Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 8188855 | System, device and method for communicating over power lines A system, method and device for communicating over a power line are provided. In one embodiment, the device includes a controller, a first port in communication with the controller and configured to communicate over a power line via any of a plurality of frequency b... | 05/29/2012 |
| 8130084 | Fault tolerant closed system control using power line communication A method, system, and computer program product are provided for communicating to a powered element in a rack system. A controller injects communication data onto power lines that provides power to a plurality of powered elements. The powered elements determine if th... | 03/06/2012 |
| 8018331 | Multilevel inverter using cascade configuration and control method thereof A multilevel inverter using a cascade configuration with a device for equally controlling a power factor for each unit cell includes: a master controller, a plurality of power cells connected in series for each of three AC (Alternating Current) phases, a phase shift... | 09/13/2011 |
| 7898406 | Powered device with priority indicator A method for communicating settable priority data from a powered device being powered over communication cabling to power sourcing equipment, the method comprising: prior to connecting power to operational circuitry of the powered device, transmitting first multi-bi... | 03/01/2011 |
| 7791468 | Power line communication system having time server A system for bi-directional power distribution line communication. The system is configured for data communication with an endpoint transceiver located at a customer premise. The system comprises a time server in electrical communication with the transceiver, the ti... | 09/07/2010 |
| 7382232 | Power line communications device and method of use A device and method for providing power line communications via an underground residential distribution power system is provided. One embodiment of the present invention includes a power line bridge having though section and processing section. The through section m... | 06/03/2008 |
| 7366773 | Alternative communications paths for data sent over power line carrier Extensions to the concept of using a power line carrier to convey a data record from the secondary side of a first transformer to a receiver in a power distribution substation include receiving the data record over a secondary data path in the event that the primary... | 04/29/2008 |
| 7327222 | Transmission system for transmitting data via current conducting branches A system and method for transmitting and receiving data between a power supply and a remotely located load, by use of standard data communication cable has functional data transmitted via the power line of such data communication cable in order to decrease the numbe... | 02/05/2008 |
| 7319384 | Communication apparatus and communication method A communication apparatus includes a transmission signal generation section 1, a transmission signal control section 2, a transmission section 3, a leakage electric power detection section 4, and an electric power control judgment section... | 01/15/2008 |
| 7317404 | Method and apparatus for collecting and displaying consumption data from a meter reading system A method and an apparatus for collecting and displaying real-time utility consumption data and an estimate of utility costs from various utility metering modules upon request by the consumer within the comfort of their own home or business. According to one aspect o... | 01/08/2008 |
| 7304567 | Method and apparatus for communicating control and other information over a power bus An information signal to be communicated to a roof-mounted light bar or other electrical or electronic device travels over the vehicle's or other environment's power bus or other power conductor. In one exemplary illustrative non-limiting implementation, a modulated... | 12/04/2007 |
| 7301738 | Method and apparatus for minimally invasive network monitoring A method and apparatus for monitoring a communication network is provided. The network includes a plurality of node electronics units communicatively coupled to at least one central control processing unit through at least one network wherein each network includes a... | 11/27/2007 |
| 7271597 | Electronic device, transmission system, and method for determining connection condition An electronic device has a first signal path, a first power supply path, and a connector that transmits to an external device the input signal on which the voltage has been superposed. The device also has a first power supply switch inserted into the first power sup... | 09/18/2007 |
| 7269215 | Equalization processing method and the apparatus for periodic fluctuation of transmission line characteristic A method used in equalization processing is provided, in which a reference signal is received and a change point of transmission line characteristics is detected. A basic frequency signal of fluctuation period of the transmission line characteristics is extracted, a... | 09/11/2007 |
| 7263110 | Synchronizing clock signals of server and client devices in a network system based on power source synchronous pulse signal In a network system, clock signals of a server device and a client device are synchronized with each other without having any influence of a change and a delay of the transmission time of data. Therefore, in the network system in which the client device receives and... | 08/28/2007 |
| 7248178 | RF communication with downhole equipment Data or control signals are communicated over a three phase power cable supplying power from a surface location to a motor/pump assembly located within a wellbore utilizing modulated radio frequency signals. The radio frequency signals may be impressed on the power ... | 07/24/2007 |
| 7233912 | Method and apparatus for vending a combination of products A method and apparatus for delivering a plurality of products from a vending machine is disclosed. The method generally allows an offer for a package to be output, in which the package defines a plurality of products, including a selected product. An apparatus is al... | 06/19/2007 |
| 7215245 | Activator circuit responsive to power line disturbances An activator circuit responsive to power line disturbances. In condition of false alarm, the user will toggle a local light switch causing electrical disturbances on the power line. The activator circuit detects these disturbances and activates an output, which is f... | 05/08/2007 |
| 7199706 | PLC intercom/monitor A digital intercom device consistent with certain embodiments uses power line communication (PLC). A power line interface connects to a power line serving as a communication medium. An audio codec is coupled to the power line interface for encoding and decoding digi... | 04/03/2007 |
| 7187276 | Power line communication system and method of using the same The fiber optic isolator of the present invention transports data signals between high voltage power lines and a communications interface device, bypassing a step down transformer to low voltage power. The communication interface device includes a low voltage power ... | 03/06/2007 |
