Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5761075 | Apparatus for designing photomasks | Kiyomi Koyama | 1998-06-02 |
| 5541025 | Method and apparatus for designing photomasks | Kiyomi Koyama | 1996-07-30 |
| 5538815 | Method for designing phase-shifting masks with automatization capability | Shigehiro Hara, Kiyomi Koyama, Koji Hashimoto, Shinichi Ito, Katsuya Okumura | 1996-07-23 |