Patents by Inventor Hans-Georg Stahl

Hans-Georg Stahl 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).

  • Aqueous polyurethane stoving lacquers and the use thereof for the production of lacquer films and coatings
    Patent number: 4608413
    Abstract: The present invention is directed to aqueous stoving lacquers containing pigments or fillers wherein the binders are based on combinations of (a) polyurethane prepolymers containing partly or completely neutralized carboxyl groups and blocked isocyanate groups and (b) polyurethane prepolymers containing free hydroxyl groups and partly or completely neutralized carboxyl groups. The binder components are further characterized by polyester and polyether segments, each being present in amounts of greater than 10% by weight.The present invention is also directed to films and coatings prepared from these aqueous stoving lacquers.
    Type: Grant
    Filed: December 7, 1984
    Date of Patent: August 26, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Klaus Nachtkamp, Jurgen Schwindt, Karl-Ludwig Noble, Hans-Georg Stahl
  • Process for the production of aqueous dispersions and use thereof for the production of metal effect lacquer coatings
    Patent number: 4594374
    Abstract: Aqueous dispersions based on selected polyesters and/or acrylate resins, water-soluble aminoplast resins, emulsifiers, aluminium bronze, organic solvents and optionally further auxiliaries are suitable for the production of metal effect lacquer coatings by the two-layer wet-in-wet lacquering process.
    Type: Grant
    Filed: February 28, 1985
    Date of Patent: June 10, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Georg Stahl, Jurgen Schwindt, Klaus Nachtkamp