Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D568839 | Photomask blank | Masaru Mitsui, Shigekazu Matsui, Masao Ushida | 2008-05-13 |
| D543160 | Photomask blank | Masaru Mitsui, Shigekazu Matsui, Masao Ushida | 2007-05-22 |
| 4657648 | Method of manufacturing a mask blank including a modified chromium compound | Shigekazu Matsui | 1987-04-14 |
| 4530891 | Photo-mask blank for use in lithography including a modified chromium compound | Shigekazu Matsui | 1985-07-23 |