Patents by Inventor Erwin Stark

Erwin Stark 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).

  • Condensation products based on rosin
    Patent number: 5073623
    Abstract: A rosin based condensation product produced by reacting in a multistage process the following reactants, rosin, phenolic compounds, formaldehyde, unsaturated C.sub.3 -C.sub.4 dicarboxylic acid or maleic anhydride, monounsaturated or polyunsaturated aliphatic monohydric or dihydric alcohol or amine or a monounsaturated or polyunsaturated C.sub.2 -C.sub.12 aminoalcohol or C.sub.2 -C.sub.12 alkanediol or C.sub.2 -C.sub.12 aminoalcohol, monounsaturated or polyunsaturated C.sub.8 C.sub.40 fatty acid.
    Type: Grant
    Filed: September 6, 1989
    Date of Patent: December 17, 1991
    Assignee: BASF Lacke+Farben Aktiengesellschaft
    Inventors: Bernhard Prantl, Rolf Walz, Erwin Stark