Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D303297 | Fluorescent lamp | Masashi Sangen | 1989-09-05 |
| D302733 | Compact self-ballasted fluorescent lamp | Masashi Sangen, Takeshi Matsumura | 1989-08-08 |
| 4841193 | Fluorescent lamp device with incandescent bulb type base cap | Masashi Sangen | 1989-06-20 |