Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8048596 | Photomask producing method and photomask blank | Yasushi Okubo | 2011-11-01 |
| 7709161 | Photomask producing method and photomask blank | Yasushi Okubo | 2010-05-04 |
| 7314690 | Photomask producing method and photomask blank | Yasushi Okubo | 2008-01-01 |