Issued Patents 1994
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |