Patents by Inventor Jörg Bredthauer

Jörg Bredthauer 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).

  • Method for producing tungsten carbides by gas-phase carburization
    Patent number: 7118635
    Abstract: The invention relates to a method for producing wolfram carbides by gas-phase carburetion of wolfram powders and/or suitable wolfram precursor compounds in powder form at temperatures above 850° C. According to the method a CO2/CO mixture with a CO2 content greater than the Boudouard equilibrium content corresponding to the carburetion temperature is used as carburetion gas phase.
    Type: Grant
    Filed: November 3, 1999
    Date of Patent: October 10, 2006
    Assignee: H. C. Starck GmbH & Co. KG
    Inventors: Gerhard Gille, Benno Gries, Jörg Bredthauer
  • Ultra-coarse, monocrystalline tungsten carbide and a process for the preparation thereof, and hardmetal produced therefrom
    Patent number: 6749663
    Abstract: A process is described for the preparation of tungsten and/or molybdenum metal powder or carbide by reducing and optionally carburizing treatment of tungsten and/or molybdenum oxide powder in the presence of alkali metal compounds, wherein at least two alkali metal compounds are used in a ratio so that mixed alkali tungstate or molybdate potentially formed in an intermediate step ((Li, Na, K)2 WOZ, (Li, Na, K)2MoOZ) has a melting point of less than 550° C., wherein z is from 3 to 4.
    Type: Grant
    Filed: August 30, 2001
    Date of Patent: June 15, 2004
    Assignee: H.C. Starck GmbH
    Inventors: Jörg Bredthauer, Benno Gries, Bernhard Szesny
  • Method for producing hard metal mixtures
    Patent number: 6626975
    Abstract: The invention relates to a method for producing a homogeneous mixture of hard material powders and binder metal powders without using grinding bodies, liquid grinding auxiliary agents and suspending media. According to the invention, the mixture components are mixed at close range while generating a high shearing collision velocity of the powder particles and are remotely mixed by rotating the mixing bed without resulting in a particle size reduction of the hard material powders.
    Type: Grant
    Filed: July 13, 2001
    Date of Patent: September 30, 2003
    Assignee: H. C. Starck GmbH & Co. KG
    Inventors: Benno Gries, Jörg Bredthauer