Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7417540 | Wireless linking of smoke/CO detection units | Derek Johnston | 2008-08-26 |
| 7009521 | Power supply and interconnect detector system | Romualdo Sonny Siazon, Kenneth L. Venzant, Derek Johnston | 2006-03-07 |
| 6970077 | Environmental condition alarm with voice enunciation | Derek Scott Johnson, Michael A. Swieboda | 2005-11-29 |
| 6731207 | Modular detector system | Michael A. Swieboda, Mark A. Devine, Andrew J. Ivanecky, Kenneth L. Venzant, Derek Johnston +1 more | 2004-05-04 |