Inventor
HE THOMAS
US29 patents
⚠️ This page may combine multiple inventors who share the name “HE THOMAS”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
OTIS ELEVATOR CO
26 patentsUS5929399AJul 27, 1999
Automatic open loop force gain control of magnetic actuators for elevator active suspension
OTIS ELEVATOR CO35 citations92
US5864102AJan 26, 1999
Dual magnet controller for an elevator active roller guide
OTIS ELEVATOR CO22 citations92
US5736693AApr 7, 1998
Elevator door drive using dual secondary linear induction motor
OTIS ELEVATOR CO25 citations92
US5732796AMar 31, 1998
Elevator car evacuation deterrent device
OTIS ELEVATOR CO29 citations92
US5651427AJul 29, 1997
Elevator door coupling and hold-close apparatus
OTIS ELEVATOR CO21 citations92
US5651428AJul 29, 1997
Stationary actuator moving vane elevator car door coupling
OTIS ELEVATOR CO27 citations92
US5612518AMar 18, 1997
Linear induction motor door drive assembly for elevators
OTIS ELEVATOR CO22 citations92
US5509504AApr 23, 1996
Velocity regulated, open current loop, variable voltage, variable frequency, linear induction motor drive for an elevator car door
OTIS ELEVATOR CO20 citations92
US5503248AApr 2, 1996
Maintaining open loop current drive to linear induction motor
OTIS ELEVATOR CO23 citations92
US5454447AOct 3, 1995
Elevator hoistway door bolt lock
OTIS ELEVATOR CO22 citations92
US5487449AJan 30, 1996
Magnetic elevator door coupling
OTIS ELEVATOR CO40 citations91
US6943508B2Sep 13, 2005
Tubular linear synchronous motor control for elevator doors
OTIS ELEVATOR CO12 citations81
US6305502B1Oct 23, 2001
Elevator cab floor acceleration control system
OTIS ELEVATOR CO19 citations77
US5808246ASep 15, 1998
Triac drive for three-phase line-powered linear induction motor elevator door operator
OTIS ELEVATOR CO15 citations74
US5682023AOct 28, 1997
Time-optimal control of an AC line-driven linear motor elevator door operator
OTIS ELEVATOR CO9 citations74
US5669465ASep 23, 1997
Elevator hoistway door bolt lock
OTIS ELEVATOR CO8 citations74
US5668355ASep 16, 1997
Elevator cab door drive system
OTIS ELEVATOR CO13 citations74
US5538106AJul 23, 1996
Rotationally stiff elevator car door coupling
OTIS ELEVATOR CO18 citations74
US5495918AMar 5, 1996
Smooth and quiet linear induction motor elevator door operation
OTIS ELEVATOR CO15 citations74
US5494137AFeb 27, 1996
Elevator door mounting system
OTIS ELEVATOR CO12 citations74
US5485896AJan 23, 1996
Rotary elevator car door coupling
OTIS ELEVATOR CO9 citations74
US5435415AJul 25, 1995
Cammed wedge elevator car door coupling
OTIS ELEVATOR CO10 citations74
US7202615B2Apr 10, 2007
Tubular linear synchronous motor control for elevator doors
OTIS ELEVATOR CO6 citations71
US6435314B1Aug 20, 2002
Elevator platform stabilization coupler
OTIS ELEVATOR CO9 citations69
US6431325B1Aug 13, 2002
Acceleration control system utilizing elevator platform stabilization coupler
OTIS ELEVATOR CO9 citations69
US5880414AMar 9, 1999
Elevator door brake, brake, lock, and hold-open
OTIS ELEVATOR CO6 citations62