Patents by Inventor Dirk Jan Vermaas

Dirk Jan Vermaas 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 selective oxidation of primary alcohols of oligosaccharides
    Patent number: 6310200
    Abstract: The invention relates to a process for the selective oxidation of primary alcohols of oligosaccharides to form the corresponding carboxylic acid derivatives of the alcohols using catalytic amounts of a di-tertiary-alkyl nitroxyl free radical, characterized in that 1,3-dibromo-5,5-dimethylhydantoin or 1,3-dichoro-5,5-dimethylbydantoin is used as oxidant and the reaction is performed in neutral to basic conditions at a pH<10. The process of the invention is useful for the production of (partially protected) oligosaccharides comprising carboxylate groups, both intermediates and end products.
    Type: Grant
    Filed: July 20, 1999
    Date of Patent: October 30, 2001
    Assignee: Akzo Nobel N.V.
    Inventor: Dirk Jan Vermaas