Issued Patents 2016
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9488010 | Hammer drill | Michael V. Williams, William Christian Herben | 2016-11-08 |
| 9267539 | Mud motor bearing assembly and method | William Christian Herben, Daryl E. Bolejack | 2016-02-23 |