Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5338355 | Method of preparing goethite | Berndt-Ullrich Kohler | 1994-08-16 |
| 5336421 | Spinel-type spherical, black iron oxide particles and process for the producing the same | Eiichi Kurita, Kazuo Fujioka | 1994-08-09 |