Patents by Inventor Frank Russold

Frank Russold 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).

  • PUMP SYSTEM INCLUDING A VARIABLE FREQUENCY DRIVE CONTROLLER
    Publication number: 20090087319
    Abstract: A pump system generally comprising an electrical connector operable to couple with an electric circuit to receive electricity, an electric motor operable to actuate a pump to pump a fluid, and a variable frequency drive (VFD) controller. The VFD controller is operable to control the rotational speed of the electric motor by providing a variable frequency signal to the electric motor to prevent the current utilized by the electric motor from exceeding a maximum current level associated with the electric circuit.
    Type: Application
    Filed: September 27, 2007
    Publication date: April 2, 2009
    Applicant: LIQUIDYNAMICS, INC.
    Inventors: Frank Russold, Mark A. McClatchy