Issued Patents 2011
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7891443 | Hardfacing around ball loading hole for earth-boring bit | David K. Luce, Keith L. Nehring | 2011-02-22 |
| 7861806 | Shank structure for rotary drill bits | Anton F. Zahradnik, Eric C. Sullivan, R. Scot Smith, Daniel E. Ruff, Danielle V. Roberts | 2011-01-04 |