Patents by Inventor Donald C. Duncan

Donald C. Duncan 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).

  • Turbulator with integral flow deflector tabs
    Patent number: 4727907
    Abstract: A turbulator for insertion in a heat exchange pipe in the form of a flattened hollow cylindrical metal tube with adjacent flats offset by 90.degree. and separated by integral tubular transition portions of generally triangular plane configuration. An elongated tab is partially struck out of each flat forming a fluid passage hole leading from one side of the turbulator to the other side.
    Type: Grant
    Filed: March 30, 1987
    Date of Patent: March 1, 1988
    Assignee: Dunham-Bush
    Inventor: Donald C. Duncan