Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5740234 | Telephone call monitoring method and apparatus | James E. Black, Jr., Brian Freeman, Donald M. Gerth, Richard Jordan, Steven T. Kaish +6 more | 1998-04-14 |
| 4905274 | Key telephone management system | James R. Hahn, III, William H. Havanas, Mark A. Martinka | 1990-02-27 |
| 4866763 | Interexchange carrier automatic route selection system | William H. Havanas, Thomas R. Lanning, Mark A. Martinka | 1989-09-12 |