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| Number | Title | Issue Date |
| 8049369 | Power inverter controller and method A controller for a power inverter having a gate assembly with an alternating current power output. A gate driver controls the activation of the gate assembly while a processor controls the operation of the gate driver. A current sensor has an output signal represent... | 11/01/2011 |
| 7362235 | Impedance-matched drilling telemetry system A downhole telemetry system that uses inductance or capacitance as a mode through which signal is communicated across joints between assembled lengths of pipe wherein efficiency of signal propagation through a drill string, for example, over multiple successive pipe... | 04/22/2008 |
| 7350589 | Telemetering system A pipe installation system has a pipe composed of sections that are added and removed to increase and decrease a length of the pipe. The system further has a cable storage spool for stowing a length of cable in a compact manner inside the pipe and for paying out the... | 04/01/2008 |
| 7168510 | Electrical transmission apparatus through rotating tubular members The present invention provides an apparatus for the communication of power or data signals across the rotating gap of two tubular members, such as the stator and rotor of a mud motor, and between said rotating members of a drill string through inductive couplers loc... | 01/30/2007 |
| 7159654 | Apparatus identification systems and methods A member having a body, the body having two spaced-apart ends, wave energizable identification apparatus which, in one aspect, is radio frequency identification apparatus with integrated circuit apparatus and antenna apparatus on the exterior of the body, and encase... | 01/09/2007 |
| 7152700 | Dual wall drill string assembly A coil tubing or jointed dual wall drill string assembly for subsurface drilling. The drill string assembly includes a metallic outer tube having an outer tube first end and an outer tube second end opposite the outer tube first end. The assembly also includes a fle... | 12/26/2006 |
| 7147965 | Pressure-balanced battery for downhole tools Pressure-balanced primary and secondary batteries suited for supplying power to downhole tools and for powering a downhole telemetry network. The battery comprises an electrochemical generator disposed within at least a partially compliant enclosure or housing. The ... | 12/12/2006 |
| 7114970 | Electrical conducting system A generally tubular drill string has a conductive path over a plurality of drill pipe section (10). Each drill pipe section has a first end and a second end, and a wall, and the first end has a first radial sealing surfaces (11) and the second end has ... | 10/03/2006 |
| 7019665 | Polished downhole transducer having improved signal coupling Apparatus and methods to improve signal coupling in downhole inductive transmission elements to reduce the dispersion of magnetic energy at the tool joints and to provide consistent impedance and contact between transmission elements located along the drill string. ... | 03/28/2006 |
| 6945802 | Seal for coaxial cable in downhole tools A seal for a coaxial cable electrical connector more specifically an internal seal for a coaxial cable connector placed within a coaxial cable and its constituent components. A coaxial cable connector is in electrical communcation with an inductive transformer and a... | 09/20/2005 |
| 6720677 | Power lines and apparatus using the same Power lines include three or more conductors for transmitting alternating currents. The conductors are arranged in one combination of the conductor arrangement so that the sum of phase differences between the currents flowing through adjacent conductors is maximum, ... | 04/13/2004 |
| 6392317 | Annular wire harness for use in drill pipe An annular wire harness for use in drill pipe comprising two rings interconnected by one or more insulated conductors. The rings are positioned within annular grooves located within the tool joints and the conductors are fixed within grooves along the bor... | 05/21/2002 |
| 5793593 | Method and apparatus using a five-wire network for distribution of electrical power The present invention features a method and an apparatus for distributing electrical power from a power source to a distribution transformer, using at least one hot-phase conductor, a neutral conductor and an independent ground conductor. The neutral cond... | 08/11/1998 |
| 5777401 | Circuitry for reduction of the magnetic field in the vicinity of multiphase power lines A circuitry (1) for reducing the magnetic field from multi-phase power lines for high voltage alternating current is disclosed. One phase (R) is split into two branches (R1, R2) forming a closed loop along a line portion (L). The self-reactance of the loo... | 07/07/1998 |
| 5691691 | Power-line communication system using pulse transmission on the AC line A power-line communication system (10) for use with a conventional AC source (12) having a hot wire (14) and a neutral wire (16). The communication system (10) includes a pulse transmitter (16) and at least one receiver (18) connected downstream from the ... | 11/25/1997 |
| 5536978 | Net current control device In an electrical power system for a residential building, a multi-conductor cable supplies power to loads in the residential building from a power supply. A net current returning from loads to the power supply via alternative conductive paths different fr... | 07/16/1996 |
| 4661753 | Differential torquer A differential torquer having at least one bifilar winding mounted on the torquer is disclosed. The bifilar winding has opposing polarities and the torquer is particularly well suited for use in reducing the temperature sensitivity of torquer servo loops.... | 04/28/1987 |
| 4580112 | Active line filter for power line conducted interference A line filter for a power supply includes a differential amplifier which is driven from across an inductor in series with a principal current carrying path of the power supply. The differential amplifier output is connected to a capacitance returned to gr... | 04/01/1986 |
| 4527073 | Shielded electrical cable system Shield of telecommunications cable is grounded through negative impedance converter to reduce induced voltage in conductors in the cable caused by electromagnetic field of nearby powerline.... | 07/02/1985 |
| 4415775 | Arrangement for exchanging signals between separated circuits Arrangement for transmitting at least two signals from a first circuit arrangement to a separate second circuit arrangement. In order to realize a disturbance-independent signal transmission with a small number of signal conductors, one signal conductor w... | 11/15/1983 |
| 4048549 | Circuit for eliminating current noises from d.c. motor A circuit for eliminating a.c. noise current which is produced as a result of the interruption of electrical contact between a brush and a commutator of a d.c. motor and comprises a capacitor which applies the noise current to a transistor, which in turn ... | 09/13/1977 |
