Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4827475 | Transmitting a digital signal and an additional signal | Wayne D. Grover | 1989-05-02 |
| 4816826 | Digital telephone switching system having a message switch with address translation | Mahmood Sultan, Youssef A. Geadah | 1989-03-28 |