Issued Patents All Time
Showing 26–50 of 53 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6601456 | Fretting fixture for high-cycle fatigue test machines | David L. Davidson, John Campbell | 2003-08-05 |
| 6488117 | Vertical-force vibrator seismic wave source | — | 2002-12-03 |
| 6119804 | Horizontally polarized shear-wave vibrator seismic source | — | 2000-09-19 |
| 6023980 | High-cycle fatigue test machine | David L. Davidson, Andrew G. Nagy | 2000-02-15 |
| 5456325 | Method and apparatus for driving a probe into the earth | Pontie J. Pantermuehl, Donald H. Heihn | 1995-10-10 |
| 5452763 | Method and apparatus for generating gas in a drilled borehole | — | 1995-09-26 |
| 5302782 | Three-component borehole wall-locking seismic detector | — | 1994-04-12 |
| 5229977 | Directional underwater acoustic pulse source | — | 1993-07-20 |
| 5228011 | Variable multi-stage arc discharge acoustic pulse source transducer | — | 1993-07-13 |
| 5225731 | Solid body piezoelectric bender transducer | — | 1993-07-06 |
| 5173274 | Flash liquid aerosol production method and appartus | — | 1992-12-22 |
| 5081391 | Piezoelectric cylindrical transducer for producing or detecting asymmetrical vibrations | — | 1992-01-14 |
| 5080190 | Reversible rigid coupling apparatus and method for borehole seismic transducers | Jorge O. Parra | 1992-01-14 |
| 5030873 | Monopole, dipole, and quadrupole borehole seismic transducers | — | 1991-07-09 |
| 4905210 | Liquid impoundment survey vehicle incorporating positioning finding and tracking system | — | 1990-02-27 |
| 4835474 | Method and apparatus for detecting subsurface anomalies | Jorge O. Parra, Bob M. Duff | 1989-05-30 |
| 4801411 | Method and apparatus for producing monosize ceramic particles | Stephen T. Wellinghoff | 1989-01-31 |
| 4751841 | Liquid impoundment leak rate detector | James C. Biard | 1988-06-21 |
| 4740757 | Method and apparatus for locating leaks in a multiple layer geomembrane liner | Merle E. Converse | 1988-04-26 |
| 4725785 | Directional potential analyzer method and apparatus for detecting and locating leaks in geomembrane liners | Merle E. Converse, Kathryn B. Glass | 1988-02-16 |
| 4720669 | Geomembrane leak assessment shell shaped probe | — | 1988-01-19 |
| 4706228 | Asymmetrical lateral-force seismic source transducer | Edgar C. Schroeder | 1987-11-10 |
| 4651311 | Electrodeless spark discharge acoustic pulse transducer for borehole operation | Edgar C. Schroeder | 1987-03-17 |
| 4525645 | Cylindrical bender-type vibration transducer | Donald J. Shirley | 1985-06-25 |
| 4467283 | Electrical geophysical exploration system with addressable current probes | Glenn T. Darilek, Wendell R. Peters, Edward Bryan | 1984-08-21 |