Patents by Inventor Erwin G. J. C. Warmerdam

Erwin G. J. C. Warmerdam 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 of preparing optically active cyanohydrin derivatives
    Patent number: 5493047
    Abstract: The invention relates to a method of preparing an optically active cyanohydrin carboxylic acid ester from an optically active cyanohydrin of opposite configuration, wherein said starting cyanohydrin is converted with a carboxylic acid in the presence of a dialkyl azodicarboxylate and a triarylphosphine.The invention also relates to a method of preparing an optically active cyanohydrin of opposite configuration by a subsequent solvolysis of the ester obtained under conservation of the configuration.
    Type: Grant
    Filed: December 6, 1993
    Date of Patent: February 20, 1996
    Assignee: Duphar International Research B.V.
    Inventors: Johannes Brussee, Arne Van Der Gen, Erwin G. J. C. Warmerdam, Chris G. Kruse