Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7648307 | Underground structure cover | Tomokazu Hasegawa, Masakazu Hidaka, Norio Shinohara, Kenichi Koga, Kazumi Tanaka | 2010-01-19 |
| 6953301 | Lid assembly for facility access opening | Kenichi Koga, Kazumi Tanaka, Masakazu Hidaka | 2005-10-11 |