Patents by Inventor Richard Karkkainen

Richard Karkkainen 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 hydrometallurgical treatment of electric arc furnace dust
    Publication number: 20070041883
    Abstract: A process for treating electric arc furnace dust to recover lead, zinc, iron and precious metals by washing the dust, solubilizing and electrowinning some metals, and extracting other metals from the solids left after the solubilizing step.
    Type: Application
    Filed: February 6, 2006
    Publication date: February 22, 2007
    Inventors: Brendan McDevitt, Richard Karkkainen, Eduardo Sacris, David Nahmad, Elizabeth Sendil