Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6139946 | Magnetic recording media incorporating a quaternary ammonium functional binder and magnetic pigment surface treated with compound having acidic and electron withdrawing functionalities | Joseph Bailey | 2000-10-31 |
| 5626956 | Hexagonal magnetic ferrite pigment for high density magnetic recording applications | David M. Hopstock, Gunther H. Dierssen, Ronald S. Sapieszko | 1997-05-06 |
| 5616414 | Hexagonal magnetic ferrite pigment for high density magnetic recording applications | David M. Hopstock, Gunther H. Dierssen, Ronald S. Sapieszko | 1997-04-01 |
| 5378384 | Process of making hexagonal magnetic ferrite pigment for high density magnetic recording applications | David M. Hopstock, Gunther H. Dierssen, Ronald S. Sapieszko | 1995-01-03 |
| 5240626 | Aqueous ferrofluid | Ranjit Thakur | 1993-08-31 |