Patents by Inventor Duane De Boef

Duane De Boef 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).

  • Rotary grinder apparatus and method
    Publication number: 20050035234
    Abstract: A rotary grinder having a cylindrical drum that includes a cylindrical surface. The cylindrical surface defines two holes. The drum receives opposite ends of a through-member at the two holes such that the opposite ends of the through-member comprise hammers when the cylindrical drum is rotated. A single retaining member is used to secure all of the through-members to the drum.
    Type: Application
    Filed: September 28, 2004
    Publication date: February 17, 2005
    Applicant: Vermeer Manufacturing Company
    Inventors: Keith Roozeboom, Gary Verhoef, Duane De Boef