Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7543755 | Electronic key, electronic locking apparatus, electronic security system, and key administering server | Kenji Doi, Takashi Nishiyama, Ryouji Nakajima, Masaru Hashimoto, Kenshi Suzuki +1 more | 2009-06-09 |
| 6864780 | Data transmission system using a human body as a signal transmission path | Kenji Doi, Masaru Hashimoto, Masaki Koyama, Yoshiko Suzuki | 2005-03-08 |