Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5679894 | Apparatus and method for drilling boreholes | Volker Kruger, Herbert W. Beimgraben | 1997-10-21 |
| 5667023 | Method and apparatus for drilling and completing wells | Michael H. Johnson, Daniel J. Turick, Larry Watkins | 1997-09-16 |