Patents by Inventor Hans-Dieter Puetz

Hans-Dieter Puetz 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 covering silicas with wax
    Patent number: 6921781
    Abstract: The present invention provides a process, which includes: coating at least a portion of a surface of at least one silica particle with at least one wax, wherein the coating is carried out in at least one gas at a temperature above the melting point of the wax and below the decomposition temperature of the wax, to obtain at least one wax-coated silica particle. Other embodiments of the present invention provides processes for impregnating the silica particle with wax and uses of the wax-coated or wax-impregnated particles.
    Type: Grant
    Filed: August 23, 2001
    Date of Patent: July 26, 2005
    Assignee: Degussa AG
    Inventors: Juergen Schubert, Klaus-Dieter Hellwig, Michael Pickel, Hans-Dieter Puetz
  • Process for covering silicas with wax
    Publication number: 20020055556
    Abstract: The present invention provides a process, which includes:
    Type: Application
    Filed: August 23, 2001
    Publication date: May 9, 2002
    Inventors: Juergen Schubert, Klaus-Dieter Hellwig, Michael Pickel, Hans-Dieter Puetz