Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4863608 | Photocatalytic treatment of water for the preparation of ultra pure water | Hisao Satoh, Yoshiharu Ohta | 1989-09-05 |
| 4803132 | Magnetic recording medium | Mikio Kishimoto, Tetsuya Nakazumi, Shichio Kawai | 1989-02-07 |