Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5954942 | Catalytic cracking with delayed quench | Amos A. Avidan, David L. Johnson | 1999-09-21 |
| 5389232 | Riser cracking for maximum C3 and C4 olefin yields | Yusuf G. Adewuyi, David L. Johnson, Gerald L. Teitman | 1995-02-14 |