Issued Patents All Time
Showing 76–89 of 89 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6493426 | Relay for personal interpreter | Robert M. Engelke, Troy Vitek, Kurt M. Gritner | 2002-12-10 |
| 6307921 | Text enhanced telephony | Robert M. Engelke | 2001-10-23 |
| 6075842 | Text enhanced telephony | Robert M. Engelke | 2000-06-13 |
| 5978654 | Alphanumeric paging entry system | Robert M. Engelke | 1999-11-02 |
| 5974116 | Personal interpreter | Robert M. Engelke | 1999-10-26 |
| 5809425 | Gateway for low cost alphanumeric paging entry system | Robert M. Engelke | 1998-09-15 |
| 5724405 | Text enhanced telephony | Robert M. Engelke | 1998-03-03 |
| 5604786 | Telephone with unified features for hearing and deaf users | Robert M. Engelke, Ronald W. Schultz, Troy Vitek | 1997-02-18 |
| 5581593 | Combination telephone and alphanumeric entry device | Robert M. Engelke, Troy Vitek, Mark C. Terranova, Chuck Burk, Peter Fowler +5 more | 1996-12-03 |
| D364865 | Text telephone | Robert M. Engelke, Ronald W. Schultz, Robert Schoenbeck | 1995-12-05 |
| 5081673 | Voice bridge for relay center | Robert M. Engelke | 1992-01-14 |
| 4959847 | Telecommunications device with automatic code detection and switching | Robert M. Engelke | 1990-09-25 |
| 4897868 | Public terminal receptacle | Robert M. Engelke, Rodney D. Borst | 1990-01-30 |
| 4777469 | Public terminal receptacle | Robert M. Engelke, Rodney D. Borst | 1988-10-11 |