Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6195003 | Fire alarming system | Nobuyuki Ichikawa, Eiji Hirooka, Keiichi Takahashi | 2001-02-27 |
| 6091328 | Fire alarming system | Nobuyuki Ichikawa, Eiji Hirooka, Keiichi Takahashi | 2000-07-18 |