Patents by Inventor Robert W. Sheffield, Jr.

Robert W. Sheffield, Jr. 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).

  • Gate for mixer unit of a concrete transport vehicle
    Patent number: 6880965
    Abstract: A mixing drum gate for a concrete transport vehicle is described. The gate includes a pivotally mounted plate that abuts the lower portion of the rim of the drum mouth and is biased against it so as to maintain the abutment during rotation, shifting and flexing of the drum. The gate may include a pneumatically controlled opening mechanism that pivots the plate between an open, closed and intermediate positions.
    Type: Grant
    Filed: January 14, 2003
    Date of Patent: April 19, 2005
    Inventor: Robert W. Sheffield, Jr.