Issued Patents All Time
Showing 1–25 of 41 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6541408 | Zeolite catalysts having stabilized hydrogenation-dehydrogenation function | Clarence D. Chang | 2003-04-01 |
| 6346498 | Zeolite catalysts having stabilized hydrogenation-dehydrogenation function | Clarence D. Chang | 2002-02-12 |
| 5726114 | Method of preparation of ex situ selectivated zeolite catalysts for enhanced shape selective applications and methods to increase the activity thereof | Clarence D. Chang, John D. Lutner, Sharon B. McCullen, David S. Shihabi | 1998-03-10 |
| 5607888 | Regioselective methylation of toluene to para-xylene | Clarence D. Chang | 1997-03-04 |
| 5571768 | Zeolite functionalized with organosiliceous groups | Clarence D. Chang | 1996-11-05 |
| 5541146 | Extrusion-modified molecular sieve | Clarence D. Chang, Cynthia T-W. Chu, Thomas F. Degnan, David S. Shihabi | 1996-07-30 |
| 5516736 | Selectivating zeolites with organosiliceous agents | Clarence D. Chang | 1996-05-14 |
| 5498814 | Regioselective methylation of toluene to para-xylene | Clarence D. Chang | 1996-03-12 |
| 5475179 | Regioselective production of para-dialkyl benzenes | Clarence D. Chang | 1995-12-12 |
| 5457257 | Isoparaffin/olefin alkylation with minimal acid inventory | Clarence D. Chang | 1995-10-10 |
| 5455213 | Shape selective hydrocarbon conversion over pre-selectivated, activated catalyst | Clarence D. Chang | 1995-10-03 |
| 5365003 | Shape selective conversion of hydrocarbons over extrusion-modified molecular sieve | Clarence D. Chang, Cynthia T-W. Chu, Thomas F. Degnan, David S. Shihabi | 1994-11-15 |
| 5349113 | Shape selective hydrocarbon conversion over pre-selectivated, activated catalyst | Clarence D. Chang | 1994-09-20 |
| 5321183 | Process for the regioselective conversion of aromatics to para-disubstituted benzenes | Clarence D. Chang | 1994-06-14 |
| 5220086 | Catalytic processes in the presence of zeolites of increased internal acid activity and decreased external acid activity | — | 1993-06-15 |
| 5068048 | Lubricants and lube additives from epoxidation of lower olefin oligomers | Catherine S. H. Chen | 1991-11-26 |
| 5057640 | Propylene oligomerization over silica modified zeolites | Clarence D. Chang | 1991-10-15 |
| 5035818 | Amide and sulfonic acid derivation of lower olefin oligomers | Catherine S. H. Chen | 1991-07-30 |
| 5021178 | Acylation of lower olefin oligomers | Catherine S. H. Chen | 1991-06-04 |
| 4997632 | Method of removing chlorofluorocarbons from the atmosphere | — | 1991-03-05 |
| 4992189 | Lubricants and lube additives from hydroxylation and esterification of lower alkene oligomers | Catherine S. H. Chen | 1991-02-12 |
| 4992614 | Reactivation of partially deactivated catalyst employing ultrasonic energy | — | 1991-02-12 |
| 4914256 | Reactivation of partially deactivated catalyst employing ultrasonic energy | — | 1990-04-03 |
| 4910357 | Alkylate upgrading | Ralph M. Dessau | 1990-03-20 |
| 4849568 | Stabilization of zinc on catalysts | Sharon B. McCullen | 1989-07-18 |