Inventor
SIMPSON ROGER T
US63 patents
⚠️ This page may combine multiple inventors who share the name “SIMPSON ROGER T”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
BORGWARNER INC
30 patentsUS6322468B1Nov 27, 2001
Pressure relief valve and dual path vent disc for hydraulic tensioner
BORGWARNER INC150 citations97
US6311655B1Nov 6, 2001
Multi-position variable cam timing system having a vane-mounted locking-piston device
BORGWARNER INC95 citations97
US6631779B2Oct 14, 2003
On demand vehicle drive system
BORGWARNER INC39 citations96
US6374787B2Apr 23, 2002
Multi-position variable camshaft timing system actuated by engine oil pressure
BORGWARNER INC58 citations96
US6263995B1Jul 24, 2001
On demand vehicle drive system
BORGWARNER INC64 citations96
US6250265B1Jun 26, 2001
Variable valve timing with actuator locking for internal combustion engine
BORGWARNER INC73 citations96
US6247434B1Jun 19, 2001
Multi-position variable camshaft timing system actuated by engine oil
BORGWARNER INC55 citations96
US6244981B1Jun 12, 2001
Hydraulic tensioner with pawl-style external rack
BORGWARNER INC80 citations96
US6196939B1Mar 6, 2001
Hydraulic tensioner with a hydraulically controlled rack
BORGWARNER INC59 citations96
US6263846B1Jul 24, 2001
Control valve strategy for vane-type variable camshaft timing system
BORGWARNER INC65 citations95
US6120402ASep 19, 2000
Hydraulic tensioner with external rack having backlash restriction
BORGWARNER INC78 citations95
US6481402B1Nov 19, 2002
Variable camshaft timing system with pin-style lock between relatively oscillatable components
BORGWARNER INC54 citations93
US6382155B2May 7, 2002
Variable valve timing with actuator locking for internal combustion engine
BORGWARNER INC19 citations93
US6312351B1Nov 6, 2001
Hydraulic tensioner with pivotal mount
BORGWARNER INC19 citations93
US6283076B1Sep 4, 2001
Torsionally compliant sprocket for engine balance shaft drive and method of manufacture
BORGWARNER INC51 citations93
US6165090ADec 26, 2000
Hydraulic tensioner with vent formed with stacked plates
BORGWARNER INC22 citations93
US6139454AOct 31, 2000
Hydraulic tensioner with plastic cap check valve or vent
BORGWARNER INC30 citations93
US6126563AOct 3, 2000
Quick purge tensioner with internal piston spring
BORGWARNER INC38 citations93
US6117033ASep 12, 2000
Hydraulic tensioner with tuned spring piston
BORGWARNER INC41 citations93
US7497297B2Mar 3, 2009
On demand vehicle drive system
BORGWARNER INC14 citations92
US7137371B2Nov 21, 2006
Phaser with a single recirculation check valve and inlet valve
BORGWARNER INC26 citations92
US6634973B1Oct 21, 2003
Hydraulic tensioner with two spring biased pistons and cushioned pull-back rack
BORGWARNER INC49 citations92
US6435154B1Aug 20, 2002
VCT controls integrated into front cover of engine
BORGWARNER INC33 citations92
US6234127B1May 22, 2001
Torsionally compliant and damped sprocket system with position stops
BORGWARNER INC45 citations92
US6612952B1Sep 2, 2003
Blade tensioner having spring blade cantilevered from distal end of arm
BORGWARNER INC49 citations90
US7255077B2Aug 14, 2007
CTA phaser with proportional oil pressure for actuation at engine condition with low cam torsionals
BORGWARNER INC10 citations84
US7225770B2Jun 5, 2007
Electromagnetic actuator having inherently decelerating actuation between limits
BORGWARNER INC11 citations84
US7214153B2May 8, 2007
Method of changing the duty cycle frequency of a PWM solenoid on a CAM phaser to increase compliance in a timing drive
BORGWARNER INC14 citations84
US6840202B2Jan 11, 2005
Method to reduce noise of a cam phaser by controlling the position of center mounted spool valve
BORGWARNER INC16 citations84
US6623390B2Sep 23, 2003
Hydraulic tensioner with pivotal mount
BORGWARNER INC14 citations84
BORG WARNER AUTOMOTIVE
18 patentsUS5707309AJan 13, 1998
Hydraulic tensioner with modular inlet check valve with pressure relief
BORG WARNER AUTOMOTIVE98 citations98
US5700213ADec 23, 1997
Integral inlet and pressure relief valve for an automotive tensioner
BORG WARNER AUTOMOTIVE109 citations98
US5407024AApr 18, 1995
On demand vehicle drive system
BORG WARNER AUTOMOTIVE312 citations98
US5967921AOct 19, 1999
Hydraulic chain tensioner with molded plastic body
BORG WARNER AUTOMOTIVE92 citations96
US5609219AMar 11, 1997
On demand vehicle drive system
BORG WARNER AUTOMOTIVE38 citations96
US5485894AJan 23, 1996
On demand vehicle drive system
BORG WARNER AUTOMOTIVE36 citations96
US5492194AFeb 20, 1996
On demand vehicle drive system
BORG WARNER AUTOMOTIVE64 citations95
US5951423ASep 14, 1999
Mechanical friction tensioner
BORG WARNER AUTOMOTIVE50 citations93
US5700216ADec 23, 1997
Hydraulic tensioner for dual chain system
BORG WARNER AUTOMOTIVE34 citations93
US5653652AAug 5, 1997
Hydraulic tensioning system with dual arm blade
BORG WARNER AUTOMOTIVE34 citations93
US5619887AApr 15, 1997
Camshaft tuned vibration damper
BORG WARNER AUTOMOTIVE24 citations93
US5462493AOct 31, 1995
Dual blade chain tensioner with damping
BORG WARNER AUTOMOTIVE51 citations93
US5989139ANov 23, 1999
Hydraulic tensioner with external rack
BORG WARNER AUTOMOTIVE55 citations92
US5967920AOct 19, 1999
Hydraulic tensioner with a bore cup
BORG WARNER AUTOMOTIVE41 citations92
US5655416AAug 12, 1997
Torsional absorber for camshaft sprockets
BORG WARNER AUTOMOTIVE32 citations92
US5628701AMay 13, 1997
Hydraulic tensioner with sealing element
BORG WARNER AUTOMOTIVE23 citations92
US5579665ADec 3, 1996
Torsional absorber for camshaft sprockets
BORG WARNER AUTOMOTIVE23 citations92
US5605201AFeb 25, 1997
On demand vehicle drive system
BORG WARNER AUTOMOTIVE26 citations91
SIMPSON ROGER T
2 patentsShowing the top 50 of 63 patents by PatentIndex Score.