Patents by Inventor Rod K. Hackman

Rod K. Hackman 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).

  • Multi-stage glycolic acid crystallization
    Patent number: 7439391
    Abstract: The present invention relates to a high yield process to prepare high purity crystalline glycolic acid using a multi-loop crystallization process characterized by high liquid and/or solid recycle, said process suitable for large scale purification and producing high purity glycolic acid with low diglycolic acid content.
    Type: Grant
    Filed: October 11, 2007
    Date of Patent: October 21, 2008
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: F. Glenn Gallagher, Rod K. Hackman, Daniel Albert Green
  • Multi-stage glycolic acid crystallization
    Publication number: 20080091047
    Abstract: The present invention relates to a high yield process to prepare high purity crystalline glycolic acid using a multi-loop crystallization process characterized by high liquid and/or solid recycle, said process suitable for large scale purification and producing high purity glycolic acid with low diglycolic acid content.
    Type: Application
    Filed: October 11, 2007
    Publication date: April 17, 2008
    Inventors: F. Glenn Gallagher, Rod K. Hackman, Daniel Albert Green