Issued Patents All Time
Showing 101–117 of 117 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4916400 | Method for determining characteristics of the interior geometry of a wellbore | David L. Best | 1990-04-10 |
| 4899112 | Well logging apparatus and method for determining formation resistivity at a shallow and a deep depth | Jacques Jundt, Martin G. Luling, Michael O. Ross | 1990-02-06 |
| 4876511 | Method and apparatus for testing and calibrating an electromagnetic logging tool | — | 1989-10-24 |
| 4857852 | Induction well logging apparatus with transformer coupled phase sensitive detector | Robert L. Kleinberg, Weng C. Chew, David Mariani | 1989-08-15 |
| 4845433 | Apparatus for microinductive investigation of earth formations | Robert L. Kleinberg, Donald G. Dudley, Weng C. Chew | 1989-07-04 |
| RE32913 | Shields for antennas of borehole logging devices | — | 1989-04-25 |
| 4780678 | Apparatus for microinductive investigation of earth formations | Robert L. Kleinberg, Weng C. Chew | 1988-10-25 |
| 4766384 | Well logging apparatus for determining dip, azimuth, and invaded zone conductivity | Robert L. Kleinberg, Weng C. Chew, David Mariani | 1988-08-23 |
| 4739272 | Apparatus for microinductive investigation of earth formations with improved electroquasistatic shielding | Douglas D. Griffin, Weng C. Chew, Robert L. Kleinberg | 1988-04-19 |
| 4712070 | Apparatus for microinductive investigation of earth formations | Weng C. Chew | 1987-12-08 |
| 4704581 | Electromagnetic logging apparatus using vertical magnetic dipole slot antennas | — | 1987-11-03 |
| 4689572 | Electromagnetic logging apparatus with slot antennas | — | 1987-08-25 |
| 4659992 | Method and apparatus for electromagnetic logging with reduction of spurious modes | Gerald S. Huchital | 1987-04-21 |
| 4574242 | Electromagnetic logging with reduction of spurious transverse magnetic components | Gerald S. Huchital | 1986-03-04 |
| 4553097 | Well logging apparatus and method using transverse magnetic mode | — | 1985-11-12 |
| 4538109 | Apparatus and method for electromagnetic logging with reduction of spurious modes | — | 1985-08-27 |
| 4536714 | Shields for antennas of borehole logging devices | — | 1985-08-20 |