Patents by Inventor Walter Kunnmann

Walter Kunnmann 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 the generation of variable density metal vapors which bypasses the liquidus phase
    Patent number: 6179897
    Abstract: The present invention provides a method for producing a metal vapor that includes the steps of combining a metal and graphite in a vessel to form a mixture; heating the mixture to a first temperature in an argon gas atmosphere to form a metal carbide; maintaining the first temperature for a period of time; heating the metal carbide to a second temperature to form a metal vapor; withdrawing the metal vapor and the argon gas from the vessel; and separating the metal vapor from the argon gas. Metal vapors made using this method can be used to produce uniform powders of the metal oxide that have narrow size distribution and high purity.
    Type: Grant
    Filed: March 18, 1999
    Date of Patent: January 30, 2001
    Assignee: Brookhaven Science Associates
    Inventors: Walter Kunnmann, John Z. Larese