Patents by Inventor Helmut S. Erhard

Helmut S. Erhard 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).

  • Process for the recycling of residues for the production of portland cement clinker
    Patent number: 6146133
    Abstract: The present invention concerns a process for the production of cement clinker in rotary kilns with substitution of primary raw materials and fuels by use of residual materials containing minerals and combustible parts with moisture contents of up to about 65% without predrying. The process makes possible a material and/or thermal utilisation of residual materials in the case of saving of the clay and fuel sources and relief of dumping with simultaneous lowering of the emissions, above all NO.sub.x, in the cement rotary kiln.
    Type: Grant
    Filed: January 29, 1999
    Date of Patent: November 14, 2000
    Assignee: Heidelberger Zement AG
    Inventors: Helmut S. Erhard, Volker Schneider, Paul Korf
  • Method for dry desulfurizing flue gases
    Patent number: 5667582
    Abstract: The present invention relates to a method for dry desulfurizing flue gases from rotary cement kilns, for which additives suitable for binding SO.sub.2, such as quick lime and/or dry calcium hydroxide, are supplied to the kiln, the additive being introduced into a flue gas-carrying zone at the kiln head at a injection angle of 2.degree. to 12.degree. to the axis of the kiln and at an injection velocity of 20 to 80 m/sec.
    Type: Grant
    Filed: September 5, 1996
    Date of Patent: September 16, 1997
    Assignee: Heidelberger Zement Aktiengesellschaft
    Inventors: Jochen Ziegler, Helmut S. Erhard