Patents by Inventor Roberta R. Yeckley

Roberta R. Yeckley 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).

  • Patent number: 8501050
    Abstract: Composite materials comprising titanium diboride, silicon carbide and carbon-containing scavenger additions are useful in electrolytic aluminum production cells. The carbon-containing scavenger additions may include tungsten carbide, boron carbide and/or carbon. The amounts of titanium diboride, silicon carbide and carbon-containing scavenger are controlled in order to provide optimum performance. The titanium diboride/silicon carbide composite materials may be used as cathodes in electrolytic aluminum production cells and are electrically conductive, exhibit desirable aluminum wetting behavior, and are capable of withstanding exposure to molten cryolite, molten aluminum and oxygen at elevated temperatures during operation of such cells.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: August 6, 2013
    Assignee: Kennametal Inc.
    Inventors: Sean Erin Landwehr, Roberta R. Yeckley
  • Publication number: 20130075669
    Abstract: Composite materials comprising titanium diboride, silicon carbide and carbon-containing scavenger additions are useful in electrolytic aluminum production cells. The carbon-containing scavenger additions may include tungsten carbide, boron carbide and/or carbon. The amounts of titanium diboride, silicon carbide and carbon-containing scavenger are controlled in order to provide optimum perfonnance. The titanium diboride/silicon carbide composite materials may be used as cathodes in electrolytic aluminum production cells and are electrically conductive, exhibit desirable aluminum wetting behavior, and are capable of withstanding exposure to molten cryolite, molten aluminum and oxygen at elevated temperatures during operation of such cells.
    Type: Application
    Filed: September 28, 2011
    Publication date: March 28, 2013
    Applicant: Kennametal Inc.
    Inventors: Sean Erin Landwehr, Roberta R. Yeckley