Patents by Inventor Gundula Kiefer

Gundula Kiefer 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).

  • Sintered shaped body reinforced with platelets
    Patent number: 6452957
    Abstract: The invention relates to a sintered shaped body comprising a matrix material that contains an aluminum oxide/chromium oxide mixed crystal and an additional mixed crystal selected from at least one mixed crystal according to one of the general formulas La0.9Al11.76−xCrxO19, Me1Al11−xCrxO17, Me2Al12−xCrxO19, Me2′Al12−xCrxO19 and/or Me3Al11−xCrxO18, wherein Me1 stands for an alkali metal, Me2 represents an alkaline earth metal, Me2′ stands for cadmium, lead or mercury and Me3 represents a rare earth metal and x has a value ranging from 0.0007 to 0.045.
    Type: Grant
    Filed: July 6, 2000
    Date of Patent: September 17, 2002
    Assignee: Ceramtec AG Innovative Ceramic Engineering
    Inventors: Wolfgang Burger, Gundula Kiefer, Eduardo Bellido, Hans Andersch