Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7091870 | Security system and method of security service business | Hirofumi Tsutsumi, Seiji Tanaka, Yoshihiro Nishikawa, Yasuaki Takada, Toshihiko Ohta +3 more | 2006-08-15 |
| 6940067 | Hazardous material detection system | Seiji Tanaka, Hiroyuki Fujita, Toshio Iwasaki, Yoshihiro Nishikawa | 2005-09-06 |
| 6806450 | Hazardous material detection system | Seiji Tanaka, Hiroyuki Fujita, Toshio Iwasaki, Yoshihiro Nishikawa | 2004-10-19 |