Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4794040 | Magnetic recording medium having a back coat layer containing carbon black having defined ranges of pH and coloring power | Yukio Matsumoto, Hiroshi Togashi, Hiroshi Ogino | 1988-12-27 |
| 4770932 | Magnetic recording medium having an improved back coat layer | Yukio Matsumoto, Hiroshi Togashi, Hiroshi Ogino | 1988-09-13 |
| 4761331 | Magnetic recording medium having a back coat layer containing carbon black treated with fatty acids | Hiroshi Ogino, Yukio Matsumoto, Hiroshi Togashi | 1988-08-02 |
| 4645724 | Magnetic recording medium comprising a specific type of lubricant | Tsunehide Naruse, Yukio Matsumoto | 1987-02-24 |