Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6271420 | Preparation of quinonediimines from phenylenediamines using hydrogen peroxide and a catalyst | — | 2001-08-07 |
| 6114554 | Preparation of quinonediimines from phenylenediamines using a hypochlorite as an oxidation agent | Jayant S. Lodaya, Donald L. Fields, Jr. | 2000-09-05 |
| 6043384 | Preparation of quinoneimines from hydroxyphenylamines using hydrogen peroxide and a catalyst | Donald L. Fields, Jr., Jayant S. Lodaya | 2000-03-28 |
| 6025508 | Preparation of quinonediimines from phenylenediamines using oxygen and a metal or metal salt catalyst | Jayant S. Lodaya, Donald L. Fields, Jr. | 2000-02-15 |
| 5959126 | Formation of quinonedimines from phenylenediamines by catalytic oxidation | Otto W. Maender, Donald L. Fields, Jr. | 1999-09-28 |