Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8283834 | Power generating apparatus having ball bearings | Naoteru Matsubara, Yohko Naruse, Hitoshi Hirano, Makoto Izumi | 2012-10-09 |
| 8212450 | Generator including an electret member | Makoto Izumi | 2012-07-03 |
| 8164231 | Electret device comprising electret film formed on main surface of substrate and electrostatic operating apparatus | — | 2012-04-24 |
| 7956497 | Electret device and electrostatic induction conversion apparatus comprising the same | Yoshiki Murayama, Naoteru Matsubara | 2011-06-07 |
| 7525205 | Electric power generator | Hitoshi Hirano, Yoshiki Murayama, Naoteru Matsubara, Hideaki Miyamoto, Makoto Izumi +1 more | 2009-04-28 |