Inventor
COWAN DAVID E
US7 patents
⚠️ This page may combine multiple inventors who share the name “COWAN DAVID E”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
PLASTIC SAFETY SYSTEMS INC
4 patentsUS6182600B1Feb 6, 2001
Traffic channeling device
PLASTIC SAFETY SYSTEMS INC58 citations95
USD406543SMar 9, 1999
Traffic channelizer
PLASTIC SAFETY SYSTEMS INC31 citations92
US5421668AJun 6, 1995
Tread ballast or weight for temporary traffic control devices and posts
PLASTIC SAFETY SYSTEMS INC30 citations91
US6769207B1Aug 3, 2004
Portable sign assembly
PLASTIC SAFETY SYSTEMS INC10 citations73