Issued Patents 2019
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10473274 | White light source system | Masahiko Yamakawa, Ryoji Tsuda, Yasumasa Ooya, Tatsunori Itoga, Junji Taniguchi | 2019-11-12 |
| 10378709 | Illumination system for reproducing the color temperature range of solar light for illuminating exhibits | Masahiko Yamakawa | 2019-08-13 |
| 10368408 | Light emitting device and LED light bulb | Hiroyasu Kondo, Masahiko Yamakawa, Ryoji Tsuda, Atsuji Nakagawa, Toshitaka Fujii +1 more | 2019-07-30 |
| 10368409 | Light emitting device and LED light bulb | Hiroyasu Kondo, Masahiko Yamakawa, Ryoji Tsuda, Atsuji Nakagawa, Toshitaka Fujii +1 more | 2019-07-30 |