Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5198294 | Composite air-filtering material | Takuichiro Masuda, Norio Umezu | 1993-03-30 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5198294 | Composite air-filtering material | Takuichiro Masuda, Norio Umezu | 1993-03-30 |