Patents Examined by David W. Schumaker
  • 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
  • Sulfidation-resistant Co-Cr-Ni alloy with critical contents of silicon and cobalt
    Patent number: 4711763
    Abstract: Disclosed is a sulfidation-resistant alloy. The alloy preferably may contain about 27% each cobalt and chromium, 8% iron, 2.7% silicon and the balance nickel plus normal impurities found in alloys of this class.The alloy is eminently suitable for applications in high temperature, hostile environments generated by many industrial processes, such as refinery, chemical processing and power generations.
    Type: Grant
    Filed: December 16, 1986
    Date of Patent: December 8, 1987
    Assignee: Cabot Corporation
    Inventor: George Y. Lai