Patents by Inventor Richard Castenson

Richard Castenson 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).

  • Azoacylacetamide dispersing agents and azo-pigment compositions
    Patent number: 4664709
    Abstract: This invention is directed to new azoacylacetamide dispersing agents for azo pigments and azo pigment compositions made therefrom. The pigment compositions of this invention comprise a mixture of dispersing agents which are represented below by abbreviated Formula I and pigments which are represented by the abbreviated Formula II, wherein said dispersing agents are present in an amount of 1-25% and said pigments are present in an amount of 99 to 75%: ##STR1## where: A is an aromatic or heterocyclic amino group;B is an aromatic or heterocyclic bisdiazonium group;D is an aliphatic polyamino group containing at least three nitrogen atoms.
    Type: Grant
    Filed: February 25, 1985
    Date of Patent: May 12, 1987
    Assignee: American Hoechst Corporation
    Inventor: Richard Castenson