Inventor

JOHNSON DARRELL E

US3 patents

⚠️ This page may combine multiple inventors who share the name “JOHNSON DARRELL E”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

GE MED SYS INFORMATION TECH

1 patent

US6828910B2Dec 7, 2004

Apparatus for monitoring gas concentrations

GE MED SYS INFORMATION TECH62 citations90

SICK OPTIK ELEKTRONIK ERWIN

1 patent

US5341029AAug 23, 1994

Method for supervising a switch

SICK OPTIK ELEKTRONIK ERWIN10 citations68

HARSCO CORP

1 patent

US4779384AOct 25, 1988

Rail grinder

HARSCO CORP16 citations65