Patents by Inventor Fritz Thummler

Fritz Thummler 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).

  • Sponge-iron powder
    Patent number: 5902373
    Abstract: The invention relates to a composition and a method for producing a finely ground powder of sponge-iron and hard-phase material.
    Type: Grant
    Filed: August 29, 1995
    Date of Patent: May 11, 1999
    Assignee: Hoganas AB
    Inventors: Erik Vannman, Lars-.ANG.ke Larsson, Michael Ostgathe, Fritz Thummler
  • Method for powder metallurgical production of structural parts of great strength and hardness from Si-Mn or Si-Mn-C alloyed steels
    Patent number: 4913739
    Abstract: A process for the powder metallurgical production of structural parts of high strength and hardness from silicon-manganese or silicon-manganese-carbon alloyed steels. The alloying elements Si and Mn or Si, Mn and C are mixed, in powder form, by way of the alloy carriers ferrosilicon, ferromanganese or a silicon-manganese-iron master alloy containing silicon and manganese in the ranges from 10 to 30 weight percent Si, 20 to 70 weight percent Mn, remainder Fe, with an iron powder and when carbon is present with graphite, to form a powder mixture. The powder mixture is compressed and sintered at a temperature in a range from 1150.degree. C. to 1250.degree. C. and then cooled.
    Type: Grant
    Filed: March 8, 1985
    Date of Patent: April 3, 1990
    Assignee: Kernforschungszentrum Karlsruhe GmbH
    Inventors: Fritz Thummler, Aloisio N. Klein, Rainer Oberacker