Patents by Inventor Rita Loew

Rita Loew 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).

  • Method of producing decorations which are color-stable in a porcelain firing and a pigment composition suitable therefor
    Patent number: 5389402
    Abstract: A method for producing decorations which are color-stable in a porcelain firing (glost firing), and a pigment composition suitable for this method, is disclosed. Inclusion pigments based on heavy-metal sulfides and selenides in an oxidic or silicate casing, especially ZrSiO.sub.4, result in more color-stable decorations in a porcelain firing if color-stabilizing auxiliary agents from the series of Zn compounds, especially ZnO or zinc-containing glass frits, or cerium(III) or cerium(IV) compounds, especially CeO.sub.2, are used in the decorative layer and/or glaze layer as color-stabilizing auxiliary agents. The amount used in the decorative layer is generally 5 to 50% by weight in the case of ZnO and CeO.sub.2, relative to the inclusion pigment. The pigment composition contains at least one of the color-stabilizing auxiliary agents in addition to an inclusion pigment.
    Type: Grant
    Filed: May 12, 1993
    Date of Patent: February 14, 1995
    Assignee: Degussa Aktiengesellschaft
    Inventors: Dietrich Speer, Akos Kiss, Jenny Horst, Guenter Halbritter, Rita Loew