Patents by Inventor Helmut Lischka

Helmut Lischka 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).

  • Cored wire with a content of passivated pyrophoric metal, and the use thereof
    Patent number: 5264023
    Abstract: The invention concerns a cored wire comprising a metal tube and a filling of magnesium or other pyrophoric metals passivated with from 0.5 to 5% by weight of organic nitrogen compounds. As the passivating agent, compounds from the series of the s-triazine and/or guanidine derivatives, preferably from 2 to 5% by weight of dicyandiamide, applied by means of an adhesion promoter, are preferred. The wires used in accordance with the invention serve to produce cast iron with spheroidal and vermicular graphite, to desulphurize pig iron melts or to produce metal alloys.
    Type: Grant
    Filed: November 20, 1992
    Date of Patent: November 23, 1993
    Assignee: SKW Trostberg Aktiengesellschaft
    Inventors: Detlef Missol, Friedrich Wolfsgruber, Helmut Lischka
  • Passivation of pyrophoric metals
    Patent number: 5089049
    Abstract: The present invention provides a process for the passivation of pyrophoric metals and especially of magnesium by coating with a passivation agent, wherein, as passivation agent, there is used 0.5 to 5% by weight of an s-triazine derivative and/or a guanidine, referred to the weight of the metal.The present invention also provides a passivated pyrophoric metal, wherein the metal particles are coated with 0.5 to 5% by weight of an s-triazine derivative and/or guanidine or a guanidine derivative, referred to the weight of the metal.
    Type: Grant
    Filed: February 21, 1990
    Date of Patent: February 18, 1992
    Assignee: SKW Trostbert Aktiengesellschaft
    Inventor: Helmut Lischka
  • Agent for desulphurizing iron melts, a process for the production thereof and a process for desulphurizing iron melts with the use of said agent
    Patent number: 4943317
    Abstract: The present invention provides an agent for desulphurizing iron containing calcium carbide and a metallic component, wherein the calcium carbide and the metallic component are present in such a form that the bulk densities and grain sizes thereof lie in the same range.The present invention also provides a process for producing this agent, as well as a process for desulphurizing iron using this agent.
    Type: Grant
    Filed: September 14, 1989
    Date of Patent: July 24, 1990
    Assignee: SKW Trostberg Aktiengesellschaft
    Inventors: Helmut Lischka, Werner Gmohling, Gerd Hieber