Patents by Inventor Viliam Raffaj

Viliam Raffaj 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).

  • Direct drive electric shift two speed planetary gearbox
    Publication number: 20100267508
    Abstract: A direct drive electric shift two speed planetary gearbox using a linear actuator to engage selectively the ring gear either to the housing or to the carrier by means of a synchronizing clutch to provide a low speed mode, a neutral mode, and a high speed mode of operation resulting in significant fuel efficiencies.
    Type: Application
    Filed: April 16, 2009
    Publication date: October 21, 2010
    Applicant: DJH Engineering Center, Inc.
    Inventors: Dusan J. Hvolka, Patriek Hvolka, Viliam Raffaj
  • Two speed planetary electric shift gearbox
    Publication number: 20090247346
    Abstract: A direct drive electric shift two speed planetary gearbox using a linear actuator to engage selectively planet, sun and ring gears to provide a low speed mode, a neutral mode, and a high speed mode of operation with significant fuel efficiencies.
    Type: Application
    Filed: March 25, 2008
    Publication date: October 1, 2009
    Inventors: Dusan J. Hvolka, Patrick Hvolka, Viliam Raffaj