Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6600255 | Coil filament structure for an incandescent lamp | Kenzo Kai, Katuhiko Miyahara, Hiroshi Sugahara | 2003-07-29 |
| 6465949 | Incandescent lamp filament | Katsuhiko Miahara, Hiroshi Sugahara, Masashi Dan, Yutaka Yamanizu | 2002-10-15 |