Patents by Inventor Udo Hoffmann

Udo Hoffmann 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 the coating of electrically conductive substrates and a cathodically depositable aqueous electrocoating paint
    Patent number: 5338434
    Abstract: The invention relates to aqueous electrocoating paints which contain 2 to 10% by weight of an anticorrosive pigment based on zinc silicate in combination with 1 to 15% by weight of a very fine quartz powder or cristobalite powder coated with epoxysilane or aminosilane, the percentages by weight being based on the total solids content of the electrocoating paint and the anticorrosive pigment being preparable by fusing together 35 to 65% by weight of ZnO, 15 to 35% by weight of SiO.sub.2 and 0 to 20% by weight of B.sub.2 O.sub.3 and/or 0 to 20% by weight of WO.sub.3 and/or 0 to 20% by weight of MoO.sub.3 and/or 0 to 20% by weight of SnO.sub.2, the components being fused together using at least one of the cited oxides besides ZnO and SiO.sub.2 in such a manner that the percentages by weight always total 100.
    Type: Grant
    Filed: January 11, 1993
    Date of Patent: August 16, 1994
    Assignee: BASF Lacke & Farben Aktiengesellschaft
    Inventors: Dieter Ruhl, Klaus Arlt, Ulrich Heilmann, Ulrich Heimann, Udo Hoffmann