Inventor
KULAK RICHARD E
US41 patents
Patents
41 patentsUS6446759B1Sep 10, 2002
Door coupler and latch system for elevator car and landing doors
OTIS ELEVATOR CO61 citations96
US6296080B1Oct 2, 2001
Variable traction mechanism for rotary actuated overspeed safety device
OTIS ELEVATOR CO21 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
US5139112AAug 18, 1992
Elevator car door lock
OTIS ELEVATOR CO22 citations91
US5819877AOct 13, 1998
Elevator evacuation deterrent device
OTIS ELEVATOR CO45 citations88
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
US11034548B2Jun 15, 2021
Elevator door interlock assembly
OTIS ELEVATOR CO2 citations73
US10710843B2Jul 14, 2020
Car door interlock with sill lock
OTIS ELEVATOR CO2 citations73
US10569994B2Feb 25, 2020
Monitoring system, elevator door system having monitoring system, and method
OTIS ELEVATOR CO4 citations73
US6457569B2Oct 1, 2002
Rotary actuated overspeed safety device
OTIS ELEVATOR CO12 citations73
US5862887AJan 26, 1999
High performance linear induction motor door operator
OTIS ELEVATOR CO15 citations73
US5482142AJan 9, 1996
Quiet elevator rotary gate switch
OTIS ELEVATOR CO3 citations63
US11795033B2Oct 24, 2023
Elevator car door interlock
OTIS ELEVATOR CO0 citations62
US11661315B2May 30, 2023
Monitoring system, elevator door system having monitoring system, and method
OTIS ELEVATOR CO0 citations62
US11655122B2May 23, 2023
Elevator door in interlock assembly
OTIS ELEVATOR CO0 citations62
US11124389B2Sep 21, 2021
Elevator car door interlock
OTIS ELEVATOR CO0 citations62
US11046557B2Jun 29, 2021
Elevator door interlock assembly
OTIS ELEVATOR CO1 citations62
US11040858B2Jun 22, 2021
Elevator door interlock assembly
OTIS ELEVATOR CO1 citations62
US10882720B2Jan 5, 2021
Elevator car door interlock
OTIS ELEVATOR CO0 citations62
US5880414AMar 9, 1999
Elevator door brake, brake, lock, and hold-open
OTIS ELEVATOR CO6 citations62
US5207298AMay 4, 1993
Elevator rotary door interlock
OTIS ELEVATOR CO2 citations58
US5203431AApr 20, 1993
Elevator rotary lost door interlock
OTIS ELEVATOR CO3 citations58
US11254542B2Feb 22, 2022
Car door interlock
OTIS ELEVATOR CO0 citations52
US11247872B2Feb 15, 2022
Elevator car door interlock
OTIS ELEVATOR CO0 citations52
US10486940B2Nov 26, 2019
Alignment system for an elevator car
OTIS ELEVATOR CO0 citations42