Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4760104 | Erasable ball-point pen ink | Tamotsu Miyajima, Noriatsu Tanaka | 1988-07-26 |
| 4687791 | Erasable ball-point pen ink | Tamotsu Miyajima, Noriatsu Tanaka | 1987-08-18 |
| 4629748 | Erasable ball-point pen ink | Tamotsu Miyajima, Noriatsu Tanaka | 1986-12-16 |