| Patent No. | Patent Title: |
| 4632212 | Apparatus for generating seismic vibration energy in a borehole |
| 4613863 | Electronic augmentation of radar targets |
| 4597464 | Method and system for well velocity shooting and vertical seismic... |
| 4586137 | Method for generating variable well logging data composites |
| 4583207 | Magnetohydrodynamic geophone |
| 4581613 | Submersible pump telemetry system |
| 4580252 | Wide band acoustic receiver transducer |
| 4575830 | Indirect shearwave determination |
| 4573051 | Adaptive system for suppressing interferences from directional ja... |
| 4573148 | Method for the interpretation of envelope-related seismic records... |
| 4571710 | Seismic method for identifying low velocity subsurface zones |
| 4568939 | Arrangement for compensation of unwanted echoes caused by the mov... |
| 4568938 | Radar altimeter nearest return tracking |
| 4568933 | Electronic well tools and multi-channel recorder |
| 4566084 | Acoustic velocity measurements in materials using a regenerative ... |
| 4566083 | Seismic timing control system |
| 4564839 | Feature referenced error correction apparatus |
| 4562559 | Borehole acoustic telemetry system with phase shifted signal |
| 4558322 | Radar system operating by means of frequency modulated pulsed wav... |
| 4558438 | Method and apparatus for dynamically displaying geo-physical info... |
| 4555705 | System for providing a summarized information on the line spectru... |
| 4554647 | Method for measuring seismic phase shift of compressional wavefor... |
| 4554547 | Range processor for DME |
| 4553144 | Ground surveillance Doppler radar |
| 4551823 | Method and apparatus for acoustic cement bond logging |
| 4551724 | Method and apparatus for contour mapping using synthetic aperture... |
| 4550318 | Retrospective data filter |
| 4547774 | Optical communication system for drill hole logging |
| 4547778 | Method and apparatus for automatic distress call signal transmiss... |
| 4545040 | Telemetry system cable |
| 4542488 | Method and system for producing a PPI display |
| 4542487 | Method and apparatus for shear wave logging |
| 4540978 | Bistatic pulse-overlap Doppler radar intrusion detection apparatu... |
| 4538248 | Recording system for a borehole logging tool |
| 4536862 | Seismic cable assembly having improved transducers |
| 4532516 | Calibrator for distance measuring equipment |
| 4529969 | Siren |
| 4528565 | Pulse doppler radar receiver with a circuit for reducing spurious... |
| 4527260 | Method for seismic exploration by vertical seismic profiling and ... |
| 4524434 | Method for determining the azimuth and length of a deep vertical ... |
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