Patents Examined by H. David Welsh
  • Toners and yellow dye compounds used therein
    Patent number: 4734349
    Abstract: Novel cyano hydroxy pyridone monoazo yellow dye compounds are useful in thermoplastic electrostatographic toners. They absorb at the desired wavelength, are lightfast and have high tinctorial strength. They resist decomposition, sublimation and bleeding upon being thermally fixed to a substrate. For use in color transparencies, these dyes form a transparent toner image.
    Type: Grant
    Filed: September 22, 1986
    Date of Patent: March 29, 1988
    Assignee: Eastman Kodak Company
    Inventors: Derek D. Chapman, Julie P. Harmon