Patents by Inventor Egon Liedeck

Egon Liedeck 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).

  • Diazo pigments
    Patent number: 4247296
    Abstract: A diazo pigment dye having the formula ##STR1## in which R.sub.1 represents a hydrogen, chlorine or bromine atom or a nitro group, andR.sub.2 and R.sub.3 a hydrogen or chlorine atom or a methyl or methoxy group.A new coupling component for preparing the pigment is also disclosed. The dye possesses good tinctorial and advantageous environmental properties. Methods for preparing the dye are disclosed.
    Type: Grant
    Filed: September 19, 1979
    Date of Patent: January 27, 1981
    Assignee: BASF Farben & Fasern AG
    Inventors: Egon Liedeck, Wolfgang Ruff, Gerhard Berger, Peter Reiter