Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6823125 | Optical fiber base material, its manufacturing method and optical fiber | Yukio Koumura | 2004-11-23 |
| 6542680 | Optical fiber preform | Yukio Koumura, Masahide Kuwabara | 2003-04-01 |