Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7738917 | Intercom/wireless door bell for multi-handset telephone system | Gordon Ryley, Ralph Tischler, Jagjit Grewal, Stephen Kropp | 2010-06-15 |
| 7062291 | Wireless multi-handset telephone system with integrated video monitoring accessories | Gordon Ryley, Ralph Tischler | 2006-06-13 |