Patents by Inventor Ernst Feder

Ernst Feder 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).

  • Chemically removing iron from grits
    Patent number: 4118459
    Abstract: Iron is removed from grits, e.g. crushed corundum by contacting the grits with aqueous hydrochloric acid for dissolving of the iron and provision of a suspension of the grits in the acedic aqueous medium; water is added to the suspension and it is then centrifuged; water is added to the grit-rich fraction and the resulting suspension is subjected to a second centrifuging step.
    Type: Grant
    Filed: February 7, 1977
    Date of Patent: October 3, 1978
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Wilhelm Falkenhain, Ernst Feder