Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5098991 | Process of preparing polyamide-imide and polyimide polymers from acid anhydrides and dianhydrides of disubstituted maleic anhydrides | David A. Young, Ellis K. Fields | 1992-03-24 |
| 5072003 | Acid anhydrides and dianhydrides of disubstituted maleic anhydrides | Ellis K. Fields | 1991-12-10 |
| 5003085 | Acid anhydrides and dianhydrides of disubstituted maleic anhydrides | David A. Young, Ellis K. Fields | 1991-03-26 |
| 4638072 | Disubstituted maleic anhydride compounds | Ellis K. Fields, Mark L. Winzenburg | 1987-01-20 |
| 4596867 | Disubstituted maleic anhydride compounds | Ellis K. Fields, Mark L. Winzenburg | 1986-06-24 |