Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886901 | Method for purifying a crude dimethyl naphthalene dicarboxylate | Robert D. Oltrogge, Dennis J. Michalak | 1989-12-12 |
| 4876386 | Process for the oxidation of di- or trimethylbenzenes in the presence of cobalt and manganese from oxidation residue incinerator ash | Dennis J. Michalak, Wayne P. Schammel | 1989-10-24 |