Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6309438 | Filter unit and dust-proof mask therewith | Tomoaki Kanno, Kunio Yamada | 2001-10-30 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6309438 | Filter unit and dust-proof mask therewith | Tomoaki Kanno, Kunio Yamada | 2001-10-30 |