Issued Patents All Time
Showing 26–47 of 47 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6117231 | Method of manufacturing semiconductor silicon single crystal wafer | Toshirou Hayashi, Ryoji Hoshi, Tomohiko Ohta | 2000-09-12 |
| 5938841 | Device for producing a single crystal | Kouji Kitagawa, Kouji Mizuishi, Masahiko Urano, Kenji Araki, Eiichi Iino | 1999-08-17 |
| 5871583 | Apparatus for producing silicon single crystal | Kiyotaka Takano, Hirotoshi Yamagishi | 1999-02-16 |
| 5851283 | Method and apparatus for production of single crystal | Ryouji Hoshi, Masashi Sonokawa, Tomohiko Ohta | 1998-12-22 |
| 5834322 | Heat treatment of Si single crystal | Hirotoshi Yamagishi, Nobuyoshi Fujimaki, Yukio Karasawa | 1998-11-10 |
| 5766346 | Apparatus for producing silicon single crystal | Toshirou Hayashi, Ryouji Hoshi, Tomohiko Ohta | 1998-06-16 |
| 5725661 | Equipment for producing silicon single crystals | Toshiro Hayashi, Tomohiko Ohta, Masayuki Arai | 1998-03-10 |
| 5720809 | Crucible for pulling silicon single crystal | Eiichi Iino, Kiyotaka Takano, Hirotoshi Yamagishi | 1998-02-24 |
| 5688319 | Method for testing electrical properties of silicon single crystal | Hirotoshi Yamagishi, Nobuyoshi Fujimaki, Yukio Karasawa | 1997-11-18 |
| 5534112 | Method for testing electrical properties of silicon single crystal | Hirotoshi Yamagishi, Nobuyoshi Fujimaki, Yukio Karasawa | 1996-07-09 |
| 5501172 | Method of growing silicon single crystals | Toshinari Murai, Eiichi Iino, Hideo Arai, Hirotoshi Yamagishi | 1996-03-26 |
| 5462010 | Apparatus for supplying granular raw material for a semiconductor single crystal pulling apparatus | Kiyotaka Takano, Hirotoshi Yamagishi, Koji Mizuishi, Katsuhiko Ogino | 1995-10-31 |
| 5386796 | Method for testing quality of silicon wafer | Hirotoshi Yamagishi, Nobuyoshi Fujimaki, Yukio Karasawa | 1995-02-07 |
| 5373805 | Single crystal pulling apparatus | Kiyotaka Takano, Hirotoshi Yamagishi | 1994-12-20 |
| 5361721 | Single crystal pulling apparatus | Kiyotaka Takano, Hirotoshi Yamagishi | 1994-11-08 |
| 5359959 | Method for pulling up semi-conductor single crystal | Hirotoshi Yamagishi | 1994-11-01 |
| 5340434 | Process for producing silicon single crystal | Kiyotaka Takano, Hirotoshi Yamagishi | 1994-08-23 |
| 5306387 | Method for pulling up semiconductor single crystal | Hirotoshi Yamagishi | 1994-04-26 |
| 5262338 | Method for fabrication of semiconductor device | Hirotoshi Yamagishi, Nobuyoshi Fujimaki, Yukio Karasawa | 1993-11-16 |
| 5248378 | Method and apparatus for producing silicon single crystal | Tetsuhiro Oda, Hirotoshi Yamagishi, Atsushi Iwasaki, Akiho Maeda, Shinobu Takeyasu +2 more | 1993-09-28 |
| 5110404 | Method for heat processing of silicon | Hirotoshi Yamagishi, Takao Abe | 1992-05-05 |
| 4956153 | Apparatus for Czochralski single crystal growing | Hirotoshi Yamagishi, Shuuji Yokota, Takao Abe | 1990-09-11 |