Patents by Inventor Thomas Petry

Thomas Petry 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).

  • Patent number: 6225484
    Abstract: The invention relates to an improved process for the preparation of a compound of formula I wherein R1 represents an optionally substituted aryl group, R2 represents an optionally substituted alkyl group, and R3 and R4 each individually represent an alkyl group; which comprises heating a mixture of a compound of formula II an alcohol, a tri-alkoxymethane, an acid and, optionally, an inert diluent.
    Type: Grant
    Filed: August 12, 1999
    Date of Patent: May 1, 2001
    Assignee: American Cyanamid Co.
    Inventors: Werner Simon, Thomas Petry