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| Number | Title | Issue Date |
| 4487433 | Anti-rotation coupling A mechanical coupling is disclosed wherein similarly pitched and profiled but oppositely threaded threads are provided for two couplings incorporating an anti-rotation member such as a tongue-and-groove or a drill hole and dowel pin.... | 12/11/1984 |
| 4476551 | Selecting offset as a function of time and velocity to stack seismograms with high signal to noise ratio In seismic exploration a method for improving seismogram displays is disclosed wherein seismograms having an offset which produces poor signal power are muted and seismograms having offsets with high signal power are stacked. The signal power in a CDP set... | 10/09/1984 |
| 4476391 | Method for improving accuracy in a neutron detector A method for improving the accuracy of neutron detectors is disclosed wherein a predetermined threshold level, by analysis of a neutron and gamma relative distribution curve, is set and all amplitudes below this predetermined minimum are removed from a ne... | 10/09/1984 |
| 4475134 | Predetermined starting point initiation system An electronic control circuit for use with a remotely operated tape recorder wherein a rewind command is issued and executed upon energization of a power source.... | 10/02/1984 |
| 4473800 | Method for detecting magnetotelluric subsurface anomalies A method for removing the effects of said subsurface anomalies in magnetotelluric survey data is disclosed wherein resistivity curves are compared and a correction factor is determined. Resistivity curves having a deviation from a mean are multiplied by t... | 09/25/1984 |
| 4465094 | Compressed air distribution system An apparatus is provided wherein one air supply is used to supply compressed air for a plurality of multi-size seismic pulse generators.... | 08/14/1984 |
| 4422164 | On-bottom seismometer electronic system An ocean bottom seismometer unit records refraction waves from a seismic source. The refraction waves are digitzed and stored in a magnetic memory. Periodically, a tape recorder is started and digital samples are transferred from digital memory to tape du... | 12/20/1983 |
| 4385021 | Method for making air hose bundles for gun arrays A method is disclosed for structuring a plurality of supply and control conduits having a length substantially greater than its cross sectional width wherein the control conduits for each supply conduit are segregated and covered. The segregated and cover... | 05/24/1983 |
| 4382486 | Tuned air gun array The present invention provides a method for determining the spacing and size of air guns in a tuned air gun array. Volume ratios are calculated based upon a predetermined maximum volume for any individual air gun. The volumes are cross-referenced to spaci... | 05/10/1983 |
| 4312049 | Method of identifying gas, oil and water zones in a subsurface formation A method of logging a wellbore to identify oil, gas and water zones in a hydrocarbon-bearing formation that is characterized by acoustic velocities which are maximum when saturated with oil, minimum when saturated with water and intermediate when saturate... | 01/19/1982 |
| 4266188 | Method and apparatus for measuring a component in a flow stream A method and apparatus for measuring the concentration of a particular component, e.g. water, in a two-component mixture, e.g. water-oil. A probe having three sets of sensor electrodes is positioned into the mixture. A first elastic sac is secured over th... | 05/05/1981 |
| 4148211 | Sampling system for engine exhaust gas analysis apparatus In apparatus for analyzing the exhaust gas of a motor vehicle, the apparatus including an oxygen sensor and means for sampling a portion of the exhaust gas and conducting the sample to the sensor, there is disclosed an improvement wherein the exhaust gas ... | 04/10/1979 |
| 4144482 | Dynamic brake circuit for motor A brake circuit for a universal motor having an armature and a field winding normally connected in series therewith, the circuit including switch means operable to disconnect the power source and electrically connect the armature in series with the field ... | 03/13/1979 |
