Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7483226 | ND filter, manufacturing method thereof, and aperture device | — | 2009-01-27 |
| 7440204 | ND filter of optical film laminate type with carbon film coating | — | 2008-10-21 |
| 7388723 | ND filter and light quantity diaphragming device including the same | — | 2008-06-17 |
| 7230779 | ND filter and aperture diaphragm apparatus | Kazutoshi Mukae | 2007-06-12 |
| 7128459 | Light-guide plate and method for manufacturing the same | Junichi Igarashi, Osamu Kitazawa | 2006-10-31 |
| 6671109 | ND filter having composite PVD film of metal and its oxide | — | 2003-12-30 |