Patents by Inventor Helmut Holste

Helmut Holste 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 preparing methylhydroxyalkylcellulose having a small number of coloured particles
    Patent number: 8197699
    Abstract: The present invention describes a process for preparing methylhydroxyalkylcellulose having a small number of colored particles by separation of methylhydroxyalkylcellulose from aqueous suspension with subsequent washing of the methylhydroxyalkylcellulose using a specially equipped rotary pressure filter.
    Type: Grant
    Filed: September 15, 2006
    Date of Patent: June 12, 2012
    Assignee: Dow Global Technologies LLC
    Inventors: Martin Kowollik, Wolfgang Dannhorn, Erik-Andreas Klohr, Hartwig Schlesiger, Bernhard Kranz, Helmut Holste, Gerd Sonnenberg
  • Process for preparing methylhydroxyalkylcellulose having a small number of coloured particles
    Publication number: 20070210014
    Abstract: The present invention describes a process for preparing methylhydroxyalkylcellulose having a small number of coloured particles by separation of methylhydroxyalkylcellulose from aqueous suspension with subsequent washing of the methylhydroxyalkylcellulose using a specially equipped rotary pressure filter.
    Type: Application
    Filed: September 15, 2006
    Publication date: September 13, 2007
    Applicant: Wolff Cellulosics GmbH & Co. KG
    Inventors: Martin Kowollik, Wolfgang Dannhorn, Erik-Andreas Klohr, Hartwig Schlesiger, Bernhard Kranz, Helmut Holste, Gerd Sonnenberg