Issued Patents All Time
Showing 26–45 of 45 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5657826 | Guidance system for drilling boreholes | — | 1997-08-19 |
| 5589775 | Rotating magnet for distance and direction measurements from a first borehole to a second borehole | — | 1996-12-31 |
| 5515931 | Single-wire guidance system for drilling boreholes | — | 1996-05-14 |
| 5513710 | Solenoid guide system for horizontal boreholes | — | 1996-05-07 |
| 5512830 | Measurement of vector components of static field perturbations for borehole location | — | 1996-04-30 |
| 5485089 | Method and apparatus for measuring distance and direction by movable magnetic field source | — | 1996-01-16 |
| 5343152 | Electromagnetic homing system using MWD and current having a funamental wave component and an even harmonic wave component being injected at a target well | — | 1994-08-30 |
| 5305212 | Alternating and static magnetic field gradient measurements for distance and direction determination | — | 1994-04-19 |
| 5258755 | Two-source magnetic field guidance system | — | 1993-11-02 |
| 5218301 | Method and apparatus for determining distance for magnetic and electric field measurements | — | 1993-06-08 |
| 5074365 | Borehole guidance system having target wireline | — | 1991-12-24 |
| 4933640 | Apparatus for locating an elongated conductive body by electromagnetic measurement while drilling | — | 1990-06-12 |
| 4845434 | Magnetometer circuitry for use in bore hole detection of AC magnetic fields | Bruce Thompson | 1989-07-04 |
| 4791373 | Subterranean target location by measurement of time-varying magnetic field vector in borehole | — | 1988-12-13 |
| 4700142 | Method for determining the location of a deep-well casing by magnetic field sensing | — | 1987-10-13 |
| 4529939 | System located in drill string for well logging while drilling | — | 1985-07-16 |
| 4502010 | Apparatus including a magnetometer having a pair of U-shaped cores for extended lateral range electrical conductivity logging | — | 1985-02-26 |
| 4443762 | Method and apparatus for detecting the direction and distance to a target well casing | — | 1984-04-17 |
| 4372398 | Method of determining the location of a deep-well casing by magnetic field sensing | — | 1983-02-08 |
| 4323848 | Plural sensor magnetometer arrangement for extended lateral range electrical conductivity logging | — | 1982-04-06 |