Issued Patents 2016
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9488007 | Wear resistant plates on a leading transitional surface of the leg for a rotary cone drill bit | David Michel Harrington, Cesar A. Fierro | 2016-11-08 |
| 9260922 | Roller cone drill bit with cuttings evacuator | David Michel Harrington | 2016-02-16 |