Patents by Inventor Patrick D. Markham

Patrick D. Markham 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).

  • Impact resistant hollow airfoils
    Patent number: 6048174
    Abstract: A hollow airfoil (34) for a gas turbine engine having a leading edge (50), a trailing edge (52), a pressure side (54), and a suction side (56) includes a solid region of enhanced chordal thickness (78), and buttresses (82, 84, 86, 88). The present invention airfoil is preferentially strengthened so as to reduce the risk of airfoil fracture due to impact of airfoil with successive airfoils during an airfoil loss condition.
    Type: Grant
    Filed: September 10, 1997
    Date of Patent: April 11, 2000
    Assignee: United Technologies Corporation
    Inventors: Marc Samit, Douglas A. Welch, Paul W. Duesler, Patrick D. Markham, Allan R. Penda