Patents by Inventor Douglas Lloyd Singbeil

Douglas Lloyd Singbeil 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).

  • Corrosion-resistant exterior alloy for composite tubes
    Patent number: 7231714
    Abstract: An austenitic Ni—Cr—Fe alloy is provided as an exterior tube material for improved cracking and corrosion resistance of composite tubes used to construct the lower furnace section of kraft recovery boilers. The alloy consists of essentially, on a weight-% basis, 25-35 Cr, 5-15 Fe and 50-70 Ni, with other minor alloying elements and impurities such as are normally present in commercial alloys. This compositional range includes, as a preferred composition, the range corresponding to the commercial alloy 690 (UNS N06690).
    Type: Grant
    Filed: May 19, 2005
    Date of Patent: June 19, 2007
    Assignee: FPInnovations
    Inventors: Douglas Lloyd Singbeil, Joseph Ralph Kish