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| Number | Title | Issue Date |
| 7787525 | Method and apparatus for transmission of well-bore data on multiple carrier frequencies A wireline telemetry system and method of transmitting data on multiple carrier frequencies. The system and method adjust power level and number of bits-per-carrier to optimally or near-optimally utilize the capacity of the wireline cable. Due to the nature of wirel... | 08/31/2010 |
| 7746921 | Resonant digital data transmission Power savings are achieved for digital data transport over short distances by using the characteristics of resonant LC circuits. Economy of circuit elements is achieved by enabling a single pair of resonant circuits to drive large numbers of digital data lines or no... | 06/29/2010 |
| 7392028 | Radio receiver/transceiver including an interface circuit selectively operable in a current mode or a voltage mode A radio receiver is selectively operable in a current mode or a voltage mode according to conditions prevailing within a wireless environment. If the signal levels within the wireless environment are relatively low, the radio receiver is operable in current mode. If... | 06/24/2008 |
| 7245656 | Method of signal acquisition and mobile station using the method Briefly, one way to minimize time and frequency uncertainties when synchronizing between a transmitter and a receiver is to use a position determining method such as global positioning system (GPS) to determine position and velocity. If position can be determined th... | 07/17/2007 |
| 7210383 | Detection system for power equipment Woodworking machines including conductive cutters adapted to cut workpieces, and motors adapted to drive the cutters are disclosed. The machines also include a contact detection system adapted to detect contact between a person and the cutter, and to distinguish con... | 05/01/2007 |
| 6968106 | Air blown fiber (ABF) cable with low composite coefficient of thermal expansion An air blown fiber tube cable having improved thermal stability in contrast to conventional air blown fiber (ABF) tube cables and within which one or more air blown optical fiber units can be installed. The air blown fiber tube is formed from a cross-linked polyolef... | 11/22/2005 |
| 6856647 | Methods and systems for neutral-to-ground communication A method of distributing wide band data using a neutral-to-ground circuit within an electrical wiring installation includes modifying a load center with an interface module which interfaces to the neutral-to-ground circuit and configuring the interface module to com... | 02/15/2005 |
| 6813324 | Synchronized communication system A synchronized communication system for communicating signals into and from a medium is disclosed. The communication system utilizes a transmitter located at a central station external to the medium, which transmits a low frequency synchronization signal into the me... | 11/02/2004 |
| 6295312 | Time diversity transmission for multichannel adaptive equalization A method and system are provided for communicating in a time-varying medium. A transmitter sends transmissions of the same message data separated in time with respect to one another. A single sensor receives the transmissions. Each received transmission i... | 09/25/2001 |
| 5493612 | Secure communication keying system The secure communication keying system has a noise generator whose output a predetermined finite band of noise within, for example, the zero to eleven hundred cycle per second range. The noise generator may be a pseudorandom noise generator that is synch... | 02/20/1996 |
| 5345473 | Apparatus for providing two-way communication in underground facilities The invention relates to an apparatus which is desiged for underground use in order to facilitate a two-way communication. The apparatus is operated within the frequency band 0.1-2 MHz, in order to make the electromagnetic waves propagate advantageously b... | 09/06/1994 |
| 4999606 | Dive parameter indicating assembly A dive parameter transmitter/receiver assembly for scuba diving includes a transmitter circuit with a control unit with one or more sensors for detecting dive parameters and/or information to be displayed. A modulator is included for modulating the parame... | 03/12/1991 |
| 4949072 | Dive parameter indicating assembly A dive parameter transmitter/receiver assembly for scuba diving includes a transmitter circuit with a control unit with one or more sensors for detecting dive parameters and/or information to be displayed. A modulator is included for modulating the parame... | 08/14/1990 |
| 4905211 | Precision doppler effect compensator A precision Doppler effect compensator provides Doppler compensation in astic transmission by simultaneously sending a known reference signal with an information signal. The information signal and reference signal undergo identical Doppler effects. The c... | 02/27/1990 |
| 4792965 | Oscillator system for detecting a selected one of a plurality of tuned circuits The system of the present invention allows transmission of information and data across a gap, for example, from the steering wheel of an automobile to the steering column, without any physical connection between the information source and the information ... | 12/20/1988 |
| 4652857 | Method and apparatus for transmitting wide-bandwidth frequency signals from mines and other power restricted environments A method and apparatus for transmitting and receiving messages by electromagnetic induction in a power restricted environment is disclosed in which the message bandwidth is narrowed prior to transmission and restored to its original breadth upon reception... | 03/24/1987 |
| 4428073 | Underwater depth telemetry An acoustic telemetry system and technique are disclosed for remotely meaing the underwater depth and descent rate of a hydrographic package. Analog signals indicative of hydrostatic pressure exerted on the package and related to its underwater depth are... | 01/24/1984 |
| 4302757 | Bore telemetry channel of increased capacity Apparatus and method for signaling within a drill hole without disturbing an ongoing drilling operation. High data rates are achieved by using phase and/or amplitude modulation techniques which enable information transfer rates well in excess of the data ... | 11/24/1981 |
| 4090135 | Wireless FSK technique for telemetering underground data to the surface A Frequency Shift Keying (FSK) system to transmit and receive data as a sequence of dual frequency short duration tone bursts. Normally the data is transmitted from an underground location, as in a mine, to the surface or to another underground location. ... | 05/16/1978 |
