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| Number | Title | Issue Date |
| 4246652 | Seismic source signatured evaluation apparatus Apparatus is provided for determining the conformity of an energy pulse generated by a weight drop seismic source to a defined energy pulse characteristic in order that reflections associated with a non-conforming energy pulse can be rejected. The apparat... | 01/20/1981 |
| 4223399 | Seismic exploration method A seismic exploration method in which a coded energy signal is generated and transmitted into the earth, the seismic energy reflected from within the earth is sensed and sampled to form a raw trace, the raw trace is crosscorrelated with a record of the co... | 09/16/1980 |
| 4218766 | Method of seismic wave amplitude normalization Disclosed is a method of processing geological seismic reflection data to compensate for lateral variations in the attenuation effect which the weathered layer has on the reflected seismic energy waves as they approach an array of detectors at the surface... | 08/19/1980 |
| 4203161 | Method of enhancing common depth point seismic data A method of enhancing a "gather" formed of a plurality of unmoved out common depth point (CDP) data traces. The gather is formed of a plurality of seismic traces arranged in a display in which time varies along the horizontal axis and distance between sou... | 05/13/1980 |
| 4168484 | Method of and apparatus for radiant energy measurement of impedance transitions in media, for identification and related purposes This disclosure deals with measuring either discontinuous or continuous impedance transitions in various media to identify or delineate the properties and nature thereof by transmitting radiant energy waves to such media to produce reflected waves therefr... | 09/18/1979 |
| 4101866 | Marine detector spread having arrays of different lengths A detector spread for marine seismic exploration has arrays with lengths which are dependent upon the acoustic velocity and dip of the subsurface formations being explored, upon the offset distance from the seismic source to the array and upon the reflect... | 07/18/1978 |
| 4068210 | Seismic vibrator phase detector A phase detector for detecting the phase difference between a pilot reference signal and a feedback signal generated by movement of a vibrator baseplate. The detector includes a phase shifter for providing a delayed reference signal phase-shifted from the... | 01/10/1978 |
| 4064481 | Vibrator and processing systems for vibratory seismic operations Method and apparatus for carrying out vibratory seismic operations and processing seismic records, involving generating a square wave analog sweep signal for driving a vibrator, generating a square wave analog, or 1 bit digitized transmitted signal, digit... | 12/20/1977 |
| 4042905 | Data acquisition, transport and storage system This abstract describes a system for the field recording of seismic data in which a plurality of geophone outputs are connected to an array terminal. Each geophone is connected to a fixed gain differential amplifier of high gain. The outputs of the amplif... | 08/16/1977 |
| 3975674 | Geothermal exploration method utilizing electrical resistivity and seismic velocity A method of geothermal exploration in which the arrival times of reflected seismic waves and voltage differences caused by subsurface current flow are detected and processed to provide useful estimates of subsurface porosity, pore-fluid resistivity and eq... | 08/17/1976 |
| 3968471 | Method for suppressing side lobes in correlation processes This invention relates to an improved method of seismograph exploration by means of time-variant oscillatory signals whereby the side lobes of the correlograms (or of the output waveforms) are randomized to prevent constructive reinforcement during vertic... | 07/06/1976 |
