Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4858694 | Heave compensated stabbing and landing tool | Dale V. Johnson, Joseph A. Burkhardt | 1989-08-22 |
| 4651818 | Metal seal tubing plug | Dale V. Johnson | 1987-03-24 |
| 4429620 | Hydraulically operated actuator | Joseph A. Burkhardt, Harry R. Hanson, Bobby M. Harkrider | 1984-02-07 |
| RE31265 | Method and apparatus for making subsea pipe connections | Albert R. Sinclair, Arthur C. Daughtry, Joseph A. Burkhardt | 1983-06-07 |
| 4359932 | Hydraulic actuator | — | 1982-11-23 |
| 4321751 | Depth measurements | Dale V. Johnson | 1982-03-30 |
| RE30311 | Apparatus and method for externally testing conduit connections | Gervase M. Chaplin | 1980-06-24 |