Patents by Inventor David J. Chellman

David J. Chellman 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).

  • Low density aluminum lithium alloy
    Patent number: 5234662
    Abstract: Aluminum based alloy primarily for use in aircraft and aerospace components consists essentially of the composition: 2.60 to 3.30 weight percent copper, 0.0 to 0.50 weight percent manganese, 1.30 to 1.65 weight percent lithium, 0.0 to 1.8 percent magnesium, and from 0.0 to 1.5 weight percent of grain refinement elements selected from the group consisting of zirconium, and chromium. Up to about 0.5 wt. % zinc and up to about 1.5 wt. % titanium may also be present. Minor impurities may also be present. These alloys exhibit an improved combination of characteristics including low density, high strength, high corrosion resistance and good fracture toughness.
    Type: Grant
    Filed: February 15, 1991
    Date of Patent: August 10, 1993
    Assignee: Reynolds Metals Company
    Inventors: Edward S. Balmuth, David J. Chellman, Frank W. Gayle, Richard A. Rainen, Michael H. Skillingberg