Patents by Inventor Carl E. Lowell

Carl E. Lowell 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).

  • Nial-base composite containing high volume fraction of AlN for advanced engines
    Patent number: 5635654
    Abstract: A particulate reinforced NiAl-AlN composite alloy has a NiAl matrix and greater than about 13 volume percent fine particles of AlN within the matrix. The particles preferably have a diameter from about 15 nanometers to about 50 nanometers. The particulate reinforced NiAl-AlN composite alloy may be prepared by cryomilling prealloyed NiAl in liquid nitrogen using grinding media having a diameter of from about 2 mm to about 6 mm at an impeller speed of from about 450 RPM to about 800 RPM. The cryomilling may be done for a duration of from about 4 hours to about 20 hours to obtain a cryomilled powder. The cryomilled powder may be consolidated to form the particulate reinforced NiAl-AlN composite alloy. The particulate reinforced alloy can further include a toughening alloy. The toughening alloy may include NiCrAlY, FeCrAY and FeAl.
    Type: Grant
    Filed: May 5, 1994
    Date of Patent: June 3, 1997
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Mohan G. Hebsur, John D. Whittenberger, Carl E. Lowell
  • Light weight polymer matrix composite material
    Patent number: 4992528
    Abstract: A graphite fiber reinforced polymer matrix is layed up, cured, and thermally aged at about 750.degree. F. in the presence of an inert gas. The heat treatment improves the structural integrity and alters the electrical conductivity of the materials. In the preferred embodiment PMR-15 polyimides and Celion-6000 graphite fibers are used.
    Type: Grant
    Filed: December 5, 1988
    Date of Patent: February 12, 1991
    Assignee: The United States of America, as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Kenneth J. Bowles, Carl E. Lowell
  • Nickel base coating alloy
    Patent number: 4610736
    Abstract: Zirconium is added to a Ni-30 Al (Beta) intermetallic alloy in the range of 0.05 w/o to 0.25 w/o. This addition is made during melting or by using metal powders. The addition of zirconium improves the cyclic oxidation resistance of the alloy at temperatures above 1100.degree. C.
    Type: Grant
    Filed: March 23, 1983
    Date of Patent: September 9, 1986
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Charles A. Barrett, Carl E. Lowell
  • NiCrAl ternary alloy having improved cyclic oxidation resistance
    Patent number: 4340425
    Abstract: NiCrAl alloys are improved by the addition of zirconium. These alloys are in the .beta. or .gamma./.gamma.'+.beta. region of the ternary system.Zirconium is added in a very low amount between 0.06 and 0.20 weight percent. There is a narrow optimum zirconium level at the low value of 0.13 weight percent.Maximum resistance to cyclic oxidation is achieved when the zirconium addition is at the optimum value.
    Type: Grant
    Filed: October 23, 1980
    Date of Patent: July 20, 1982
    Inventors: Robert A. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Frosch, Charles A. Barrett, Carl E. Lowell, Abdus S. Khan