Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6665472 | Optical filter having cascaded long-period gratings | Masakazu Shigehara, Hiroshi Suganuma | 2003-12-16 |
| 6522810 | Optical loss filter | Shinji Ishikawa, Masakazu Shigehara | 2003-02-18 |