Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6274227 | Magnetic recording medium having a magnetic layer and a coating thereunder | Yoji Tsukamoto, Hideaki Yasui | 2001-08-14 |
| 5840410 | Magnetic recording medium having a magnetic layer and a partially-filled liquid lubricant-containing coating thereunder | Yoji Tsukamoto, Hideaki Yasui | 1998-11-24 |
| 5612122 | High recording density magnetic recording medium having an undercoat layer of iron oxide and carbon black | Yoji Tsukamoto, Toshio Ohta | 1997-03-18 |