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| Number | Title | Issue Date |
| 8131213 | Sea vessel tagging apparatus and system The present invention discloses a tagging and identification device and system for tracking and monitoring sea vessels as they enter sea ports, estuaries and/or other channels. The tagging device of the present invention comprises a receiver, for receiving an underw... | 03/06/2012 |
| 8055193 | Underwater remote sensing An underwater remote sensing system comprising a transmitter for transmitting an electromagnetic signal, a receiver for receiving an electromagnetic signal reflected from an object and determining means for determining the location of the object, wherein at least on... | 11/08/2011 |
| 8045919 | Electromagnetic/acoustic underwater communications system An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data ont... | 10/25/2011 |
| 8005424 | Communication device and communication method of underwater vehicle The present invention provides a communication device and a communication method of an underwater vehicle, which use an electromagnetic field (electromagnetic wave), having a higher propagation speed than that of an acoustic wave, for communication between an underw... | 08/23/2011 |
| 7877059 | Underwater communications system comprising relay transceiver An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data ont... | 01/25/2011 |
| 7873316 | Underwater communications system An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data ont... | 01/18/2011 |
| 7853206 | Underwater communications system with adaptable carrier frequency An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data ont... | 12/14/2010 |
| 7831205 | Methods and systems for wireless communication by magnetic induction Disclosed are embodiments of methods and systems for wireless data transmission by magnetic induction. In one embodiment, a network of magnetic induction units is provided. The units may be configured to transmit a data signal by modulation of a time-varying magneti... | 11/09/2010 |
| 7826794 | Distributed underwater electromagnetic communication system An extended underwater electromagnetic transducer is provided with an electrically insulated transmission line typically connected to a transmitter or receiver or transceiver system. The transmission line allows near-field communications with another transmitter or ... | 11/02/2010 |
| 7796943 | Sub-surface communications system and method A communications system including: a plurality of sub-surface portable transceivers each including: a digital data source, a modulator coupled to the digital data source, a power amplifier coupled to the modulator and a loop antenna inductively coupled to the power ... | 09/14/2010 |
| 7769632 | System for selectively communicating promotional information to a person A system for selectively communicating promotional information to a person, includes a sensing system, a storage device, a controller, and a projection device. The sensing system measures a detectable feature associated with the person sensed by the sensing system a... | 08/03/2010 |
| 7711322 | Underwater communications system and method An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data ont... | 05/04/2010 |
| 7373657 | Method and apparatus for controlling data and software access A proximity based computer access system is provided. According to the invention, a local key associated with a workstation wirelessly communicates with a local key which is associated with a user. If the user, and remote key, are outside of a preset radius of the w... | 05/13/2008 |
| 7366150 | Indoor local area network system using ultra wide-band communication system An indoor local area network (LAN) system using an ultra wide-band (UWB) communication system is provided. The indoor LAN system includes at least one remote terminal including a UWB module for converting input digital data to be transmitted into an analog signal of... | 04/29/2008 |
| 7324053 | Recording/playback apparatus with electric wave transmission A recording/playback apparatus accommodates a recording medium in a cassette shell and performs recording and/or playback with respect to the recording medium cassette provided with a cassette-side antenna connected to an in-cassette memory. The playback apparatus i... | 01/29/2008 |
| 7324615 | Time signal receiver and decoder A time signal receiver and decoder receives, detects and stores time information from time signals, e.g., WWV, WWVH, WWVB (USA), JJY (Japan), MSF (UK) and the like. The time information may be used for a self setting clock, and the clock may be used as a reference i... | 01/29/2008 |
| 7293715 | Marking system and method A marking system and method for a well site sample is provided. The system includes a container for collecting the well site sample, a marker applied to the container and a scanner adapted to read the marker. Data may be uploaded to and/or downloaded from the marker... | 11/13/2007 |
| 7283061 | Method and system for performing operations and for improving production in wells A method for performing operations and for improving production in a well includes the steps of: providing radio identification devices at known locations in the well, and providing a reader device configured to read the identification devices, and to control the op... | 10/16/2007 |
| 7258836 | Freeze resistant buoy system A freeze resistant buoy system includes a tail-tube buoy having a thermally insulated section disposed predominantly above a waterline, and a thermo-siphon disposed predominantly below the waterline. ... | 08/21/2007 |
| 7245186 | Bandpass amplifier The present invention discloses a bandpass amplifier having gain and bandpass performance. The bandpass amplifier includes an input match unit for matching the gain of the amplifier and having a first filter response; a first bias unit electrically connected to the ... | 07/17/2007 |
| 7221908 | Radio communication apparatus A communication apparatus operating under a back scattering system involving processes of QPSK modulation is provided. The apparatus includes: a first signal channel for acquiring a first reflected wave by getting an incoming radio wave directly reflected without wa... | 05/22/2007 |
