Patents by Inventor Gerhard Kelbch

Gerhard Kelbch 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 of removing chlorinated phenol impurities
    Patent number: 4280012
    Abstract: A method of removing an impurity of the group chlorinated dibenzo-p-dioxins, chlorinated dibenzofurans, chlorinated hydroxydiphenylethers and chlorinated diphenylethers from a substance containing the same which comprises contacting said substance with an agent which is hydrazine, acetylene, an acetylene derivative or a compound which under the processing conditions is a source of hydrazine or acetylene.
    Type: Grant
    Filed: March 1, 1979
    Date of Patent: July 21, 1981
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Albino Pastura, Gerhard Kelbch, Hans-Leo Hulsmann