Issued Patents All Time
Showing 1–25 of 47 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9938634 | Method of producing silicon single crystal | Masahiro Sakurada, Junya Tokue, Ryoji Hoshi | 2018-04-10 |
| 9425345 | Epitaxial wafer and manufacturing method thereof | Ryoji Hoshi, Masahiro Sakurada | 2016-08-23 |
| 9376336 | Quartz glass crucible, method for producing the same, and method for producing silicon single crystal | Akihiro Kimura, Suguru Matsumoto, Katsuhiko Miki | 2016-06-28 |
| 9337013 | Silicon wafer and method for producing the same | Ryoji Hoshi, Susumu Sonokawa, Hisayuki Saito | 2016-05-10 |
| 8147611 | Method of manufacturing single crystal | Masahiro Sakurada | 2012-04-03 |
| 8085985 | Method for determining distance between reference member and melt surface, method for controlling location of melt surface using the same, and apparatus for production silicon single crystal | Masahiko Urano | 2011-12-27 |
| 7909930 | Method for producing a silicon single crystal and a silicon single crystal | Ryoji Hoshi, Naoki Nagai | 2011-03-22 |
| 7407866 | Soi wafer and a method for producing the same | Masahiro Sakurada, Nobuaki Mitamura | 2008-08-05 |
| 7326395 | Method for producing a single crystal and silicon single crystal wafer | Nobuaki Mitamura, Takahiro Yanagimachi | 2008-02-05 |
| 7294196 | Silicon single crystal wafer, an epitaxial wafer and a method for producing a silicon single crystal | Masahiro Sakurada, Nobuaki Mitamura, Tomohiko Ohta | 2007-11-13 |
| 7258744 | Graphite heater for producing single crystal, apparatus for producing single crystal, and method for producing single crystal | Masahiro Sakurada, Satoshi Soeta, Makoto Iida | 2007-08-21 |
| 7226507 | Method for producing single crystal and single crystal | Nobuaki Mitamura, Tomohiko Ohta, Masahiro Sakurada, Atsushi Ozaki | 2007-06-05 |
| 7214268 | Method of producing P-doped silicon single crystal and P-doped N-type silicon single crystal wafer | Masahiro Sakurada | 2007-05-08 |
| 7179330 | Method of manufacturing silicon single crystal, silicon single crystal and silicon wafer | Sadayuki Okuni, Nobuaki Mitamura, Tomohiko Ohta, Nobuo Katuoka | 2007-02-20 |
| 7129123 | SOI wafer and a method for producing an SOI wafer | Masahiro Sakurada, Nobuaki Mitamura, Tomohiko Ohta | 2006-10-31 |
| 6913646 | Silicon single crystal wafer and method for producing silicon single crystal | Masahiro Sakurada, Takeshi Kobayashi, Tatsuo Mori, Tomohiko Ohta | 2005-07-05 |
| 6893499 | Silicon single crystal wafer and method for manufacturing the same | Koji Kitagawa, Ryoji Hoshi, Masahiro Sakurada, Tomohiko Ohta | 2005-05-17 |
| 6764548 | Apparatus and method for producing silicon semiconductor single crystal | Ryoji Hoshi, Takahiro Yanagimachi, Tomohiko Ohta, Yuuichi Miyahara, Tetsuya Igarashi | 2004-07-20 |
| 6632280 | Apparatus for growing single crystal, method for producing single crystal utilizing the apparatus and single crystal | Ryoji Hoshi, Koji Kitagawa, Tomohiko Ohta | 2003-10-14 |
| 6632411 | Silicon wafer and method for producing silicon single crystal | Ryoji Hoshi, Tomohiko Ohta, Shigemaru Maeda | 2003-10-14 |
| 6592662 | Method for preparing silicon single crystal and silicon single crystal | Ryoji Hoshi, Kouichi Inokoshi, Tomohiko Ohta | 2003-07-15 |
| 6565822 | Epitaxial silicon wafer, method for producing the same and subtrate for epitaxial silicon wafer | Ryoji Hoshi, Susumu Sonokawa, Masahiro Sakurada, Tomohiko Ohta | 2003-05-20 |
| 6423285 | Method for producing silicon single crystal and production apparatus therefor, as well as single crystal and silicon wafer produced by the method | Kirio Itoi, Eiichi Iino, Tohru Ishizuka, Tomohiko Ohta | 2002-07-23 |
| 6387466 | Single-crystal silicon wafer | Masakazu Sato | 2002-05-14 |
| 6153009 | Method for producing a silicon single crystal and the silicon single crystal produced thereby | Toshiharu Uesugi, Toshio Hisaichi, Tomohiko Ohta, Tetsuya Igarashi, Tetsuhiro Oda | 2000-11-28 |