| 7174150 | Method for processing information associated with disaster An object of this invention is to make it possible to confirm the safety of persons who have the possibility of encountering the damage of the disaster when the disaster occurred. This system receives information of the disaster occurring region A and information of... | 02/06/2007 |
| 7149472 | Through-the-earth radio A through-the-earth communication system that includes a digital signal input device; a transmitter operating at a predetermined frequency sufficiently low to effectively penetrate useful distances through-the earth; a data compression circuit that is connected to a... | 12/12/2006 |
| 7132881 | Active filter In order to reduce capacitance of a feedback section of an operational amplifier provided in a semiconductor integrated device, an active filter includes an operational amplifier in which a plurality of capacitive elements are connected between (i) an output termina... | 11/07/2006 |
| 7050831 | Through-the-earth communication system A method and system for communication within an energy-transmission-limited environment. RF transceivers throughout the site are located site-wide such that areas within the site in which communications are desired are within range of at least one of the RF transcei... | 05/23/2006 |
| 7043195 | Communications system A communications system, including at least one base station (8) at the surface, at least one repeater station (6) below the surface, and at least one mobile station (4) below the surface, the stations (4, 6, 8) establishing a bidirection... | 05/09/2006 |
| 7043204 | Through-the-earth radio A method and apparatus for effective through-the-earth communication involves a signal input device connected to a transmitter operating at a predetermined frequency sufficiently low to effectively penetrate useful distances through-the earth, and having an analog t... | 05/09/2006 |
| 7037153 | Surfboard shark repellent system A surfboard shark repellent system for repelling sharks away from an individual while surfing. The surfboard shark repellent system includes an attachable magnet and a transmitter unit that emits sound waves at a frequency undesirable to sharks. The transmitter unit... | 05/02/2006 |
| 7023338 | Apparatus, systems and methods for aquatic sports communications The exemplary embodiment of the present invention integrates a two-way communications device into a personal floatation device (“PFD”; sometimes also referred to herein as a “life vest”). Integration of the two-way communications device in the exemplary PFD ... | 04/04/2006 |
| 7023833 | Baseband wireless network for isochronous communication A wireless communication network system apparatus which provides for isochronous data transfer between node devices of the network, which provides at least one master node device which manages the data transmission between the other node devices of the network, whic... | 04/04/2006 |
| 7013257 | Communication transmission impairment emulator A communication system emulator digitally emulates a plurality of signal impairments created by the transmitter and receiver components and communication medium in a typical communication system, for use in evaluating and refining modem design. A variety of linear a... | 03/14/2006 |
| 6993432 | System and method for wellbore communication A method and system is disclosed for communicating information from a downhole location to the surface including a plurality of releasable vessels containing predetermined signal information affixed to the vessels prior to placement of the vessels downhole and indic... | 01/31/2006 |
| 6935425 | Method for utilizing microflowable devices for pipeline inspections Microflowable devices can be used in pipelines to perform inspections. Disclosed are methods of using microflowable devices to measure parameters of interest within a pipeline to inspect the pipeline for conditions such as stress, corrosion, wall erosion and the lik... | 08/30/2005 |
| 6766141 | Remote down-hole well telemetry The present invention includes an apparatus and method for telemetry communication with oil-well monitoring and recording instruments located in the vicinity of the bottom of gas or oil recovery pipes. Such instruments are currently monitored using electrical cablin... | 07/20/2004 |
| 6272349 | Integrated global positioning system receiver A GPS receiver (1) has an antenna (3) mounted directly on a first side (4) of a multilayer printed circuit board (PCB) substrate 2. Electrical conductors interconnect the antenna (3) with an RF processing system (11,12) and a digital processing system (10... | 08/07/2001 |
| 6266019 | System for increasing antenna efficiency A communications device having an antenna and a housing having a front section and a rear section, one of the front section and the rear section being conductive. A circuit board is mounted within the housing and includes a point of lowest potential and a... | 07/24/2001 |
| 6263189 | Narrowband high temperature superconducting receiver for low frequency radio waves An underground communicating device has a low-noise SQUID using high temperature superconductor components connected to detect a modulated external magnetic flux for outputting a voltage signal spectrum that is related to the varying magnetic flux. A narr... | 07/17/2001 |
| 6085111 | Telephone and device intended to be adapted to said telephone when operating in restricted mode The invention relates to a telephone comprising a keyboard which has keys to which various functions are assigned. According to the invention, the operation of certain keys is admitting of being blocked, and the function assigned to the non-blocked keys i... | 07/04/2000 |
| 5991602 | Method of and system for communication between points along a fluid flow A method of communicating data between points along a fluid flow includes providing a plurality of remotely writable and readable data storage units capable of flowing in the fluid flow; remotely writing data to the data storage units as they pass a first... | 11/23/1999 |
| 5794126 | Emergency positioning indicating radio buoy having a thermally insulated frequency standard An emergency positioning indication radio buoy used in case of emergency by being thrown into the sea from a ship. This radio buoy comprises a transmitting unit for generating a high frequency signal of a predetermined frequency, a battery for supplying t... | 08/11/1998 |
