Patents by Inventor Patrick Hvolka

Patrick Hvolka 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).

  • 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
  • Two speed gearbox
    Patent number: 7537536
    Abstract: A universal two speed gearbox for driving high speed vehicles under high temperature operating conditions, and other devices which require variable operating two speed bearing thrust.
    Type: Grant
    Filed: August 26, 2006
    Date of Patent: May 26, 2009
    Inventors: Dusan J. Hvolka, Patrick Hvolka
  • Two speed gearbox
    Publication number: 20070287575
    Abstract: A universal two speed gearbox for driving high speed vehicles under high temperature operating conditions, and other devices which require variable operating two speed bearing thrust.
    Type: Application
    Filed: August 26, 2006
    Publication date: December 13, 2007
    Inventors: Dusan J. Hvolka, Patrick Hvolka