Patents by Inventor Robert W. Krieble

Robert W. Krieble 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).

  • Case-hardening alloy steel and case-hardened article made therefrom
    Patent number: 4157258
    Abstract: A carburizing alloy steel and case-hardened articles made therefrom, having high core impact strength and fracture toughness combined with high case hot hardness and temper resistance at 400.degree. F. (204.degree. C.), containing 0.06-0.16% carbon, 0.2-0.7% manganese, 0.5-1.5% silicon, 0.5-1.5% chromium, 1.5-3% nickel, 1-4% copper, 2.5-4% molybdenum, up to 0.4% vanadium, and the balance iron and incidental impurities. The alloy may also contain small amounts of phosphorus, sulfur, nitrogen, aluminum, columbium, titanium, zirconium, and calcium.
    Type: Grant
    Filed: August 18, 1978
    Date of Patent: June 5, 1979
    Assignee: Carpenter Technology Corporation
    Inventors: Thoni V. Philip, Robert W. Krieble