Issued Patents 2011
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7933189 | Focus optical system and optical disc master exposure apparatus | Takaaki Kassai, Kenji Maebara, Keiji Fujita, Hiroaki Ashiwa | 2011-04-26 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7933189 | Focus optical system and optical disc master exposure apparatus | Takaaki Kassai, Kenji Maebara, Keiji Fujita, Hiroaki Ashiwa | 2011-04-26 |