Issued Patents All Time
Showing 51–54 of 54 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5604786 | Telephone with unified features for hearing and deaf users | Robert M. Engelke, Kevin R. Colwell, Ronald W. Schultz | 1997-02-18 |
| 5581593 | Combination telephone and alphanumeric entry device | Robert M. Engelke, Kevin R. Colwell, Mark C. Terranova, Chuck Burk, Peter Fowler +5 more | 1996-12-03 |
| 5517548 | Telecommunication device operating under an enhanced TDD protocol | Robert M. Engelke, Kevin Colwell, Ronald W. Schultz, Jeffrey L. Hilliard | 1996-05-14 |
| 5432837 | Telecommunication device for the deaf with automatic transmission capability | Robert M. Engelke, Kevin Colwell, Ronald W. Schultz, Jeffrey L. Hilliard | 1995-07-11 |