Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4521879 | Digital private branch exchange | Klaus Gueldenpfennig, Stanley L. Russell, William A. Oswald, Charles J. Breidenstein | 1985-06-04 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4521879 | Digital private branch exchange | Klaus Gueldenpfennig, Stanley L. Russell, William A. Oswald, Charles J. Breidenstein | 1985-06-04 |