Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6804437 | Diffraction grating device manufacturing method, diffraction grating device manufacturing apparatus, and diffraction grating device | Kiyotaka Murashima, Ken Hashimoto, Toshikazu Shibata, Akira Inoue, Masakazu Shigehara | 2004-10-12 |
| 6766080 | Optical waveguide type defraction grating device and a method of manufacturing thereof | Masakazu Shigehara | 2004-07-20 |