Patents by Inventor Donald R. Gradwohl

Donald R. Gradwohl 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: 8011876
    Abstract: A wind driven power generator has a rotational shroud assembly for maximizing wind input and a turbine assembly with a shaft that rotates within the shroud assembly. The shaft end extends through the base of the shroud assembly. The turbine assembly has elongate arms attached to the top portion of the shaft of the turbine assembly. Each arm is essentially perpendicular to the shaft and has a vertical wind blade attached to each of the arm ends and spaced equidistance apart around the shaft of the turbine assembly. The shroud assembly covers approximately half of the turbine assembly during rotation and maintains a windward direction for maximum wind on the blade fronts while shielding the back sides of the blades from the incoming wind.
    Type: Grant
    Filed: October 25, 2006
    Date of Patent: September 6, 2011
    Inventors: Donald R. Gradwohl, Jonald R. Gradwohl
  • Publication number: 20080101932
    Abstract: The present invention is a wind driven power generator that has a rotational shroud assembly that has a base portion that is attached to a plurality of rotational base guides. A structure base has an annular shaped receiving rotational track that the rotational base guides rotate within. There is a turbine assembly that rotates within the shroud assembly which has a top portion and a shaft end. The shaft end extends through the base of the rotational shroud assembly and through the structure base. The top portion of the turbine assembly has at least one elongate arm that has a first arm end and a second arm end. The arm is attached to the shaft near the top portion of the turbine assembly and equidistance from the first arm end and the second arm end. Each arm is essentially perpendicular to the shaft of the turbine assembly. There is at least one vertical wind blade attached to each of the first arm ends and the second arm ends.
    Type: Application
    Filed: October 25, 2006
    Publication date: May 1, 2008
    Inventors: Donald R. Gradwohl, Jonald R. Gradwohl
  • Patent number: 4227709
    Abstract: A hand truck which is convertible to a steerable wagon by means of a steering assembly fastenable to the hand truck handles. A body member and bottom member fastenable to the frame of the hand truck form the side walls and bottom, respectively, of the wagon.
    Type: Grant
    Filed: December 4, 1978
    Date of Patent: October 14, 1980
    Inventors: Donald R. Gradwohl, Jonald R. Gradwohl