Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6049446 | Alarm systems and devices incorporating current limiting circuit | Simon Ha | 2000-04-11 |
| 5850178 | Alarm system having synchronizing pulse generator and synchronizing pulse missing detector | Simon Ha | 1998-12-15 |