Patents Examined by S J Bos
  • Recovery process for wastes containing hexavalent chromium
    Patent number: 6833124
    Abstract: A process for recovery of hexavalent chromium from waste streams. The method includes providing a waste stream containing hexavalent chromium, reacting a soluble non-toxic precipitating reagent with the hexavalent chromium to form an insoluble precipitating reagent-chromate precipitate, and recovering the insoluble precipitating reagent-chromate precipitate. It may optionally include reacting the insoluble precipitating reagent-chromate precipitate with an acidic solution to form an insoluble precipitating reagent precipitate and a soluble hexavalent chromium compound, and recovering the soluble hexavalent chromium compound. The process may also include reacting the insoluble precipitating reagent precipitate with a solubilizing reagent to form the soluble non-toxic precipitating reagent.
    Type: Grant
    Filed: January 31, 2002
    Date of Patent: December 21, 2004
    Assignee: University of Dayton
    Inventors: Andrew Wells Phelps, Jeffrey Allen Sturgill, Joseph Thomas Swartzbaugh
  • Boehmitic aluminas, and high-temperature stabile and highly porous aluminum oxides in a pure phase which are obtained therefrom
    Patent number: 6773690
    Abstract: This invention relates to crystalline boehmitic aluminas the crystallites of which exhibit unusual dimensional differences in the space directions 020 and 120. This invention further relates to a method for preparing such aluminas and the follow-up products obtained therefrom by calcination.
    Type: Grant
    Filed: June 9, 2000
    Date of Patent: August 10, 2004
    Assignee: SASOL Germany Gmb
    Inventors: Klaus Noweck, Jürgen Schimanski, Jens Juhl, Frank Michael Bohnen, Reiner Glöckler, Arnold Meyer