US PATENT SUBCLASS 187 / 297
.~.~.~.~.~ Limited to power source (i.e., motor) utilizing D.C. power

Current as of: June, 1999
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187 /   HD   ELEVATOR, INDUSTRIAL LIFT TRUCK, OR STATIONARY LIFT FOR VEHICLE

250  DF  HAVING SPECIFIC LOAD SUPPORT DRIVE-MEANS OR ITS CONTROL {6}
276  DF  .~ Includes control for power source of drive-means {6}
277  DF  .~.~ With specific electrical component {9}
289  DF  .~.~.~ For electric power source {5}
293  DF  .~.~.~.~ Controls power source speed {4}
297.~.~.~.~.~ Limited to power source (i.e., motor) utilizing D.C. power

DEFINITION

Classification: 187/297

Limited to Power Source (i.e., motor) Utilizing D.C. Power:

(under subclass 293) Subject matter in which the force generating means regulated by the control* must specifically use a direct electric current.

SEE OR SEARCH CLASS

388, Electricity: Motor Control Systems, appropriate subclasses for a D.C. motor control which is not combined with, or limited to use solely with, an elevator.