Patents by Inventor Robert A. Donald, III

Robert A. Donald, III 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).

  • Flow responsive safety valve
    Patent number: 4301833
    Abstract: An automatic safety flow valve for fluid gas or liquid conveying conduits has a fluo-dynamically surface substantially flat plate eccentrically pivoted to turn in response to fluid flow rates above a normal threshold from a position substantially parallel to the flow path to a position retarding or stopping the flow.
    Type: Grant
    Filed: October 5, 1979
    Date of Patent: November 24, 1981
    Inventor: Robert A. Donald, III