Issued Patents All Time
Showing 26–43 of 43 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4919790 | Method for hydrocarbon dewaxing utilizing a reactivated spent MTG zeolite catalyst | Robert P. L. Absil, Clarence D. Chang, Donald J. Klocke | 1990-04-24 |
| 4912275 | Ammonium activation of zeolites in the presence of gaseous ammonia | Clarence D. Chang, Carol S. Lee | 1990-03-27 |
| 4902663 | Active amorphous mixed oxides | Clarence D. Chang | 1990-02-20 |
| 4891463 | Aromatization of aliphatics over a zeolite containing framework gallium | — | 1990-01-02 |
| 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 |
| 4788377 | Process for manufacturing olefins | Clarence D. Chang | 1988-11-29 |
| 4720602 | Process for converting C.sub.2 to C.sub.12 aliphatics to aromatics over a zinc-activated zeolite | — | 1988-01-19 |
| 4696807 | Crystalline microporous oxide MCM-21 and process for its preparation | Clarence D. Chang | 1987-09-29 |
| 4670412 | Modification of crystalline microporous zeolites | Clarence D. Chang, Joseph N. Miale | 1987-06-02 |
| 4665250 | Process for converting light olefins to gasoline, distillate and lube range hydrocarbons | Ernest W. Valyocsik | 1987-05-12 |
| 4594333 | Zeolite modification | Clarence D. Chang | 1986-06-10 |
| 4554396 | Olefin upgrading with ferrosilicate zeolite catalyst | Clarence D. Chang | 1985-11-19 |
| 4476338 | Olefins from methanol and/or dimethyl ether | Clarence D. Chang, Patrick D. Perkins, Ernest W. Valyocsik | 1984-10-09 |