Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8544123 | Flush toilet | Mayu Okubo, Yoshikazu Ushijima, Yoshinobu Kato, Ryosuke Hayashi, Shinji Shibata | 2013-10-01 |
| 8418277 | Flush toilet | Mayu Okubo, Yoshikazu Ushijima, Yoshinobu Kato, Ryosuke Hayashi, Ayako Harada | 2013-04-16 |
| 8281424 | Flush toilet | Mayu Okubo, Yoshikazu Ushijima, Yoshinobu Kato, Ryosuke Hayashi | 2012-10-09 |