Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6661116 | Battery switching device and emergency alerting system comprising this | — | 2003-12-09 |
| 6642719 | Device for judging life of auxiliary battery | — | 2003-11-04 |
| 6587040 | Emergency call system provided with theftproof function | — | 2003-07-01 |
| 6304171 | Emergency call system with battery switching function | — | 2001-10-16 |