Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6624943 | Diffractive optical element and optical system having the same | Takehiko Nakai | 2003-09-23 |
| 6590708 | Lens system having diffracting surface and refracting surface and optical apparatus using the lens system | Takehiko Nakai | 2003-07-08 |