Issued Patents All Time
Showing 51–65 of 65 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5408097 | Method and apparatus for correcting natural gamma ray measurements for borehole fluid effects | Donald C. McKeon | 1995-04-18 |
| 5349184 | Method and apparatus for reducing matrix density effects on porosity measurements during epithermal neutron porosity well logging | — | 1994-09-20 |
| 5180917 | Self-calibrating proportional counter | — | 1993-01-19 |
| 5124844 | Method and apparatus for locating celestial objects | — | 1992-06-23 |
| 5107705 | Video system and method for determining and monitoring the depth of a bottomhole assembly within a wellbore | James C. Mayes, Jacques Orban | 1992-04-28 |
| 5051581 | Method and apparatus for epithermal neutron porosity well logging | Russell C. Hertzog, William A. Loomis | 1991-09-24 |
| 5017778 | Methods and apparatus for evaluating formation characteristics while drilling a borehole through earth formations | — | 1991-05-21 |
| 4928088 | Apparatus for extracting recorded information from a logging tool | Bruno Jorion, Christian Galiano | 1990-05-22 |
| 4926044 | Thermal decay time logging method and apparatus | — | 1990-05-15 |
| 4879463 | Method and apparatus for subsurface formation evaluation | Edouard Marienbach, Jean-Michel Hache, Erik Rhein-Knudsen, Mike Evans | 1989-11-07 |
| 4845359 | Methods and apparatus for safely handling radioactive sources in measuring-while-drilling tools | — | 1989-07-04 |
| 4814609 | Methods and apparatus for safely measuring downhole conditions and formation characteristics while drilling a borehole | Edouard Marienbach, Jean-Michel Hache, Erik Rhein-Knudsen, Mike Evans | 1989-03-21 |
| 4810876 | Logging apparatus and method for determining absolute elemental concentrations of subsurface formations | Russel C. Hertzog, Darwin V. Ellis, Hubert D. Scott, Jeffrey S. Schweitzer, James A. Grau | 1989-03-07 |
| 4721853 | Thermal decay time logging method and apparatus | — | 1988-01-26 |
| 4676022 | Rotatable insect trap device | — | 1987-06-30 |