Patents by Inventor David C. Meissner

David C. Meissner 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 reducing particulate iron oxide to molten iron with solid reductant
    Patent number: 4179278
    Abstract: A method for reducing particulate iron oxide to molten iron utilizing solid carbonaceous fuel as reductant in a shaft type reducing furnace, in which a furnace burden is formed of a mixture of iron oxide lumps or pellets and particulate solid fuel. Reacted top gas is upgraded and recirculated through the burden in counter-flow relationship thereby heating, reducing and melting the burden. The heat for reduction and melting is generated by passing electric current through the burden.
    Type: Grant
    Filed: April 3, 1978
    Date of Patent: December 18, 1979
    Assignee: Midrex Corporation
    Inventors: Donald Beggs, David C. Meissner
  • Method for the direct reduction of iron using gas from coal
    Patent number: 4173465
    Abstract: A method for direct reduction of iron in a shaft reduction furnace. Spent gas from the furnace is upgraded in reductant by removal of CO.sub.2 and water to form an upgraded gas. A fossil fuel is gasified to produce a hot gas which is tempered with a first stream of upgraded gas. The mixture is desulfurized by reaction with lime to produce hot desulfurized gas. A second stream of upgraded gas is heated and mixed with the hot desulfurized gas to produce hot reducing gas.
    Type: Grant
    Filed: August 15, 1978
    Date of Patent: November 6, 1979
    Assignee: Midrex Corporation
    Inventors: David C. Meissner, Charles W. Sanzenbacher
  • Method of inhibiting rusting of sponge iron
    Patent number: 4069015
    Abstract: A method for inhibiting rusting of sponge iron or any form of directly reduced iron when contacted by air, water, or other oxidant, by treating the sponge iron with a water soluble alkali metal silicate solution. The resulting product, a sodium silicate treated, rust-resistant metallized iron pellet, is also disclosed.
    Type: Grant
    Filed: September 19, 1975
    Date of Patent: January 17, 1978
    Assignee: Midrex Corporation
    Inventors: William A. Ahrendt, David C. Meissner