Patents by Inventor Hans-Ulrich Woelk

Hans-Ulrich Woelk 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 recovering pure crystalline monoanhydrohexitols and dianhydrohexitols
    Patent number: 4564692
    Abstract: A simplified economical process is provided for preparing pure anhydro sugar alcohols by a controlled crystallization from concentrated aqueous solutions or melts containing these alcohols. These pure anhydro sugar alcohols are useful as polyol components in making polyester and polyurethane polymers.
    Type: Grant
    Filed: July 18, 1983
    Date of Patent: January 14, 1986
    Assignee: CPC International Inc.
    Inventors: John Feldmann, Hubert Koebernick, Klaus Richter, Hans-Ulrich Woelk