|
| US5319351 | 22 okt 1992 | 7 jun 1994 | | Stolen vehicle alarm system and method |
| US5548810 | 30 mar 1994 | 20 aug 1996 | Safe Pursuit, Inc. | Hands-free two-way radio communication system |
| US5576716 | 7 dec 1994 | 19 nov 1996 | | Owner oriented system for locating lost or stolen property |
| US5925087 | 27 aug 1993 | 20 jul 1999 | Hitachi, Ltd. | Method and apparatus for eliminating noise in a slope estimation arrangement for a motor vehicle |
| US6353383 | 15 dec 2000 | 5 mar 2002 | | Alarm apparatus for monitoring activity in a vehicle |
| US7068795 | 16 apr 2003 | 27 jun 2006 | Digital Recorders, Inc. | Public address system and method for an urban transit vehicle |
| US7786848 | 22 maj 2006 | 31 aug 2010 | Directed Electronics Inc. | Vehicle security systems |
