Issued Patents 1989
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880611 | Crystalline composition | Roland von Ballmoos, Michael E. Landis, Eric G. Derouane | 1989-11-14 |
| 4876228 | Zeolite modifications | Clarence D. Chang, Pochen Chu, Ralph M. Dessau, William E. Garwood, Guenter H. Kuehl +2 more | 1989-10-24 |
| 4873067 | Zeolite ZSM-57 | Ernest W. Valyocsik, Nancy M. Page | 1989-10-10 |
| 4871702 | Ammonium activation of zeolites in the presence of gaseous ammonia | Clarence D. Chang, Carol S. Lee, Randall D. Partridge | 1989-10-03 |
| 4837398 | Ammonium activation of zeolites in the presence of gaseous ammonia | Clarence D. Chang, Carol S. Lee | 1989-06-06 |
| 4822939 | Process for the conversion of lower aliphatic oxygenates to olefins and aromatics with gallium containing ZSM-5 catalyst | — | 1989-04-18 |