Cyano, Nitrogen Or Sulfur Bonded Directly To The Nonacyclo Ring System Patents (Class 552/277)
Halogen containing or processes wherein a halogen containing material is utilized (Class 552/278)
  • Fluorescent dyes
    Patent number: 6215008
    Abstract: Fluorescent dyes which fluoresce a variety of colors are prepared from substituted isoviolanthrone and substituted isoviolanthrone by reductive alkylation with alkyl halides in the presence of zinc.
    Type: Grant
    Filed: December 3, 1999
    Date of Patent: April 10, 2001
    Assignee: Rohm and Haas Company
    Inventor: Peter J. Heffron