Patents by Inventor Benjamin C. Liu

Benjamin C. Liu 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).

  • Anti-toppling device for mail with retractable protrusion
    Patent number: 7467792
    Abstract: A mail destacker is provided that includes a destacker plate and a retractable protrusion that can move between an article erecting position and a retracted position.
    Type: Grant
    Filed: September 23, 2005
    Date of Patent: December 23, 2008
    Assignee: Northrop Grumman Corporation
    Inventors: Mark David Bittenbender, Benjamin C. Liu, Kevin D. Bruner