Patents by Inventor Rudolf K. Grau

Rudolf K. Grau 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 boron nitride body and method for producing a sintered boron nitride body
    Patent number: 9862163
    Abstract: In order to provide a sintered, hexagonal boron nitride body (2a, 2b), same is produced by at least one pressing process and subsequent sintering process from a powder (P) made of a hexagonal boron nitride, its density being deliberately set to a value of <1.6 g/cm3. Studies have shown that, due to the selection of this lower density, the boron nitride body (2a, 2b) exhibits very high isotropy, when compared with conventional hexagonal boron nitride bodies. This relates in particular to thermal conductivity and the coefficient of thermal expansion, which are also largely temperature-independent.
    Type: Grant
    Filed: November 21, 2014
    Date of Patent: January 9, 2018
    Assignee: KENNAMETAL INC.
    Inventors: Rudolf K. Grau, Rodrigue N. Yappi, Hubert J. Schweiger
  • SINTERED BORON NITRIDE BODY AND METHOD FOR PRODUCING A SINTERED BORON NITRIDE BODY
    Publication number: 20150147520
    Abstract: In order to provide a sintered, hexagonal boron nitride body (2a, 2b), same is produced by at least one pressing process and subsequent sintering process from a powder (P) made of a hexagonal boron nitride, its density being deliberately set to a value of <1.6 g/cm3. Studies have shown that, due to the selection of this lower density, the boron nitride body (2a, 2b) exhibits very high isotropy, when compared with conventional hexagonal boron nitride bodies. This relates in particular to thermal conductivity and the coefficient of thermal expansion, which are also largely temperature-independent.
    Type: Application
    Filed: November 21, 2014
    Publication date: May 28, 2015
    Inventors: Rudolf K. Grau, Rodrigue N. Yappi, Hubert J. Schweiger