Patents by Inventor Martin Wienkenhover

Martin Wienkenhover 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).

  • Process for improving the adherency of metallic coatings deposited without current on plastic surfaces
    Patent number: 5182135
    Abstract: Activator formulations which contain an aromatic polyurethane as binder are highly suitable for the preparation of non-metallic substrate surfaces for currentless metallization.The metal coatings produced are distinguished by good adhesion.
    Type: Grant
    Filed: March 18, 1991
    Date of Patent: January 26, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Henning Giesecke, Gerhard D. Wolf, Hanns P. Muller, Ulrich von Gizycki, Martin Wienkenhover
  • New polyisocyanate-polyaddition compounds, a process for their preparation and their use for the dispersion of solids
    Patent number: 4929705
    Abstract: New polyisocyanate-polyaddition compounds, a process for their preparation and their use as wetting or dispersing agents for the incorporation of solids, in particular pigments, in lacquer or synthetic resin formulation.
    Type: Grant
    Filed: March 28, 1989
    Date of Patent: May 29, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jan Mazanek, Ulrich von Gizycki, Hanns P. Muller, Martin Wienkenhover, Karl-Heinz Wieser, Volker Paulat, Werner Theuer, Walter Muller
  • Pigment preparations
    Patent number: 4909853
    Abstract: Pigment preparations which contain an organic pigment and/or carbon black and a surfactant from the sulphosuccinic acid ester and/or alkylbenzenesulphonate series and which have been dried, if appropriate after wet comminution, by spray- or freeze-drying from an aqueous medium, and the use of these preparations for pigmenting high molecular weight organic material, in particular thermoplastics.
    Type: Grant
    Filed: March 1, 1988
    Date of Patent: March 20, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Martin Wienkenhover, Volker Paulat, Wolfgang Karnath, Hans Schulze, Karlheinz Wolf, Karl-Heinz Wieser
  • Process for the preparation of naphthalene-1,8-dicarboximides
    Patent number: 4892950
    Abstract: Process for the preparation of naphthalene-1,8-dicarboximide which is optionally substituted in the naphthalene ring, characterized in that naphthalene-1,8-dicarboxylic anhydride which is optionally substituted in the naphthalene ring is reacted with an ammonium salt in an aqueous medium at a pH near to the neutral point, the reaction mixture is then acidified to a pH of 1 to 4 and the pH is subsequently adjusted to a value near to the neutral point.
    Type: Grant
    Filed: June 9, 1988
    Date of Patent: January 9, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Detlef-Ingo Schutze, Klaus Wunderlich, Karl-Heinz Reinhardt, Martin Wienkenhover