Issued Patents All Time
Showing 26–34 of 34 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6547980 | Glass substrate for information recording medium, manufacturing method thereof, and information recording medium | Akihiro Koyama, Nobuyuki Yamamoto, Yasuhiro Saito, Kazuishi Mitani, Koichi Ataka +1 more | 2003-04-15 |
| 6440531 | Hydrofluoric acid etched substrate for information recording medium | Akihiro Koyama, Nobuyuki Yamamoto, Yasuhiro Saito, Kazuishi Mitani, Koichi Ataka +1 more | 2002-08-27 |
| 6399527 | Glass composition and substrate for information recording medium | Shoichi Kishimoto, Akihiro Koyama, Nobuyuki Yamamoto | 2002-06-04 |
| 6376403 | Glass composition and process for producing the same | Akihiro Koyama, Shoichi Kishimoto, Nobuyuki Yamamoto | 2002-04-23 |
| 6365534 | Glass composition and substrate for information recording media comprising the same | Akihiro Koyama, Shoichi Kishimoto, Nobuyuki Yamamoto | 2002-04-02 |
| 6340647 | Glass composition and substrate for information recording media comprising the same | Akihiro Koyama, Shoichi Kishimoto, Nobuyuki Yamamoto | 2002-01-22 |
| 6333286 | Glass composition and substrate for information recording media comprising the same | Akihiro Koyama, Shoichi Kishimoto, Nobuyuki Yamamoto | 2001-12-25 |
| 6306786 | Glass composition and process for producing the same | Akihiro Koyama, Shoichi Kishimoto, Nobuyuki Yamamoto | 2001-10-23 |
| 6251812 | Glass composition and substrate for information recording media comprising the same | Akihiro Koyama, Shoichi Kishimoto, Nobuyuki Yamamoto | 2001-06-26 |