Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7973111 | Mechanically operated kill agent injection safety system and method to stop a runaway chemical reaction | Thanh T. Nguyen, Tom Eugene Cushman, John Stevenson | 2011-07-05 |
| 5122583 | Efficiency of a pre-polymerized catalyst | John A. Ewen, David L. Gressett, Herbert Hummel | 1992-06-16 |
| 4767735 | Catalyst pretreatment process | John A. Ewen | 1988-08-30 |