Inventor
TEFFT ROBERT J
US4 patents
Patents
4 patentsUS6775602B2Aug 10, 2004
Method and system for vehicle emissions testing through on-board diagnostics unit inspection
GORDON DARBY SYSTEMS INC94 citations92
US7469171B2Dec 23, 2008
Method and system for vehicle emissions testing at a kiosk through on-board diagnostics unit inspection
GORDON DARBY SYSTEMS INC39 citations88
US6623975B1Sep 23, 2003
Method and system for vehicle emission testing
GORDON DARBY SYSTEMS INC35 citations88
US7071002B1Jul 4, 2006
Method and system for vehicle emission testing
GORDON DARBY SYSTEMS INC42 citations87