Issued Patents 2011
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8067102 | Absorption type multi-layer film ND filter | Yoshiyuki Abe, Tokuyuki Nakayama | 2011-11-29 |
| 7894148 | Absorption type multi-layer film ND filter and process for producing the same | — | 2011-02-22 |