Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886334 | Optical amplifying repeater | — | 1989-12-12 |
| 4795286 | Pen tip structure | Tetsuo Shimoishi, Katsumi Otsuka | 1989-01-03 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886334 | Optical amplifying repeater | — | 1989-12-12 |
| 4795286 | Pen tip structure | Tetsuo Shimoishi, Katsumi Otsuka | 1989-01-03 |