Patents by Inventor Kerstin Herbst

Kerstin Herbst 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).

  • Powder composition for the preparation of an opaque dental porcelain in the form of a paste
    Patent number: 5679144
    Abstract: A powder composition for the preparation of an opaque dental porcelain, containing as its componentsone or more feldspar frits consisting of a number of feldspar frits of different chemical compositions and different physical properties;CeO.sub.2 as the opacifier, optionally additional opacifiers; andoptionally pigments.
    Type: Grant
    Filed: June 7, 1996
    Date of Patent: October 21, 1997
    Assignee: Vita Zahnfabrik H. Rauter GmbH & Co.
    Inventors: Norbert Thiel, Kerstin Herbst