Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7611300 | Double-head writing instrument | — | 2009-11-03 |
| 7575385 | Double-head writing instrument | — | 2009-08-18 |
| 7374356 | Double-head writing instrument | — | 2008-05-20 |
| 6890118 | Writing instrument | — | 2005-05-10 |
| 6336762 | Direct-fluid-supply writing device | — | 2002-01-08 |
| 6244775 | Writing implement | — | 2001-06-12 |
| 5967687 | Direct liquid supply writing implement | — | 1999-10-19 |