Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4851041 | Multiphase composite particle | Richard S. Polizzotti | 1989-07-25 |
| 4831002 | Cr-promoted hydrotreating catalysts | Teh C. Ho, Archie R. Young, Edward J. Osterhuber | 1989-05-16 |