| 4904956 |
Linear digital frequency sweep synthesizer |
Charles L. Dennis |
1990-02-27 |
| 4686477 |
Multiple frequency electric excitation method and identifying complex lithologies of subsurface formations |
Wyatt W. Givens |
1987-08-11 |
| 4546318 |
Method for regulating current flow through core samples |
— |
1985-10-08 |
| 4519011 |
Power control circuit |
— |
1985-05-21 |
| 4514770 |
Electronic circuit |
Robert PRZYBYL |
1985-04-30 |
| 4511999 |
Gun shot control unit for seismic exploration |
Gordon R. Deline, Gerard D. Koeijmans |
1985-04-16 |
| 4475134 |
Predetermined starting point initiation system |
Robert PRZYBYL |
1984-10-02 |
| 4462094 |
Method and apparatus for determining angle of inclination of seismometer and leveling seismic motion detectors |
Maurice Prior |
1984-07-24 |
| 4446537 |
Electronic system for release of on-bottom seismometer unit |
Gordon R. Deline, Gerard D. Koeijmans |
1984-05-01 |
| 4427935 |
Constant current source |
— |
1984-01-24 |
| 4422164 |
On-bottom seismometer electronic system |
Gordon R. Deline, Gerard D. Koeijmans |
1983-12-20 |
| 4296442 |
On-board analog reproducer unit for ocean-bottom seismometer |
— |
1981-10-20 |