Patents by Inventor Christoph Stiepani

Christoph Stiepani 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).

  • Method for decontaminating surfaces of nuclear plants which have been contaminated with alpha emitters
    Patent number: 8702868
    Abstract: A method for decontaminating nuclear plant surfaces, which have been contaminated with alpha emitters, is carried out subsequently to a decontamination process which is aimed at the removal of oxide layers. The surfaces are treated with an aqueous solution which contains a cationic or zwitterionic surfactant and oxalic acid. At least a part of the solution, after having acted on a surface, is conducted across an ion exchanger.
    Type: Grant
    Filed: May 27, 2009
    Date of Patent: April 22, 2014
    Assignee: Areva GmbH
    Inventors: Rainer Gassen, Christoph Stiepani, Horst-Otto Bertholdt, Bertram Zeiler
  • METHOD FOR DECONTAMINATING SURFACES OF NUCLEAR PLANTS WHICH HAVE BEEN CONTAMINATED WITH ALPHA EMITTERS
    Publication number: 20100116288
    Abstract: A method for decontaminating nuclear plant surfaces, which have been contaminated with alpha emitters, is carried out subsequently to a decontamination process which is aimed at the removal of oxide layers. The surfaces are treated with an aqueous solution which contains a cationic or zwitterionic surfactant and oxalic acid. At least a part of the solution, after having acted on a surface, is conducted across an ion exchanger.
    Type: Application
    Filed: May 27, 2009
    Publication date: May 13, 2010
    Applicant: AREVA NP GMBH
    Inventors: Horst-Otto Bertholdt, Rainer Gassen, Christoph Stiepani, Bertram Zeiler