Inventor
NIPPERT ANDREW H
US13 patents
Patents
13 patentsUS5600237AFeb 4, 1997
Method and apparatus for determining the position of an armature in an electromagnetic actuator by measuring the driving voltage frequency
CATERPILLAR INC135 citations98
US5481187AJan 2, 1996
Method and apparatus for determining the position of an armature in an electromagnetic actuator
CATERPILLAR INC134 citations96
US5137254AAug 11, 1992
Pressure compensated flow amplifying poppet valve
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US5578904ANov 26, 1996
Method and apparatus for determining the position of an armature of an electromagnetic actuator in response to the magnitude and time derivative of the actuator coil current
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US6681571B2Jan 27, 2004
Digital controlled fluid translating device
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US6651545B2Nov 25, 2003
Fluid translating device
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US5856771AJan 5, 1999
Solenoid actuator assembly
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US5208570AMay 4, 1993
Solenoid construction and method for making same
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US6431050B1Aug 13, 2002
Apparatus for multiplexing a plurality of hydraulic cylinders
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US6389343B1May 14, 2002
Steering resistance device
CATERPILLAR INC47 citations91
US6739127B2May 25, 2004
Hydraulic system pump charging and recirculation apparatus
CATERPILLAR INC38 citations90
US5865156AFeb 2, 1999
Actuator which uses fluctuating pressure from an oil pump that powers a hydraulically actuated fuel injector
CATERPILLAR INC27 citations86
US5986530ANov 16, 1999
Solenoid and method for manufacturing
CATERPILLAR INC13 citations67