Issued Patents 2011
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7905671 | Ink backflow preventive for water-based ball-point pens | Takeshi Omatsu, Hiroshi Inoue | 2011-03-15 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7905671 | Ink backflow preventive for water-based ball-point pens | Takeshi Omatsu, Hiroshi Inoue | 2011-03-15 |