Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888792 | Multi-level quadrature amplitude modulation and demodulation system | Takeshi Yagi | 1989-12-19 |
| 4846709 | Reinforced connection for a chemical connector and method of constructing therefor | Hideto Tachibana | 1989-07-11 |