Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8387724 | Rotary drill bit with nozzles designed to enhance hydraulic performance and drilling fluid efficiency | Ephraim Gutmark | 2013-03-05 |
| 8312942 | Roller cone drill bits with improved fluid flow | Micheal Burl Crawford | 2012-11-20 |
| 8047308 | Rotary drill bit with nozzles designed to enhance hydraulic performance and drilling fluid efficiency | Ephraim Gutmark | 2011-11-01 |
| 7802640 | Rotary drill bit with nozzles designed to enhance hydraulic performance and drilling fluid efficiency | Ephraim Gutmark | 2010-09-28 |