Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5379337 | Method and system for providing emergency call service | Michael J. Castillo, Michael Jay Nelson, John R. Rice | 1995-01-03 |
| 5323444 | Emergency call system with call capacity/last chance routing feature | Douglas J. Ertz, Michael Jay Nelson | 1994-06-21 |