| Patent Number |
Title Of Patent |
Date Issued |
| 7374020 |
Energy efficient elevator system |
May 20, 2008 |
| The invention is directed to an apparatus and methods for enhancing the energy efficiency of a variable speed drive (VSD) used to control an elevator by disconnecting the VSD from the AC power supply grid when the elevator is idle and reconnecting the VSD when the elevator becomes ac |
| 7360630 |
Elevator positioning system |
April 22, 2008 |
| The present invention provides an elevator position compensation system which minimizing the re-leveling of an elevator car in an elevator shaft. The elevator car is suspended in the shaft by an elevator cable system and elevator motor, wherein the elevator position compensation system |
| 7334665 |
Interlock wiring communication system for elevators |
February 26, 2008 |
| The systems and methods of present invention invoke an elevator communication system for providing communication between a plurality of hall fixture devices and at least one elevator system controller. The elevator communication system includes at least one elevator door interlock wi |
