Patents Represented by Attorney, Agent or Law Firm John R. VanOphem
  • Patent number: 6235128
    Abstract: The present invention is a unique sequential process for treating carbon and alloy steels to improve resistance to tribological stresses while reducing conventional processing time required to obtain articles having a similar hardness. This process comprises carburizing or carbonitriding the article, tempering the carburized or carbonitrided article, net-shaping (machining) the tempered article, and plasma (ion) nitriding the tempered article for a significantly reduced period of time versus conventional plasma (ion) nitriding.
    Type: Grant
    Filed: March 8, 1999
    Date of Patent: May 22, 2001
    Inventors: John C. Chang, John Joseph Krieg, Richard Blanco Roe, Steve Stormzand, Tony Wu, Lynn Lu, Jeffrey W. Kunitzer