Issued Patents 1994
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5279924 | Manufacturing method of optical diffraction grating element with serrated gratings having uniformly etched grooves | Keiji Sakai, Yukio Kurata, Takahiro Miyake, Yoshio Yoshida | 1994-01-18 |