Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5626956 | Hexagonal magnetic ferrite pigment for high density magnetic recording applications | David M. Hopstock, John S. Roden, Gunther H. Dierssen | 1997-05-06 |
| 5622551 | Chemically derived leucite | Erik M. Erbe | 1997-04-22 |
| 5616414 | Hexagonal magnetic ferrite pigment for high density magnetic recording applications | David M. Hopstock, John S. Roden, Gunther H. Dierssen | 1997-04-01 |