Patents by Inventor Mark Cippel

Mark Cippel 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).

  • Multiple grade cemented carbide articles and a method of making the same
    Patent number: 5543235
    Abstract: The present invention provides multiple grade, composite cemented carbide articles and a method of making such articles. The cemented carbide articles comprise carbides of different grades (or different compositions and/or microstructures) and, therefore, correspondingly different properties at different locations in the same article. The method of the present invention comprises filling different areas or portions of a die with metallurgical powders having different compositions and/or microstructures. The powder is then compressed as a single compact in the die cavity. The compressed compact is subsequently sintered to produce a multigrade cemented carbide article having composition and/or microstructural variations within the volume of the article.
    Type: Grant
    Filed: April 26, 1994
    Date of Patent: August 6, 1996
    Assignee: SinterMet
    Inventors: Prakash K. Mirchandani, Robert E. Thomas, Mark Cippel