Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6945256 | Folding toothbrush with paste in handle | — | 2005-09-20 |
| 5766558 | Fluid catalytic cracking process and apparatus | Warren S. Letzsch | 1998-06-16 |
| 5723040 | Fluid catalytic cracking process and apparatus | Warren S. Letzsch | 1998-03-03 |
| 5662868 | Short residence time cracking apparatus and process | Warren S. Letzsch | 1997-09-02 |