Patents by Inventor Donald J. Schuster

Donald J. Schuster 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).

  • Coupler intermediates and their formation
    Patent number: 5214194
    Abstract: A process for the preparation of 5-substituted 2-aminophenols via nitrones, comprises two reactions. First, a nitrone is reacted with a trihaloacetyl halide to regiospecifically convert the nitrone to a 5-substituted-2-aminophenol derivative (I). Subsequently, the derivative is hydrolyzed to form the 5-substituted-2-aminophenol. The product is useful as a chemical intermediate, e.g. for the preparation of couplers used in photographic chemistry.
    Type: Grant
    Filed: September 24, 1991
    Date of Patent: May 25, 1993
    Assignee: Eastman Kodak Company
    Inventors: Ping-Wah Tang, Jeffrey R. Neff, Frank T. Melia, Donald J. Schuster