Patents by Inventor Henry E. Hilliard

Henry E. Hilliard 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).

  • Recycling superalloy scrap by vapor phase zinc embrittlement
    Patent number: 4718939
    Abstract: A method of making superalloy scrap friable in order to allow greater recovery of metal values therein is disclosed whereby the scrap is treated with zinc vapor. After exposure to the zinc vapor, the metal scrap becomes friable so that it can be easily crushed. Thereafter, the metal values, particular of cobalt and nickel, can be easily recovered. The process can be made continuous by recovering and reusing the excess zinc vapor used in the treatment.
    Type: Grant
    Filed: December 24, 1986
    Date of Patent: January 12, 1988
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventor: Henry E. Hilliard