Issued Patents 2018
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9963937 | Method and apparatus for controlling downhole rotational rate of a drilling tool | Nicholas Ryan Marchand, Ralph William Graeme Johns | 2018-05-08 |
| RE46746 | Mud-lubricated bearing assembly with mechanical seal | Nicholas Ryan Marchand | 2018-03-06 |