Patents by Inventor Diederik Rudolf Schowanek

Diederik Rudolf Schowanek 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 separation of heavy metals from residues by use of ethylene-diamine-disuccinic acid (edds) complexant
    Patent number: 6485629
    Abstract: A process for separating a first source of a heavy metal ion or mixtures of heavy metal ions, (Me1), from a solution comprising a complex of said Me1 and EDDS, (Me1-EDDS), by displacement of said Me1 with a second source of a heavy metal ion Me2 by addition to the solution of a salt of said Me2.
    Type: Grant
    Filed: February 28, 2001
    Date of Patent: November 26, 2002
    Assignee: The Procter & Gamble Company
    Inventors: Diederik Rudolf Schowanek, Tom Cornelis Jan Feijtel
  • Separation of heavy metals and materials for use in this
    Patent number: 6264720
    Abstract: The present invention concerns a composition and method for separating heavy metals from contaminated substrates with compositions containing active agent selected from the group consisting of [S,S]-ethylene diamine disuccinic acid and [S,S]-di-imine butane dioic acid.
    Type: Grant
    Filed: July 21, 1999
    Date of Patent: July 24, 2001
    Assignee: The Procter & Gamble Co.
    Inventors: Diederik Rudolf Schowanek, Tom Cornelis Jan Feijtel