Patents by Inventor Donald E. Troll

Donald E. Troll 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).

  • Patent number: 6889784
    Abstract: A vehicle incorporating a power unit having a front portion, a rear portion and a power source. A drive wheel, disposed in the front of the power unit, is connected to the power source. A brake pad is connected to the power unit beneath the power source and a handle bar extends back from the power unit. The vehicle includes a trailer unit, disposed behind the power unit, having two trailer wheels, disposed on opposite sides of the trailer unit. A connecting joint, connecting the power unit to the trailer unit, allows the power unit and trailer unit to move with respect to one another about the horizontal pitch axis and/or vertical yaw axis.
    Type: Grant
    Filed: January 24, 2003
    Date of Patent: May 10, 2005
    Inventor: Donald E. Troll