Patents by Inventor Ulf Hallstrom

Ulf Hallstrom 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).

  • Composite steel material and composite steel tool made from this material
    Patent number: 4232096
    Abstract: A composite steel material consisting of two metallically joined steel components having different chemical compositions is disclosed. The first component is a high-speed tool steel or other high alloy tool steel having a carbon activity and a hardness and wear resistance in the same order as that of high speed tool steel. The second component is a steel consisting essentially of 0.40-0.45 weight percent carbon, 0.40-1.00 weight percent silicon, 0.40-1.00 weight percent manganese, 2.5-4.0 weight percent chromium, 0.50-1.50 weight percent molybdenum, 0.20-0.45 weight percent vanadium, balance iron and normal impurities.
    Type: Grant
    Filed: January 23, 1979
    Date of Patent: November 4, 1980
    Assignee: Uddeholms Aktiebolag
    Inventors: Olof K. Franzen, Ulf Hallstrom, Bengt A. Petersson