Inventor
LIEBERT KARL-HEINZ
20 patents
Patents
20 patentsUS4553389ANov 19, 1985
Hydrostatic auxiliary steering apparatus
ZAHNRADFABRIK FRIEDRICHSHAFEN27 citations92
US4174018ANov 13, 1979
Arrangement for control of two hydraulic pressure systems, including booster steering control
ZAHNRADFABRIK FRIEDRICHSHAFEN37 citations92
US4553390ANov 19, 1985
Hydrostatic steering arrangement
ZAHNRADFABRIK FRIEDRICHSHAFEN10 citations73
US4354350AOct 19, 1982
Hydrostatic auxiliary power steering
ZAHNRADFABRIK FRIEDRICHSHAFEN7 citations73
US4258902AMar 31, 1981
Steering valve with annular sealing element for radial annular gap
ZAHNRADFABRIK FRIEDRICHSHAFEN7 citations73
US4184332AJan 22, 1980
Hydrostatic two-circuit steering arrangement
ZAHNRADFABRIK FRIEDRICHSHAFEN9 citations73
US4174612ANov 20, 1979
Pressure agent control arrangements, especially for hydraulic steering arrangements for motor vehicles
ZAHNRADFABRIK FRIEDRICHSHAFEN8 citations73
US4023363AMay 17, 1977
Auxiliary power steering systems for heavy duty vehicles
ZAHNRADFABRIK FRIEDRICHSHAFEN15 citations73
US4618017AOct 21, 1986
Hydraulic auxiliary power steering for motor vehicles
ZAHNRADFABRIK FRIEDRICHSHAFEN12 citations66
US3989120ANov 2, 1976
Power steering with variable volume servo control
ZAHNRADFABRIK FRIEDRICHSHAFEN4 citations63
US4495769AJan 29, 1985
Booster power steering
ZAHNRADFABRIK FRIEDRICHSHAFEN3 citations62
US4355505AOct 26, 1982
Rotatable controller valve
ZAHNRADFABRIK FRIEDRICHSHAFEN3 citations62
US4295805AOct 20, 1981
Hydraulic rotary toothed piston engine with flow through the toothed gaps
ZAHNRADFABRIK FRIEDRICHSHAFEN2 citations62
US4290738ASep 22, 1981
Steering valve with spring torsion rod
ZAHNRADFABRIK FRIEDRICHSHAFEN4 citations62
US4258752AMar 31, 1981
Control valve with two rotary valve elements supported in a housing and acted upon axially by pressure
ZAHNRADFABRIK FRIEDRICHSHAFEN5 citations62
US4221159ASep 9, 1980
Pressure medium control device for hydrostatic steering systems of motor vehicles
ZAHNRADFABRIK FRIEDRICHSHAFEN2 citations62
US4344283AAug 17, 1982
Hydrostatic auxiliary power steering
ZAHNRADFABRIK FRIEDRICHSHAFEN3 citations56
US4237773ADec 9, 1980
Pressure medium controller for motor vehicle steering systems
ZAHNRADFABRIK FRIEDRICHSHAFEN3 citations54
US4466243AAug 21, 1984
Hydrostatic power steering system with curved valve return springs
ZAHNRADFABRIK FRIEDRICHSHAFEN1 citations52
US4395877AAug 2, 1983
Hydrostatic steering system for motor vehicles
ZAHNRADFABRIK FRIEDRICHSHAFEN0 citations41