Patents by Inventor Alexis C. Lewis

Alexis C. Lewis 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).

  • Desensitization of Aluminum Alloys Using Pulsed Electron Beams
    Publication number: 20160108504
    Abstract: A method for desensitizing an aluminum alloy is presented. A desired location on the surface of an aluminum alloy sample is exposed to a controlled pulsed electron beam. The pulsed electron beam heats a shallow layer of the metal alloy having a desired depth at the desired location on the surface of the sample to a temperature between a solvus temperature and an annealing temperature of the metal alloy to controllably reduce a degree of sensitization of the metal alloy sample at the desired location, an extent of a reduction in the degree of sensitization being controllable by varying at least one of a voltage, a current density, a pulse duration, a pulse frequency and a number of pulses of the electron beam.
    Type: Application
    Filed: February 5, 2015
    Publication date: April 21, 2016
    Inventors: John D. Sethian, Matthew C. Myers, Mathew Wolford, Frank Hegeler, Ronald L. Holtz, Derek Horton, Alexis C. Lewis, Kathryn J. Wahl
  • Desensitization of aluminum alloys using pulsed electron beams
    Patent number: 9315886
    Abstract: A method for desensitizing an aluminum alloy is presented. A desired location on the surface of an aluminum alloy sample is exposed to a controlled pulsed electron beam. The pulsed electron beam heats a shallow layer of the metal alloy having a desired depth at the desired location on the surface of the sample to a temperature between a solvus temperature and an annealing temperature of the metal alloy to controllably reduce a degree of sensitization of the metal alloy sample at the desired location, an extent of a reduction in the degree of sensitization being controllable by varying at least one of a voltage, a current density, a pulse duration, a pulse frequency and a number of pulses of the electron beam.
    Type: Grant
    Filed: February 5, 2015
    Date of Patent: April 19, 2016
    Assignee: The United States of America, as represented by the Secretary of the Navy
    Inventors: John D. Sethian, Matthew C. Myers, Mathew Wolford, Frank Hegeler, Ronald L. Holtz, Derek Horton, Alexis C. Lewis, Kathryn J. Wahl