Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7479056 | Automated drill bit re-sharpening and verification system | Paul D Mortell, Chi Hoang, David M. McElrone, Walter James Frandsen, Jr., Charles S. Slemon | 2009-01-20 |
| 7338344 | Automated drill bit re-sharpening and verification system | Paul D Mortell, Chi Hoang, David M. McElrone, Walter James Frandsen, Jr., Charles S. Slemon | 2008-03-04 |
| 7070483 | Automated drill bit re-sharpening and verification system | Paul D Mortell, Chi Hoang, David M. McElrone, Walter James Frandsen, Jr., Charles S. Slemon | 2006-07-04 |
| 6517411 | Automated drill bit re-sharpening and verification system | Paul D Mortell, Chi Hoang, David M. McElrone, Walter James Frandsen, Jr., Charles S. Slemon | 2003-02-11 |
| 6283824 | Automated drill bit re-sharpening and verification system | Paul D Mortell, Chi Hoang, David M. McElrone, Walter James Frandsen, Jr., Charles S. Slemon | 2001-09-04 |
| 6030157 | Composite drill bit using adhesive bond | — | 2000-02-29 |
| 6030276 | Automated drill bit re-shapening and verification system | Paul D Mortell, Chi Hoang, David M. McElrone, Walter James Frandsen, Jr., Charles S. Slemon | 2000-02-29 |
| 5927912 | Composite drill bit using adhesive bond | Benjamin Mihai | 1999-07-27 |
| 5056610 | Shale diverting means for a sealed bearing drill bit | Michael S. Oliver, Chris E. Cawthorne | 1991-10-15 |