Patents by Inventor David W. Graf

David W. Graf 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).

  • Locking device for hydraulic attachment interface
    Patent number: 7690880
    Abstract: An interface between a hydraulic power system and an hydraulically actuated engagement member includes a first portion that is pivotally coupled to a second portion, and has an inlet capable of being coupled to the power system. The second portion is fixedly attached to an attachment bracket capable of interfacing with an attachment. The first portion has a path to provide oil to the second portion, which in turn provides oil from the first portion to the attachment bracket. The attachment bracket includes a housing that accepts an engagement member capable of being hydraulically actuated to secure or release the attachment with respect to the power machine.
    Type: Grant
    Filed: April 25, 2006
    Date of Patent: April 6, 2010
    Assignee: Clark Equipment Company
    Inventors: Russell A. Honeyman, David E. Marotte, Gerald J. Duppong, David W. Graf, Wally L. Kaczmarski
  • Mini-excavator canopy
    Patent number: D481398
    Type: Grant
    Filed: September 26, 2002
    Date of Patent: October 28, 2003
    Assignee: Clark Equipment Company
    Inventors: Thomas J. Tokach, Michael D. Wetzel, David W. Graf, Henry J. Weber
  • Mini-excavator canopy
    Patent number: D487100
    Type: Grant
    Filed: September 26, 2002
    Date of Patent: February 24, 2004
    Assignee: Clark Equipment Company
    Inventors: Thomas J. Tokach, Michael D. Wetzel, David W. Graf, Henry J. Weber