Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4728779 | PTC heating device | Michikazu Takeuchi, Sumihiro Yasuda, Kengo OGAWA | 1988-03-01 |
| 4544829 | Electric soldering iron having a PTC heating element | Shichiro Adachi | 1985-10-01 |
| 4468555 | Electric soldering iron having a PTC heating element | Shichiro Adachi | 1984-08-28 |