Issued Patents 2019
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10469669 | Intercom system | Syu Kumagai, Akira Kai | 2019-11-05 |
| 10334114 | Collective housing/building entrance device and entryphone system having that collective housing/building entrance device | Kenji Yasukawa | 2019-06-25 |
| 10298771 | Intercom system | Akira Kai, Yuuta Shimomura | 2019-05-21 |