Patents by Inventor Mark Lindsay Dittenhafer

Mark Lindsay Dittenhafer 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 and apparatus for determination of water and for normal phase liquid chromatography
    Patent number: 7419831
    Abstract: A method for calibrating an analysis instrument, e.g., a gas chromatograph, for water analysis that includes four steps. The first step is to continuously remove water from a liquid that contains water to produce a liquid containing a reduced amount of water such as by membrane pervaporation. The second step is to analyze the liquid containing a reduced amount of water for water by a reference water analysis method such as by Karl Fischer titration. The third step is to analyze the stream of liquid containing a reduced amount of water using the instrument to be calibrated, e.g., a gas chromatograph having a helium photoionization pulse discharge detector. The fourth step is to calibrate the instrument using the analysis of the second step. In a related embodiment, a system for normal phase chromatography.
    Type: Grant
    Filed: August 20, 2002
    Date of Patent: September 2, 2008
    Assignee: Dow Global Technologies, Inc.
    Inventors: Nile Nelson Frawley, Jeffrey Robert Larson, Mark William Beach, Mark Lindsay Dittenhafer, Steven Randall Erskine, Joseph J. Kiefer
  • Method and apparatus for determination of water and for normal phase liquid chromatography
    Publication number: 20040241863
    Abstract: A method for calibrating an analysis instrument, e.g., a gas chromatograph, for water analysis that includes four steps. The first step is to continuously remove water from a liquid that contains water to produce a liquid containing a reduced amount of water such as by membrane pervaporation. The second step is to analyze the liquid containing a reduced amount of water for water by a reference water analysis method such as by Karl Fischer titration. The third step is to analyze the stream of liquid containing a reduced amount of water using the instrument to be calibrated, e.g., a gas chromatograph having a helium photoionization pulse discharge detector. The fourth step is to calibrate the instrument using the analysis of the second step. In a related embodiment, a system for normal phase chromatography.
    Type: Application
    Filed: February 17, 2004
    Publication date: December 2, 2004
    Inventors: Nile N Frawley, Jeffrey Robert Larson, Mark William Beach, Mark Lindsay Dittenhafer, Steven Randall Erskine