Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5626956 | Hexagonal magnetic ferrite pigment for high density magnetic recording applications | David M. Hopstock, John S. Roden, Ronald S. Sapieszko | 1997-05-06 |
| 5616414 | Hexagonal magnetic ferrite pigment for high density magnetic recording applications | David M. Hopstock, John S. Roden, Ronald S. Sapieszko | 1997-04-01 |
| 5378384 | Process of making hexagonal magnetic ferrite pigment for high density magnetic recording applications | David M. Hopstock, John S. Roden, Ronald S. Sapieszko | 1995-01-03 |
| 4505720 | Granular silicon carbide abrasive grain coated with refractory material, method of making the same and articles made therewith | Thomas Gabor, David E. Broberg, Donley D. Rowenhorst | 1985-03-19 |