Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D772836 | Telecommunication device | Robert M. Engelke, Troy Vitek, Peter Kirschhoffer | 2016-11-29 |
| D763219 | Telecommunication device | Robert M. Engelke, Troy Vitek, Peter Kirschhoffer | 2016-08-09 |
| 6075841 | In-line text display for telephone terminal employing data filtering | Robert M. Engelke, Ronald W. Schultz, Troy Vitek | 2000-06-13 |
| 5517548 | Telecommunication device operating under an enhanced TDD protocol | Robert M. Engelke, Ronald W. Schultz, Jeffrey L. Hilliard, Troy Vitek | 1996-05-14 |
| 5432837 | Telecommunication device for the deaf with automatic transmission capability | Robert M. Engelke, Ronald W. Schultz, Jeffrey L. Hilliard, Troy Vitek | 1995-07-11 |
| 5351288 | Voice bridge for a relay center | Robert M. Engelke, Edward T. Gisske, Ronald W. Schultz | 1994-09-27 |
| 5327479 | Telecommunication device for the deaf with interrupt and pseudo-duplex capability | Robert M. Engelke, Ronald W. Schultz | 1994-07-05 |
| 5325417 | Telecommunication device for the deaf with automatic self-identification | Robert M. Engelke, Ronald W. Schultz | 1994-06-28 |