Randall Keith Roberts
36Patents
10h-index
56Co-inventors
78Inventor score
Filing activity: Jul 18, 1990 → Mar 7, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5652414A | Elevator active guidance system having a coordinated controller | Performing Operations; Transporting | 24 | Expired |
| US5329077A | Elevator ride quality | Performing Operations; Transporting | 20 | Expired |
| US5866861A | Elevator active guidance system having a model-based multi-input multi-output controller | Performing Operations; Transporting | 19 | Expired |
| US9359172B2 | Elevator rope sway detection and damping | Performing Operations; Transporting | 19 | Active |
| US5308938A | Elevator active suspension system | Performing Operations; Transporting | 19 | Expired |
| US5750945A | Active elevator hitch | Performing Operations; Transporting | 18 | Expired |
| US8136635B2 | Method and system for maintaining distance between elevator cars in an elevator system with multiple cars in a single hoistway | Performing Operations; Transporting | 18 | Active |
| US5814774A | Elevator system having a force-estimation or position-scheduled current command controller | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US8297412B2 | Elevator dispatching control for sway mitigation | Performing Operations; Transporting | 12 | Active |
| US5544721A | Method and apparatus for adjusting an elevator car based on stored horizontal displacement and acceleration information | Performing Operations; Transporting | 11 | Expired |
| US6216824A | Semi-active elevator hitch | Performing Operations; Transporting | 9 | Expired |
| US5524730A | Method and apparatus for storing sensed elevator horizontal displacement and acceleration signals | Performing Operations; Transporting | 8 | Expired |
| US9038783B2 | Rope sway mitigation via rope tension adjustment | Performing Operations; Transporting | 8 | Active |
| US8746411B2 | Elevator car positioning including gain adjustment based upon whether a vibration damper is activated | Performing Operations; Transporting | 8 | Active |
| US9010499B2 | Multi-car elevator hoistway separation assurance | Performing Operations; Transporting | 8 | Active |
| US9914619B2 | Elevator rope sway mitigation | Performing Operations; Transporting | 4 | Active |
| US9321610B2 | Frictional damper for reducing elevator car movement | Performing Operations; Transporting | 4 | Active |
| US10118802B2 | Structural health monitoring of an escalator drive system | Mechanical Engineering; Lighting; Heating | 4 | Active |
| US10035684B2 | Elevator component separation assurance system and method of operation | Performing Operations; Transporting | 4 | Active |
| US8360209B2 | Dynamic compensation during elevator car re-leveling | Performing Operations; Transporting | 4 | Active |
| US9546073B2 | Rope sway mitigation through control of access to elevators | Performing Operations; Transporting | 3 | Active |
| US10252879B2 | Brake operation management in elevators | Performing Operations; Transporting | 3 | Active |
| US8459415B2 | Elevator motion profile control including non-instantaneous transition between jerk values | Performing Operations; Transporting | 3 | Active |
| US10407275B2 | Detection and control system for elevator operations | Physics | 2 | Active |
| US9840395B2 | Multi-drive thrust manager for elevator control | Performing Operations; Transporting | 2 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.