Patents by Inventor Wassilis Koumbouris

Wassilis Koumbouris 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 the preparation of 4-(2-aminophenylthio)naphthalic anhydride derivatives
    Patent number: 5347019
    Abstract: 4-(2-Aminophenylthio)naphthalic anhydride derivatives are obtained in good yields and purities by reaction of 2-aminothiophenolates with 4-chloro- or 4-bromonaphthalic anhydrides having a particle size of at most 50 .mu.m.
    Type: Grant
    Filed: May 18, 1993
    Date of Patent: September 13, 1994
    Assignee: Cassella AG
    Inventors: Wolfgang Bauer, Wassilis Koumbouris