| 4761807 |
Electronic audio communications system with voice authentication features |
Gordon H. Matthews, Michael L. Fannin |
1988-08-02 |
| 4757525 |
Electronic audio communications system with voice command features |
Gordon H. Matthews, Michael L. Fannin |
1988-07-12 |
| 4652700 |
Electronic audio communications system with versatile user accessibility |
Gordon H. Matthews, Michael L. Fannin |
1987-03-24 |
| 4640991 |
Electronic audio communications systems network |
Gordon H. Matthews, Michael L. Fannin |
1987-02-03 |
| 4602129 |
Electronic audio communications system with versatile message delivery |
Gordon H. Matthews, Michael L. Fannin |
1986-07-22 |
| 4585906 |
Electronic audio communication system with user controlled message address |
Gordon H. Matthews, Michael L. Fannin |
1986-04-29 |
| 4581486 |
Electronic audio communications system with user accessible message groups |
Gordon H. Matthews, Michael L. Fannin |
1986-04-08 |
| 4580012 |
Electronic audio communications system with automatic user access features |
Gordon H. Matthews, Michael L. Fannin |
1986-04-01 |
| 4371752 |
Electronic audio communication system |
Gordon H. Matthews, Michael L. Fannin |
1983-02-01 |