Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6294097 | Method for treating waste water containing nitrate ions | Yoshimasa Katayama | 2001-09-25 |
| 5820385 | Magnetic display apparatus | Takao Namiki | 1998-10-13 |
| 5674104 | Magnetic pen | Takao Namiki | 1997-10-07 |
| 5041045 | Wind instrument toy | — | 1991-08-20 |
| 4942502 | Light projecting toy musical box | — | 1990-07-17 |
| 4858079 | Light projecting toy musical box | — | 1989-08-15 |