Patents Assigned to Cleveland Cliffs Iron Company
  • Process for making pig iron
    Patent number: 5810905
    Abstract: A process for producing pig iron from iron ore fines wherein the fines are partially reduced in a fluid bed reactor and, without pelletizing, briquetting or otherwise agglomerating the partially reduced fines, injecting them with a lance below the surface of a bath of a submerged arc furnace.
    Type: Grant
    Filed: October 7, 1996
    Date of Patent: September 22, 1998
    Assignee: Cleveland Cliffs Iron Company
    Inventor: Richard L. Shultz
  • Inerting of pulverizing mills for combustible materials
    Patent number: 4244529
    Abstract: A method is provided for inhibiting the occurrence of explosions or puffs in a coal pulverizing mill by introducing a sufficient amount of water vapor into the primary air stream of a coal pulverizing system immediately prior to the introduction of coal at start-up and during stripping at shutdown.
    Type: Grant
    Filed: May 7, 1979
    Date of Patent: January 13, 1981
    Assignee: The Cleveland Cliffs Iron Company
    Inventors: Robert M. DeGabriele, Humberto Causilla, Jr.