Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8409321 | Method and apparatus for leaching metal from mining ore | — | 2013-04-02 |
| 7954791 | Fine bubble airlift device | Roy Trence Johnson | 2011-06-07 |
| 7934706 | Aeration device for use as a diffuser | — | 2011-05-03 |
| 7806410 | Damping device for a stationary labyrinth seal | Yehia M. El-Aini, Lawrence P. Roberts, Stuart K. Montgomery, Gary A. Davis | 2010-10-05 |
| 7622040 | Fine bubble airlift device | Roland Schmidt, Roy Trence Johnson | 2009-11-24 |
| 5811038 | Method of blending components for porous plastic pipe processing | — | 1998-09-22 |
| 5811164 | Aeration pipe and method of making same | — | 1998-09-22 |
| 4958770 | Process for making uniform porosity flexible irrigation pipe | — | 1990-09-25 |