Patents by Inventor Hans Litterscheidt

Hans Litterscheidt 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: 4808220
    Abstract: The invention relates to a process for the preparation of low-carbon and low-silicon ferromanganese (refined ferromanganese) by blowing with pure oxygen in a converter ferromanganese of high carbon content (high-carbon ferromanganese) produced in a blast furnace. The characterizing feature of the invention is that in an oxidation phase oxygen is blown from above with a top blowing lance on to the melt of high-carbon ferromanganese melt, while at the same time an inert stirring gas is blown through tuyeres into the melt below its level, and on termination of oxygen top blowing, in an immediately following reduction phase, solid reducing agents and lumps of lime are added to the melt to recover the slagged manganese.
    Type: Grant
    Filed: March 1, 1988
    Date of Patent: February 28, 1989
    Assignee: Thyssen Stahl AG
    Inventors: Hans Litterscheidt, Manfred Rahder, Carl-Heinz Schutz, Richard A. Weber