Patents by Inventor Hans-Dieter Gerriets

Hans-Dieter Gerriets 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 improving the color number of trimethylolpropane
    Patent number: 8686197
    Abstract: The present invention relates to a method for producing trimethylolpropane having a low color number by processing a raw reaction solution obtained according to the inorganic Cannizarro process while adhering to precisely defined pH values.
    Type: Grant
    Filed: August 6, 2010
    Date of Patent: April 1, 2014
    Assignee: LANXESS Deutschland GmbH
    Inventors: Ulrich Notheis, Hans-Dieter Gerriets, Michael Friederich
  • Method for isolating di-trimethylol propane
    Patent number: 8642816
    Abstract: The present invention relates to a method for isolating ditrimethylol propane from secondary trimethylol propane production streams.
    Type: Grant
    Filed: August 11, 2009
    Date of Patent: February 4, 2014
    Assignee: LANXESS Deutschland GmbH
    Inventors: Gunter Rauchschwalbe, Ulrich Notheis, Michael Friederich, Hans-Dieter Gerriets, Carsten Hummelt, Christiane Oppenheimer-Stix, Paul Wagner
  • Method for improving the color number of trimethylolpropane
    Publication number: 20120178973
    Abstract: The present invention relates to a method for producing trimethylolpropane having a low color number by processing a raw reaction solution obtained according to the inorganic Cannizarro process while adhering to precisely defined pH values.
    Type: Application
    Filed: August 6, 2010
    Publication date: July 12, 2012
    Applicant: LANXESS DEUTSCHLAND GMBH
    Inventors: Ulrich Notheis, Hans-Dieter Gerriets, Michael Friederich
  • Method for improving the color number of trimethylolpropane
    Patent number: 8003830
    Abstract: The present invention relates to a method for the production of trimethylolpropane with a low color number by treatment with activated carbon.
    Type: Grant
    Filed: March 20, 2008
    Date of Patent: August 23, 2011
    Assignee: LANXESS Deutschland GmbH
    Inventors: Wolfgang Mägerlein, Ulrich Notheis, Michael Friederich, Hans-Dieter Gerriets, Heinrich Grizinia, Paul Wagner
  • METHOD FOR IMPROVING THE COLOR NUMBER OF TRIMETHYLOLPROPANE
    Publication number: 20100137656
    Abstract: The present invention relates to a method for the production of trimethylolpropane with a low color number by treatment with activated carbon.
    Type: Application
    Filed: March 20, 2008
    Publication date: June 3, 2010
    Applicant: LANXESS DEUTSCHLAND GMBH
    Inventors: Wolfgang Mägerlein, Ulrich Notheis, Michael Friederich, Hans-Dieter Gerriets, Heinrich Grizinia, Paul Wagner