Patents by Inventor Manfred Letsch

Manfred Letsch 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).

  • Lacquering process using nacreous pigments
    Patent number: 4668570
    Abstract: Base lacquers suitable for use in multi-layer lacquerings containing a layer of base lacquer and a layer of clear lacquer on top of this, contain a nacreous pigment based on mica flakes coated with metal oxides, wherein the nacreous pigments have a particle size substantially in the range between 5 and 25 .mu.m. The resultant lacquerings have advantageous properties.
    Type: Grant
    Filed: June 19, 1986
    Date of Patent: May 26, 1987
    Assignees: Merck Patent Gesellschaft mit beschraenketer Haftung, Herberts GmbH
    Inventors: Reiner Esselborn, Klaus Ambrosius, Hans-Joachim Graetz, Manfred Letsch