Patents by Inventor Mark E. Kravetz

Mark E. Kravetz 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: 5505857
    Abstract: Metals contained in various wastewaters are selectively recovered as metal precipitates and/or as spinel ferrite and water suitable for discharge into the environment is obtained. High grade magnetic spinel ferrite is recovered from wastewaters having aluminum and arsenic if present in the wastewater, removed from the wastewater. There are three process stages for the treatment of wastewater. In the first process stage which is optional, at least a portion of at least one non-ferrous or non-ferric metal is precipitated from the wastewater by subjecting the wastewater to an oxidizing agent to increase the oxidation-reduction potential of the water, by adjusting the pH of the wastewater to a pH at which the metal precipitates from the water and by adding an organic or inorganic sulfur compound, capable of causing the metal to form a precipitate, to the water in a quantity sufficient to precipitate the metal.
    Type: Grant
    Filed: January 13, 1994
    Date of Patent: April 9, 1996
    Assignees: Buckman Laboratories International, Inc., Board of Regents of the University and Community College System of Nevada on behalf of the University of Nevada
    Inventors: Manoranjan Misra, Mark E. Kravetz, Kang Yang, Thomas E. McNeel