Patents Assigned to Hercules, Inc.
  • Oxime-linked polysaccharides and methods of preparing the same
    Patent number: 6846923
    Abstract: Polysaccharides comprising one or more oxime linkages are provided. Methods for their preparation include the polycondensation of saccharides bearing oxime-forming substituents. In some embodiments, polymerization is conducted in the presence of galactose oxidase. The resulting oxime-linked polysaccharides have desirable properties and are useful in numerous applications including paper manufacturing and drug delivery vehicles.
    Type: Grant
    Filed: September 18, 2001
    Date of Patent: January 25, 2005
    Assignee: Hercules, Inc.
    Inventors: Peng George Wang, Wenhua Xie, Lei Qiao, Huai N. Cheng, Dennis J. Murphy, Qu-Ming Gu
  • Compounds and methods for stabilization of furfural compositions
    Patent number: 6384249
    Abstract: Inhibitor compounds containing a moiety according to this invention are used to inhibit air oxidation and thermal polymerization of furfural or furfural derivatives. A process is provided for use of the inhibitors in the solvent refining of lubricating oils where furfural is used to extract impurities including polycyclic aromatic and oxygen-containing compounds from the lubricating oils. The process provides for combination of the inhibitor with a continuously recirculating furfural stream in the extraction process.
    Type: Grant
    Filed: October 17, 2000
    Date of Patent: May 7, 2002
    Assignee: Hercules, Inc.
    Inventors: James G. Edmondson, Grace B. Arhancet