Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6133178 | High purity transparent silica glass | Nobusuke Yamada, Shinkichi Hashimoto, Koji Tsukuma, Tomoyuki Akiyama, Yoshikazu Kikuchi | 2000-10-17 |
| 5028967 | Achromatic lens for ultraviolet rays | Nobusuke Yamada, Koji Tsukuma, Tetsuo Fujii, Shinichi Kondo, Keishi Honta | 1991-07-02 |
| 4981503 | High-hardness silica glass and method of producing the same | Keiichiro Nishizawa, Shinichi Kondo | 1991-01-01 |
| 4938788 | Method of producing uniform silica glass block | Koji Tsukuma, Shinichi Kondo, Keishi Honta | 1990-07-03 |