Inventor
KELLER HELMUT
DE14 patents
⚠️ This page may combine multiple inventors who share the name “KELLER HELMUT”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
BOSCH GMBH ROBERT
3 patentsUS3930304AJan 6, 1976
Method and apparatus for selective burnout trimming of integrated circuit units
BOSCH GMBH ROBERT67 citations95
US4054828AOct 18, 1977
Cyclically operating transistorized power switching circuit system
BOSCH GMBH ROBERT40 citations92
US3987392AOct 19, 1976
Luminescent voltage indicator circuit
BOSCH GMBH ROBERT32 citations80
WELLA AG
3 patentsUS5409503AApr 25, 1995
Oxidation hair dye with a content of 5-aminophenyl derivatives, process for oxidative dyeing of hair and new 5-aminophenol derivatives
WELLA AG20 citations92
US5865856AFeb 2, 1999
2, 5-diaminobenzonitrile compounds and oxidation hair dye compositions containing same
WELLA AG3 citations61
US5935562AAug 10, 1999
Permanent process and agent
WELLA AG0 citations47