Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5994823 | High-pressure discharge lamp, turning-on circuit device, and lighting fixture | Kazuyoshi Okamura, Takayuki Aoki | 1999-11-30 |
| 5668440 | Nitride layer for discharge lamps | Shinji Inukai, Kazuo Takita, Makoto Nishizawa, Akira Itoh, Kazuyoshi Okamura +4 more | 1997-09-16 |
| 5276385 | High-pressure discharge lamp and lighting method | Akira Itoh, Kazuyoshi Okamura, Mitsuho Kotabe, Hirochika Shiohama, Kimihito Sato +2 more | 1994-01-04 |
| D334071 | Sodium lamp | Akira Itoh, Kazuyoshi Okamura | 1993-03-16 |
| 5182486 | Ceramic electric-discharge lamp incorporating arc tube having at least two curved regions | Akira Itoh, Kazuyoshi Okamura | 1993-01-26 |
| 4950953 | High pressure sodium lamp with sodium amalgam of controlled amount sealed therein | Akira Ito, Kazuyoshi Okamura | 1990-08-21 |
| 4910430 | High pressure sodium lamp substantially preventing movement of melted sodium-mercury amalgam during use | Akira Ito, Kenji Araki | 1990-03-20 |