Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8638039 | Electronic ballast and method for providing a DC voltage component during lamp startup | Jun Kumagai, Nobuo Ukita, Kazuhiko Harada | 2014-01-28 |
| 8044601 | High voltage discharge lamp lighting device | Nobutoshi Matsuzaki, Hiroyasu Eriguchi, Takeshi Goriki, Takeshi Kamoi, Jun Kumagai +3 more | 2011-10-25 |