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| Number | Title | Issue Date |
| 7411517 | Apparatus and method for providing communication between a probe and a sensor A wireless data communication system for a down hole environment. The system includes a housing containing a sensor, positioned within a tubular, for collecting information and processing the information, a modulator for modulating the information from the sensor in... | 08/12/2008 |
| 7183771 | Multiple transmitter and receiver well logging device with error calibration system including calibration injection system A device and method for obtaining an electromagnetic propagation measurement of a subterranean geologic formation, with the formation being intersected by a borehole. The device comprises a transmitter for transmitting an electromagnetic signal, and a first and seco... | 02/27/2007 |
| 6822455 | Multiple transmitter and receiver well logging system and method to compensate for response symmetry and borehole rugosity effects The invention provides a system for determining geologic formation resistivity while drilling and a new method providing compensation for the vertical asymmetries of the tool response and the effects of borehole rugosity. The apparatus and method allows the construc... | 11/23/2004 |
| 6777940 | Apparatus and method for resistivity well logging Well logging apparatus and methods for determining formation resistivity at multiple (>3) depths of investigation. At least one transmitter antenna and at least two receiver antennas are mounted in a logging tool housing, on substantially a common axis. The a... | 08/17/2004 |
