Issued Patents 2005
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6842301 | ND filter and aperture device including the same | Katsura Nakajima, Nobutaka Kumada | 2005-01-11 |
| 6842302 | ND filter, method for producing the ND filter, and aperture device including the ND filter | Katsura Nakajima, Nobutaka Kumada | 2005-01-11 |