Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10757266 | Terminal device, and intercom system provided with terminal device | Seiya Yamakawa, Kenji Yasukawa | 2020-08-25 |
| 10652378 | Intercom system | Seiya Yamakawa, Yuta Shimomura | 2020-05-12 |
| 10554823 | Building controller and interphone system | Hayato Takeya | 2020-02-04 |
| 10469669 | Intercom system | Seiya Yamakawa, Syu Kumagai | 2019-11-05 |
| 10334115 | Multiple dwelling house interphone system | Yuuta Shimomura | 2019-06-25 |
| 10298771 | Intercom system | Seiya Yamakawa, Yuuta Shimomura | 2019-05-21 |