Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5438570 | Service observing equipment for signalling System Seven telephone network | Ernest Karras, Michael Joseph Hatlak | 1995-08-01 |
| 4849971 | Carrier telephone service analysis system | Ernest Karras, John M. Harrison | 1989-07-18 |