Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7635224 | Method of adjusting backlash in a down hole bearing assembly | — | 2009-12-22 |
| 7308956 | Method of securing a rotary cutter to a body of a down hole tool and a rotary cutter assembly | Robert Wenzel | 2007-12-18 |
| 7299886 | Stabilized down hole drilling motor | — | 2007-11-27 |
| 7186182 | Drive line for down hole mud motor | Daryl A Ronaghan | 2007-03-06 |
| 6732819 | Mudsaver valve with retrievable inner sleeve | — | 2004-05-11 |
| 5964307 | Shock tool for use in directional drilling | — | 1999-10-12 |
| 5547032 | Apparatus for drilling curved sections of well holes | — | 1996-08-20 |
| 5350242 | Bearing assembly for a downhole motor | — | 1994-09-27 |
| 5267905 | Sealed downhole motor drive shaft universal joint assembly | Douglas Wenzel, Robert Wenzel | 1993-12-07 |
| 5150972 | Method of increasing the off bottom load capacity of a bearing assembly | — | 1992-09-29 |
| 5101914 | Orientatable adjustable bent housing | — | 1992-04-07 |
| 5052501 | Adjustable bent housing | Douglas Wenzel, Robert Wenzel | 1991-10-01 |