Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5032000 | Gradient index-type optical device and process for production thereof | Seiichi Shingaki, Kohei Nakata, Takashi Serizawa, Haruo Tomono | 1991-07-16 |
| 4946724 | Vitreous film and heat-mode optical recording medium using same | Seiichi Shingaki, Yasuo Takahashi, Takashi Noma | 1990-08-07 |