Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6195003 | Fire alarming system | Eiji Hirooka, Keiichi Takahashi, Kenji Takeyoshi | 2001-02-27 |
| 6091328 | Fire alarming system | Eiji Hirooka, Keiichi Takahashi, Kenji Takeyoshi | 2000-07-18 |
| 5929988 | Particulate detecting sensor employing parallel light | — | 1999-07-27 |
| 5694208 | Sensor for detecting fine particles such as smoke or dust contained in the air | — | 1997-12-02 |