Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5579369 | Facility type determination technique | Burton R. Saltzberg | 1996-11-26 |
| 5363441 | Technique for reducing echoes in conference communications | Gi-Hong Im, Joseph G. Kneuer, Burton R. Saltzberg, Jean-Jacques Werner | 1994-11-08 |
| 4633041 | Station set directory assistance arrangement | Richard H. Boivie, Michele S. Rabinowitz, Rickens T. Szeto, Barry J. Weinbaum | 1986-12-30 |
| 4228323 | Variable loop length compensated barrier circuit | Chao Liu, Sigurd G. Waaben | 1980-10-14 |
| 4219701 | Tone generating hold impedance circuit for key telephone line circuits | — | 1980-08-26 |
| 4190747 | Signal corrected optocoupled device | Chao Liu, Sigurd G. Waaben | 1980-02-26 |