Patents by Inventor Nelson L. Stoldt

Nelson L. Stoldt has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Vehicle for materials handling and other industrial uses
    Patent number: 7318580
    Abstract: A heavy duty wheeled vehicle for an industrial environment is electrically driven by one or more switched reluctance motor traction drive system connected to the wheels. The switched reluctance motors are powered by an electrical generator that is driven by an engine, such as a diesel engine, which may run at a substantially constant RPM. A digital control system provides operator displays and controls power conversion from the generator, as well as providing maintenance and control functions for the switched reluctance motors. A heavy-duty hoisting apparatus electrically drives a hoisting mechanism using an SR motor, providing power for lifting a load. The heavy-duty hoisting apparatus may include an engine and generator or provide power to the SR motor from an external source.
    Type: Grant
    Filed: March 6, 2007
    Date of Patent: January 15, 2008
    Assignee: LeTourneau Technologies, Inc.
    Inventors: Ronald A. Johnston, Dwight Baker, Nelson L. Stoldt, Paul K. Schufeldt, Peter J. Bradley
  • Vehicle for materials handling and other industrial uses
    Patent number: 7201244
    Abstract: A heavy duty wheeled vehicle for an industrial environment is electrically driven by one or more switched reluctance motor traction drive system connected to the wheels. The switched reluctance motors are powered by an electrical generator that is driven by an engine, such as a diesel engine, which may run at a substantially constant RPM. A digital control system provides operator displays and controls power conversion from the generator, as well as providing maintenance and control functions for the switched reluctance motors. A heavy-duty hoisting apparatus electrically drives a hoisting mechanism using an SR motor, providing power for lifting a load. The heavy-duty hoisting apparatus may include an engine and generator or provide power to the SR motor from an external source.
    Type: Grant
    Filed: October 3, 2003
    Date of Patent: April 10, 2007
    Assignee: LeTourneau, Inc.
    Inventors: Ronald A. Johnston, Dwight Baker, Nelson L. Stoldt, Paul K. Schufeldt, Peter J. Bradley