Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868850 | MODEM communication system having training means and method for training same | Yasuhiro Arai | 1989-09-19 |
| 4799214 | Two-wire full duplex frequency division multiplex modem system having echo cancellation means | — | 1989-01-17 |