Patents by Inventor Johann Ostermeier

Johann Ostermeier 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).

  • Azo pigment formulations
    Patent number: 4515639
    Abstract: Intense azo pigment formulations which have good flow and are readily dispersible are obtained on adding a long-chain aliphatic primary amine and a diamine of the formulaH.sub.2 N--A--NH.sub.2in which A is an aliphatic hydrocarbon radical having 6 to 30 C atoms, before, during or preferably after the coupling. The formulations are in particular suitable for intaglio printing inks which produce glossy prints which do not even strike through thin papers.
    Type: Grant
    Filed: February 5, 1982
    Date of Patent: May 7, 1985
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Peter Dopfer, Johann Ostermeier, Siegfried Schwerin