Patents by Inventor Hans Grewe

Hans Grewe 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).

  • Patent number: 5149381
    Abstract: A process for the production of a powder having a nanocrystalline structure from powders of at least two materials of the groups including metals, metallic compounds, and ceramic materials, in a composition which tends to develop an amorphous phase. The starting powders are subjected to high stresses of at least 12 G in a neutral or reducing atmosphere at about C. until there are no crystallites larger than about 10 nm.
    Type: Grant
    Filed: December 5, 1988
    Date of Patent: September 22, 1992
    Assignee: Fried.Krupp GmbH
    Inventors: Hans Grewe, Wolfgang Schlump
  • Patent number: 5147449
    Abstract: A process for producing metal metalmetalloid powder, with its particles having ultramicrocrystalline structures to nanocrystalline structures with the metalmetalloid component being composed of at least one metal reacted with at least one metalloid of the group including C, N, O, H, B, and Si. The metalloids, C, N, O, H, B, and Si are introduced in a highly reactive form together with powders of the metals of the matrix metal and of the metals of the metalmetalloid component into a high energy mill to produce a metal-metalmetalloid powder with its particles having a ultramicrocrystalline to nanocrystalline structure both in the metal matrix and in the metal metalloid component.
    Type: Grant
    Filed: April 11, 1989
    Date of Patent: September 15, 1992
    Assignee: Fried. Krupp Gesellschaft mit beschrankter Haftung
    Inventors: Hans Grewe, Wolfgang Schlump
  • Patent number: 4284687
    Abstract: A compound body comprising a metallic basic body, an inner layer or layers of carbides and/or nitrides of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Si, or B, and an outer layer or layers of a mixture of oxides and nitrides and/or oxynitrides of Cr, Al, Ca, Mg, Th, Sc, Y, La, Ti, Hf, V, Nb, or Ta. The compound body can be used as a part subject to wear, and for machining metallic materials.
    Type: Grant
    Filed: November 16, 1979
    Date of Patent: August 18, 1981
    Assignee: Fried Krupp Gesellschaft mit beschrankter Haftung
    Inventors: Klaus Dreyer, Hans Grewe, Johannes Kolaska, Norbert Reiter
  • Patent number: 4276096
    Abstract: Method for producing a hard metal body having increased wear resistance, the body containing at least one of the binder metals iron, cobalt and nickel and at least one carbide of the elements titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum and tungsten, the body being produced by way of sintering and having a nitrogen containing surface, comprises subjecting a hard metal body containing the binder metal and carbide to a pressure between 2 bar and 5000 bar in a sintering autoclave at a high temperature and in a nitrogen containing atmosphere, after final sintering, to enrich the hard metal body with nitrogen and to form the nitrogen containing surface.
    Type: Grant
    Filed: January 22, 1980
    Date of Patent: June 30, 1981
    Assignee: Fried. Krupp Gesellschaft mit beschrankter Haftung
    Inventors: Johannes Kolaska, Hans Grewe