| 7180412 | Power line communication system having time server A system for bi-directional power distribution line communication. The system is configured for data communication with an endpoint transceiver located at a customer premise. The system comprises a time server in electrical communication with the transceiver, the ti... | 02/20/2007 |
| 7170394 | Remote current sensing and communication over single pair of power feed wires Disclosed is a novel technique for transferring power and signals between two electrical devices over a single wire pair. In particular, a remote sensor is connected to a host device. Power to the remote sensor is supplied through a voltage reference and control loo... | 01/30/2007 |
| 7170405 | Method and apparatus for interfacing a power line carrier and an appliance A method and apparatus for communicating between an appliance and a power line carrier communication system includes at least one power line carrier connection, at least one appliance connection, and processing circuitry for translating between an appliance communic... | 01/30/2007 |
| 7158042 | Voltage regulator for physically remote loads The invention relates to a voltage regulator for physically remote loads (2) with an adjustable power supply (9) for the load (2), with a measurement device (11, 12) assigned to the load (2) for creating a digital measurement signa... | 01/02/2007 |
| 7154381 | System and method for operating a sensed power device over data wiring According to the present invention, a power source delivers power to a networked device over network cabling (e.g., Ethernet cabling) in one of two modes: a low power mode and a high power mode. The power source begins delivering power at a low power level in the lo... | 12/26/2006 |
| 7129820 | Door station apparatus with electric lock The respective sections between a power source unit 4 and a room master station 1, between the room master station 1 and an entrance door station 2, and between the entrance door station 2 and an electric lock 3 are connecte... | 10/31/2006 |
| 7123140 | Network for remote administration of street lighting inter alia and methods to carry out said administration A wireless network for remotely controlling at least one lamp includes a first radio transceiver associated with the at least one lamp and a second radio transceiver. The first radio transceiver further includes a circuit for controlling the at least one lamp as a f... | 10/17/2006 |
| 7088232 | System and method for reducing radiation when distributing broadband communication signals over power lines A system for decreasing high frequency (HF) radiation emission in a power line comprises a first transmitter configured to transmit a utility power signal over the power line. A second transmitter transmits a high frequency communication signal over the power line s... | 08/08/2006 |
| 7053765 | Active security system A system and method is disclosed for actively maintaining security of a premises. The method can include the operation of establishing a data link between a local security controller within the premises and a monitoring station located remote from the premises. A se... | 05/30/2006 |
| 7030761 | Multi-resolution object location system and method A multi-resolution object location system and method for locating objects is provided. The multi-resolution system and method uses a long-range object locator together with a more precise RFID locator to efficiently and accurately determine the location of objects t... | 04/18/2006 |
| 7026947 | Building emergency path finding systems and method Signals from a plurality of detectors are evaluated to establish an ingress or an egress path or paths to and from a region. Where the detectors indicate flame or smoke concentrations, the ingress paths lead first responders to the source of the flame or smoke while... | 04/11/2006 |
| 4835516 | Arrangement for introducing audio-frequency signals into a power supply line An arrangement for introducing audio-frequency signals into a power supply line containing a compensating capacitor, through a junction converter having primary winding which is connected with an audio-frequency signal generator. The secondary winding of ... | 05/30/1989 |
| 4829570 | Wireless remote speaker system A device comprised of separate transmitter and receiver sections, which converts an audio signal into an F.M. signal, transmits the F.M. signal over A.C. power lines, and reconverts the F.M. signal into an audio signal, which can then be outputted to loud... | 05/09/1989 |
| 4788527 | Apparatus and method for device control using a two conductor power line In a system in which a power supply provides power to a plurality of remote devices and sensoring devices, apparatus for applying an initial control signal to the power source lines activates a clock/logic network associated with each group of remote sens... | 11/29/1988 |
| 4785195 | Power line communication An improved signaling system for command and information signaling over a power system interconnection comprising the utilization of pseudo-random binary pulse code with frequency modulation to overcome the extraordinarily high noise ambient while providi... | 11/15/1988 |
| 4782322 | Amplitude modulation of control signals over electrical power lines utilizing the response of tuning fork filters An electrical signalling apparatus including a transmitter and receiver connected to the same electrical power distribution network wherein a signal generated by the transmitter is used to control apparatus connected to the receiver. The system uses a pai... | 11/01/1988 |
| 4751495 | Analog pulsed heat trace monitor or the like A system, utilizing an analog pulsed signal, is for monitoring the condition of a system, by way of illustration, a multi-circuit electrically heat-traced substrate. The system senses the temperature of the substrate at the end of a heat traced circuit, c... | 06/14/1988 |
| 4737769 | Fire detection alarm system An alarm system utilizing existing electrical wiring in conjunction with an alarm box. An alarm signal is manually or automatically generated and is converted to an RF signal which is conducted over the existing electrical wiring to an alarm box. The RF s... | 04/12/1988 |
| 4737657 | Interrogator system for identifying electrical circuits A system for interrogating electrical leads to correctly ascertain the identity of equipment attached to remote ends of the leads. The system includes a source of a carrier signal generated in a controller/receiver to be sent over the leads and an identif... | 04/12/1988 |
| 4714912 | Single-conductor power line communications system A power line communications (PLC) system utilizes a single conductor of a multiple-conductor power-transmission circuit, for carrying signal current, injected by at least one transmitter in series with that single conductor, to at least one receiver also ... | 12/22/1987 |
