Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6427783 | Steerable modular drilling assembly | Volker Krueger, Thomas Kruspe, Johannes Witte, Detlef Ragnitz | 2002-08-06 |
| 5881808 | Window-cutting system for downhole tubulars | John J. Johnson | 1999-03-16 |
| 5697438 | Torque control device for downhole milling | Edgar D. Lueders, Wayne Biart | 1997-12-16 |
| 5678634 | Method and apparatus for retrieving a whipstock | Gerald D. Lynde, Ed Lueders, Bryan F. McKinley, John J. Johnson, Greg Nazzal | 1997-10-21 |
| 5676206 | Window-cutting system for downhole tubulars | John J. Johnson | 1997-10-14 |