Issued Patents All Time
Showing 26–30 of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5407021 | Down-the-hole hammer drill having reverse circulation | Robert F. Kane, Matthew Floyd Shofner, Kenneth Ahlhorn | 1995-04-18 |
| 5163523 | Screw thread structure for percussion drill driver sub and case | Robert F. Kane, Joel Ham, David Mildren | 1992-11-17 |
| 5090500 | Replaceable wear sleeve for percussion drill | Robert F. Kane | 1992-02-25 |
| 5060740 | Screw thread coupling | Robert F. Kane, Joel Ham, David Mildren | 1991-10-29 |
| 5056611 | Screw thread structure | Robert F. Kane, Joel Ham, David Mildren | 1991-10-15 |