Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7738917 | Intercom/wireless door bell for multi-handset telephone system | Gordon Ryley, Ralph Tischler, Allan Chi-Yun Wong, Jagjit Grewal | 2010-06-15 |
| 5852774 | Sidetone level reduction circuit and method | — | 1998-12-22 |