Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7861806 | Shank structure for rotary drill bits | Anton F. Zahradnik, Eric C. Sullivan, Daniel E. Ruff, Danielle V. Roberts, Alan J. Massey | 2011-01-04 |
| 7600589 | Rotary drill bits | Anton F. Zahradnik, Eric C. Sullivan, Daniel E. Ruff, Danielle V. Roberts, Alan J. Massey | 2009-10-13 |
| 7594454 | Methods of fabricating rotary drill bits | Anton F. Zahradnik, Eric C. Sullivan, Daniel E. Ruff, Danielle V. Roberts, Alan J. Massey | 2009-09-29 |
| 7472764 | Rotary drill bit shank, rotary drill bits so equipped, and methods of manufacture | Anton F. Zahradnik, Eric C. Sullivan, Daniel E. Ruff, Danielle V. Roberts, Alan J. Massey | 2009-01-06 |