Issued Patents 2019
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10334115 | Multiple dwelling house interphone system | Akira Kai | 2019-06-25 |
| 10298771 | Intercom system | Seiya Yamakawa, Akira Kai | 2019-05-21 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10334115 | Multiple dwelling house interphone system | Akira Kai | 2019-06-25 |
| 10298771 | Intercom system | Seiya Yamakawa, Akira Kai | 2019-05-21 |