Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6643270 | Method of compensating for systemic impairments in a telecommunications network | Frederic J. Hirzel | 2003-11-04 |
| 6633604 | Method of improving echo canceller training in modems and of discovering characteristics of a PCM channel | Frederic J. Hirzel | 2003-10-14 |