Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5667023 | Method and apparatus for drilling and completing wells | John W. Harrell, Michael H. Johnson, Larry Watkins | 1997-09-16 |
| 5662170 | Method of drilling and completing wells | Joseph F. Donovan, Michael H. Johnson | 1997-09-02 |