Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Door operator assembly with motorized rollers

Door operator assembly with motorized rollers

US Patent 6543581 · Granted Apr 8, 2003

Estimated economic value: $30,344,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Elevator access systems for elevators2023
Elevator car with working platform stabilization2022
Machine mounting structure for elevator system2021
Elevator overtravel testing systems and methods2021
Elevator system hoistway access control2021
Elevator control system and elevator system having inspection control station2020
Monitored braking blocks2020
Optoelectronic device comprising three-dimensional semiconductor elements, and m2019
Building settling detection2019
Locking system for trap or panels of an elevator car and method of controlling a2019
Control method for breaking an electric motor2019
Apparatus and means for starting of AC motors, algorithm for self-adapting motor2017