth formations. Well-logging data from an input terminal is processed and stored in a memory by a first processor. A second processor retrieves this data from the ... | 09/21/1982 |
| 4180804 | Remote control device for an amplifier trap circuit An FM trap circuit in an amplifier mounted on a roof top antenna is made operable from inside the home by providing a switch on the amplifier which is responsive to the negative half cycle in an A.C. power signal to disable the trap circuit and a switch i... | 12/25/1979 |
| 4153848 | Receiver circuit A receiver circuit for receiving a double current pulse signal from a transmission line and delivering positive pulse or a negative pulse corresponding to that of the double current pulse signal in a discriminating manner. The circuit comprises an input t... | 05/08/1979 |
| 4131839 | System for multistation remote position indication and control A system is provided for multistation remote position indication for remotely controlling and indicating the position of a motor driven positioning system, particularly an antenna rotor, at multiple locations utilizing a single pair of control wires to in... | 12/26/1978 |
| 3964023 | Method of and apparatus for selectively controlling a plurality of remotely located loads A master controller is connected via a pair of wires to a plurality of loads and is capable of generating pulses having either positive or negative polarity and a voltage level either above a first threshold or below a second threshold or above the second... | 06/15/1976 |
