Patents by Inventor Duane R. De Boef

Duane R. 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).

  • Grinding drum with a cutter arrangement for a direction of rotation
    Patent number: 7959097
    Abstract: Grinding members on a grinding drum are arranged to move the material to be reduced laterally across the drum. The drum may be used in a tub grinder where the tub is configured to rotate about a vertical axis. In a tub grinder environment, the drum extends through the grinding floor, is configured to rotate about a horizontal axis, and includes cutters arranged in a right-handed helical pattern on the drum.
    Type: Grant
    Filed: January 4, 2008
    Date of Patent: June 14, 2011
    Assignee: Vermeer Manufacturing Company
    Inventor: Duane R. De Boef
  • GRINDING DRUM WITH A CUTTER ARRANGEMENT FOR A DIRECTION OF ROTATION
    Publication number: 20080277509
    Abstract: Grinding members on a grinding drum are arranged to move the material to be reduced laterally across the drum. The drum may be used in a tub grinder where the tub is configured to rotate about a vertical axis. In a tub grinder environment, the drum extends through the grinding floor, is configured to rotate about a horizontal axis, and includes cutters arranged in a right-handed helical pattern on the drum.
    Type: Application
    Filed: January 4, 2008
    Publication date: November 13, 2008
    Applicant: Vermeer Manufacturing Company
    Inventor: Duane R. De Boef
  • Rotary grinder apparatus and method
    Patent number: 7213779
    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: Grant
    Filed: September 28, 2004
    Date of Patent: May 8, 2007
    Assignee: Vermeer Manufacturing Company
    Inventors: Keith Roozeboom, Gary Verhoef, Duane R. De Boef
  • Rotary grinder apparatus and method
    Patent number: 6840471
    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: Grant
    Filed: May 3, 2002
    Date of Patent: January 11, 2005
    Assignee: Vermeer Manufacturing Company
    Inventors: Keith Roozeboom, Gary Verhoef, Duane R. De Boef
  • Rotary grinder apparatus and method
    Publication number: 20020190148
    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: May 3, 2002
    Publication date: December 19, 2002
    Inventors: Keith Roozeboom, Gary Verhoef, Duane R. De Boef
  • Rotary grinder apparatus and method
    Patent number: 6422495
    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: Grant
    Filed: February 25, 2000
    Date of Patent: July 23, 2002
    Assignee: Vermeer Manufacturing Company
    Inventors: Duane R. De Boef, Keith Roozeboom, Gary Verhoef
  • Swinging hammer for a material reducing machine
    Patent number: 5507441
    Abstract: A hammer for mounting to and rotary movement by a rotor of a material reducing machine. The hammer is mounted at a first end portion thereof for free pivotal movement about an axis parallel to the axis of rotation of the rotor. A material engaging tooth extends radially outwardly from the second end portion thereof. In a preferred embodiment, the tooth is a rotary conical bit.
    Type: Grant
    Filed: January 4, 1994
    Date of Patent: April 16, 1996
    Assignee: Vermeer Manufacturing Company
    Inventors: Duane R. De Boef, Jeff A. Fleenor, Thomas J. Kurt