Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12371812 | Quartz glass crucible and manufacturing method thereof | Hiroshi Kishi, Eriko Kitahara | 2025-07-29 |
| 9708730 | Quality-evaluated vitreous silica crucible | Toshiaki Sudo, Tadahiro Sato, Ken Kitahara | 2017-07-18 |
| 9653268 | Inspection method of vitreous silica crucible | Toshiaki Sudo, Tadahiro Sato, Ken Kitahara | 2017-05-16 |
| 9557276 | Inspection method of vitreous silica crucible | Toshiaki Sudo, Tadahiro Sato, Ken Kitahara | 2017-01-31 |
| 9260795 | Closure for silica glass crucible, silica glass crucible and method of handling the same | Masaru Sato | 2016-02-16 |
| 5195481 | Two-cycle engine with separate lubricating system | Yoshihito Oyama, Kenji Ikeda | 1993-03-23 |