Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4939771 | Attendant-controlled call message delivery system and method | Percy B. Brown, Nga V. Chau, Tung-Hai Hsiao, Georg K. Karawas, Richard E. LeCronier +4 more | 1990-07-03 |