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Class Information
Number: 187/297
Name: Elevator, industrial lift truck, or stationary lift for vehicle > Having specific load support drive-means or its control > Includes control for power source of drive-means > With specific electrical component > For electric power source > Controls power source speed > Limited to power source (i.e., motor) utilizing d.c. power
Description: Subject matter in which the force generating means regulated by the control* must specifically use a direct electric current.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7246686 |
Power supply for elevator systems having variable speed drives |
Jul. 24, 2007 |
| 7228942 |
Method for energy storage for DC motor powered load hoisting machinery |
Jun. 12, 2007 |
| 5969303 |
Emergency stop circuit for a direct current elevator drive |
Oct. 19, 1999 |
| 5909017 |
Elevator energy conservation system |
Jun. 1, 1999 |
| 5900597 |
Elevator controller/solid state drive interface |
May. 4, 1999 |
| 5070967 |
System for monitoring the operation of a cage moving in a mine shaft |
Dec. 10, 1991 |
| 4684856 |
Method and drive for elevator DC drive motor stabilization |
Aug. 4, 1987 |
| 4672277 |
Elevator motor control |
Jun. 9, 1987 |
| 4671390 |
Converter-powered drive for an elevator |
Jun. 9, 1987 |
| 4616733 |
Method and apparatus for reducing gear backlash impacts in an elevator system |
Oct. 14, 1986 |
| 4582174 |
Elevator system |
Apr. 15, 1986 |
| 4416352 |
Elevator system |
Nov. 22, 1983 |
| 4399892 |
Thyristor Leonard type elevator control system |
Aug. 23, 1983 |
| 4373610 |
Speed control apparatus for elevator |
Feb. 15, 1983 |
| 4307793 |
Elevator system |
Dec. 29, 1981 |
| 4284175 |
Emergency stop apparatus for electric elevators |
Aug. 18, 1981 |
| 4263988 |
Speed control system for a motor |
Apr. 28, 1981 |
| 4209082 |
Elevator control apparatus |
Jun. 24, 1980 |
| 4165801 |
Static Leonard system |
Aug. 28, 1979 |
| 4086983 |
Elevator control system |
May. 2, 1978 |
| 3938624 |
Transportation system with motor field control |
Feb. 17, 1976 |
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