Patents by Inventor Donald L. Keller

Donald L. Keller 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).

  • Superalloy article cleaning and repair method
    Patent number: 4098450
    Abstract: A narrow crevice in a Ni-base superalloy article is repaired by first removal of a complex oxide of at least one metal selected from Al and Ti, by treatment of the oxide in the crevice with gaseous active fluoride ions in a non-oxidizing atmosphere at a temperature at which the oxide will react with the fluoride ions under the conditions around the oxide. The crevice is then repaired in a subsequent step such as by filling with metal or pressure bonding.
    Type: Grant
    Filed: March 17, 1977
    Date of Patent: July 4, 1978
    Assignee: General Electric Company
    Inventors: Donald L. Keller, David L. Resor