Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6991046 | Expandable eccentric reamer and method of use in drilling | Coy M. Fielder, Gary Wells, William Christian Herben | 2006-01-31 |
| 6913098 | Sub-reamer for bi-center type tools | Coy M. Fielder | 2005-07-05 |
| 6629476 | Bi-center bit adapted to drill casing shoe | Coy M. Fielder | 2003-10-07 |
| 6340064 | Bi-center bit adapted to drill casing shoe | Coy M. Fielder | 2002-01-22 |