Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4860308 | Modem communication system having main and secondary channels | Johannes P. N. Haagh | 1989-08-22 |
| 4849989 | Data modem receiver | — | 1989-07-18 |
| 4849996 | Phase perturbation compensation system | — | 1989-07-18 |
| 4847880 | Multipoint modem system having fast synchronization | Timothy N. Doolittle | 1989-07-11 |