Assignee
TECHCO CORP
US39 patents
Top patents by PatentIndex Score
US6370459B1Apr 9, 2002
Feedback and servo control for electric power steering systems
TECHCO CORP189 citations99
US6152254ANov 28, 2000
Feedback and servo control for electric power steering system with hydraulic transmission
TECHCO CORP159 citations99
US5307892AMay 3, 1994
Electronically controlled power steering system
TECHCO CORP153 citations99
US6119540ASep 19, 2000
Yoke apparatus for rack and pinion
TECHCO CORP60 citations96
US4956590ASep 11, 1990
Vehicular power steering system
TECHCO CORP87 citations96
US6142031ANov 7, 2000
Yoke apparatus for rack and pinion
TECHCO CORP43 citations93
US6122912ASep 26, 2000
Electro-hydraulic power steering systems having improved efficiency
TECHCO CORP48 citations93
US5931046AAug 3, 1999
Yoke apparatus for rack and pinion
TECHCO CORP32 citations93
US5845532ADec 8, 1998
Yoke apparatus for rack and pinion
TECHCO CORP25 citations93
US5802919ASep 8, 1998
Yoke apparatus for rack and pinion
TECHCO CORP25 citations93
US5791141AAug 11, 1998
Method and apparatus for reduction of fluid borne noise in hydraulic systems
TECHCO CORP27 citations93
US5755097AMay 26, 1998
Bootstrap power steering systems
TECHCO CORP43 citations93
US5718149AFeb 17, 1998
Yoke apparatus for rack and pinion
TECHCO CORP29 citations93
US5697216ADec 16, 1997
Method and apparatus for reduction of fluid borne noise in hydraulic systems
TECHCO CORP18 citations93
US5682745ANov 4, 1997
Bootstrap power steering systems
TECHCO CORP33 citations93
US5582006ADec 10, 1996
Method and apparatus for reduction of fluid borne noise in hydraulic systems
TECHCO CORP36 citations93
US5475976ADec 19, 1995
Method and apparatus for reduction of fluid borne noise in hydraulic systems
TECHCO CORP48 citations93
US5435698AJul 25, 1995
Bootstrap power steering systems
TECHCO CORP48 citations93
US5316043AMay 31, 1994
Preload mechanism for power steering apparatus
TECHCO CORP47 citations93
US5311906AMay 17, 1994
Preload mechanism for power steering apparatus
TECHCO CORP41 citations93
US5103715AApr 14, 1992
Power steering system
TECHCO CORP50 citations93
US5072650ADec 17, 1991
Power steering system with improved stability
TECHCO CORP29 citations93
US5775361AJul 7, 1998
Method and apparatus for enhancing stability in hydraulic flow control
TECHCO CORP9 citations74
US5660078AAug 26, 1997
Yoke apparatus for rack and pinion
TECHCO CORP17 citations74
US5577899ANov 26, 1996
Hydrostatically balanced gear pump
TECHCO CORP11 citations74
US5385329AJan 31, 1995
Method and apparatus for enhancing stability in hydraulic flow control
TECHCO CORP9 citations74
US5305604AApr 26, 1994
Control valve for bootstrap hydraulic systems
TECHCO CORP10 citations74
US5273072ADec 28, 1993
Flow passages for control valves
TECHCO CORP19 citations74
US5269215ADec 14, 1993
Control valves having parasitic leakage orifices
TECHCO CORP7 citations74
US5255715AOct 26, 1993
Control valve having parallel diversionary slots interconnected by flow selective control orifices
TECHCO CORP10 citations74
US5121054AJun 9, 1992
Method and apparatus for determining the angular velocity of a shaft using a pair of proximity sensors
TECHCO CORP9 citations74
US5059900AOct 22, 1991
Method and apparatus for determining the angular velocity of a shaft
TECHCO CORP14 citations74
US5505119AApr 9, 1996
Control valve having parasitic leakage orifices
TECHCO CORP6 citations63
US5353593AOct 11, 1994
Bootstrap hydraulic systems
TECHCO CORP2 citations63
US5345764ASep 13, 1994
Control valve for bootstrap hydraulic systems
TECHCO CORP5 citations63
US4922803AMay 8, 1990
Four-way valve
TECHCO CORP2 citations63
US5711345AJan 27, 1998
Method and apparatus for forming a control valve for hydraulic circuits
TECHCO CORP1 citations52
US5226290AJul 13, 1993
Bootstrap hydraulic systems
TECHCO CORP1 citations52
US5249420AOct 5, 1993
Control valve for bootstrap hydraulic systems
TECHCO CORP3 citations45