Patents by Inventor Frederick A. Schwizer

Frederick A. Schwizer 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).

  • Minor element additions to single crystals for improved oxidation resistance
    Patent number: 4801513
    Abstract: The additions of minor additions of hafnium and silicon and mixtures thereof to nickel base superalloy single crystal articles provide significantly improved oxidation resistance. The oxidation resistance is improved both for the case of uncoated articles and in the case where a protective coating such as for example, a MCrAlY coated is present. For example the addition of 0.1% hafnium is observed to improve the oxidation resistance by a factor of 4 at 2100.degree. F. and a similar addition improved the coating oxidation resistance by a factor of about 2.5 at 2150.degree. F.
    Type: Grant
    Filed: October 16, 1984
    Date of Patent: January 31, 1989
    Assignee: United Technologies Corporation
    Inventors: David N. Duhl, Frederick A. Schwizer