Inventor
HOLLOWELL RICHARD L
US19 patents
⚠️ This page may combine multiple inventors who share the name “HOLLOWELL RICHARD L”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
OTIS ELEVATOR CO
18 patentsUS5294757AMar 15, 1994
Active vibration control system for an elevator, which reduces horizontal and rotational forces acting on the car
OTIS ELEVATOR CO54 citations96
US6419208B1Jul 16, 2002
Elevator sheave for use with flat ropes
OTIS ELEVATOR CO47 citations92
US5931265AAug 3, 1999
Rope climbing elevator
OTIS ELEVATOR CO28 citations92
US5439075AAug 8, 1995
Elevator active suspension system
OTIS ELEVATOR CO36 citations92
US5368132ANov 29, 1994
Suspended elevator cab magnetic guidance to rails
OTIS ELEVATOR CO25 citations92
US5322144AJun 21, 1994
Active control of elevator platform
OTIS ELEVATOR CO33 citations92
US5321217AJun 14, 1994
Apparatus and method for controlling an elevator horizontal suspension
OTIS ELEVATOR CO37 citations92
US5308938AMay 3, 1994
Elevator active suspension system
OTIS ELEVATOR CO30 citations92
US6742769B2Jun 1, 2004
Elevator sheave for use with flat ropes
OTIS ELEVATOR CO23 citations91
US6193016B1Feb 27, 2001
Dual sheave rope climber using flat flexible ropes
OTIS ELEVATOR CO39 citations89
US8047335B2Nov 1, 2011
Shock absorbing hitch
OTIS ELEVATOR CO10 citations83
US7878306B2Feb 1, 2011
Elevator system without a moving counterweight
OTIS ELEVATOR CO8 citations83
US5400872AMar 28, 1995
Counteracting horizontal accelerations on an elevator car
OTIS ELEVATOR CO15 citations74
US11970369B2Apr 30, 2024
Beam climber battery charging in transfer station
OTIS ELEVATOR CO1 citations62
US11738971B2Aug 29, 2023
Elevator governor tension frame damper
OTIS ELEVATOR CO0 citations62
US11434107B2Sep 6, 2022
Rope-climbing self propelled elevator system
OTIS ELEVATOR CO0 citations61
US10399820B2Sep 3, 2019
Elevator tension member stiffness estimation and monitoring
OTIS ELEVATOR CO1 citations59
US10875743B2Dec 29, 2020
Rope-climbing self propelled elevator system
OTIS ELEVATOR CO0 citations51