Assignee
ERNST ALFRED
7 patents
Top patents by PatentIndex Score
US5309754AMay 10, 1994
Hardness tester and method for measuring the hardness of metallic materials
ERNST ALFRED28 citations91
US4444045AApr 24, 1984
Hand-operated hardness meter
ERNST ALFRED9 citations72
US4262525AApr 21, 1981
Hardness testing apparatus provided with a safety stop device
ERNST ALFRED8 citations72
US4107978AAug 22, 1978
Durometer according to Rockwell system
ERNST ALFRED9 citations72
US4023401AMay 17, 1977
Hand-operable durometer
ERNST ALFRED13 citations72
US4899578AFeb 13, 1990
Driving device for a hardness measuring instrument
ERNST ALFRED4 citations61
US4182162AJan 8, 1980
Durometer
ERNST ALFRED1 citations50