Patents by Inventor R. Eugene Curtis

R. Eugene Curtis 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).

  • Aluminum-lithium alloy
    Patent number: 5133930
    Abstract: An aluminum-lithium alloy exhibiting good fracture toughness and relatively high strength has a nominal composition of 2.2 percent lithium, 0.6 percent magnesium, 2.5 percent copper, 0.12 percent zirconium with the balance being aluminum and trace elements.
    Type: Grant
    Filed: March 9, 1990
    Date of Patent: July 28, 1992
    Assignee: The Boeing Company
    Inventors: G. Hari Narayanan, R. Eugene Curtis, William E. Quist, Michael V. Hyatt, Sven E. Axter
  • Aluminum-lithium alloy
    Patent number: 5116572
    Abstract: An aluminum-lithium alloy exhibiting good fracture toughness and relatively high strength has a nominal composition of 2.2 percent lithium, 0.6 percent magnesium, 2.5 percent copper, 0.12 percent zirconium with the balance being aluminum and trace elements.
    Type: Grant
    Filed: August 28, 1989
    Date of Patent: May 26, 1992
    Assignee: The Boeing Company
    Inventors: G. Hari Narayanan, R. Eugene Curtis, William E. Quist, Michael V. Hyatt, Sven E. Axter
  • Low temperature underaging of lithium bearing alloys and method thereof
    Patent number: 4999061
    Abstract: The combination of strength and fracture toughness properties of aluminum-lithium alloys are significantly enhanced by underaging the alloys at temperatures ranging from 200.degree. F. to below 305.degree. F. for relatively long periods of time.
    Type: Grant
    Filed: April 14, 1989
    Date of Patent: March 12, 1991
    Assignee: The Boeing Company
    Inventors: R. Eugene Curtis, G. Hari Narayanan, William E. Quist
  • Low temperature underaging process for lithium bearing alloys
    Patent number: 4840682
    Abstract: The combination of strength and fracture toughness properties of aluminum-lithium alloys are significantly enhanced by underaging the alloys at temperatures ranging from 200.degree. F. to below 300.degree. F. for relatively long periods of time.
    Type: Grant
    Filed: November 21, 1985
    Date of Patent: June 20, 1989
    Assignee: The Boeing Company
    Inventors: R. Eugene Curtis, G. Hari Narayanan, William E. Quist
  • Aluminum-lithium alloy (4)
    Patent number: 4735774
    Abstract: An aluminum-lithium alloy exhibiting good fracture toughness and relatively high strength has a nominal composition of 2.5 percent lithium, 1.0 percent magnesium, 1.6 percent copper, 0.12 percent zirconium with the balance being aluminum and trace elements.
    Type: Grant
    Filed: December 30, 1983
    Date of Patent: April 5, 1988
    Assignee: The Boeing Company
    Inventors: G. Hari Narayanan, William E. Quist, R. Eugene Curtis
  • Aluminum-lithium alloy
    Patent number: 4603029
    Abstract: An aluminum-lithium alloy exhibiting good fracture toughness and relatively high strength has a nominal composition of 2.5 percent lithium, 0.6 percent magnesium, 1.8 percent copper, 0.12 percent zirconium with the balance being aluminum and trace elements.
    Type: Grant
    Filed: March 13, 1985
    Date of Patent: July 29, 1986
    Assignee: The Boeing Company
    Inventors: William E. Quist, R. Eugene Curtis, G. Hari Narayanan