Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6309142 | Structure for preventing frost heave damage to an underground structure and a method of installing the same | Kazuo Takeda, Juichi Nakazawa, Akiyoshi Otobe | 2001-10-30 |
| 5460570 | Ventilator for elevator cage | Hideya Kohara, Katsuyoshi Nagayasu | 1995-10-24 |