Patents Represented by Attorney, Agent or Law Firm Godfried K. Akurli
  • Method for extracting anions
    Patent number: 6709641
    Abstract: The invention relates to a method of extracting anions based on metals of groups IV B to VIII of the periodic table from aqueous solutions thereof, wherein compounds of general formula are used as extractants, in which a maximum of two of the R1, R2, R3 and R4 substituents represent hydrogen atoms and the remaining substituents represent identical or different alkyl or aminoakyl groups, which are optionally branched and which contain on average at least 5 C atoms.
    Type: Grant
    Filed: June 18, 2001
    Date of Patent: March 23, 2004
    Assignee: H.C. Starck GmbH & Co. KG
    Inventors: Wilfried Gutknecht, Wolfgang Mathy