Issued Patents All Time
Showing 26–29 of 29 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6367323 | Dynamic pressure device for oil drill systems | Michael T. Sutherland, Anthony R. Dopf, Derek W. Logan, Randall S. Liscombe | 2002-04-09 |
| 6158532 | Subassembly electrical isolation connector for drill rod | Derek W. Logan, Anthony R. Dopf | 2000-12-12 |
| 6061024 | Duplexing antenna for portable radio transceiver | Andrew E. McGirr, John Godfrey McRory | 2000-05-09 |
| 6050353 | Subassembly electrical isolation connector for drill rod | Derek W. Logan, Anthony R. Dopf | 2000-04-18 |