Patents Examined by Nichole Gay
  • Modified low temperature case hardening processes
    Patent number: 6547888
    Abstract: An iron-containing workpiece is case hardened by low temperature carburization during which one or more process steps—including adjusting the carburization temperature, adjusting the concentration of carburization specie in the carburization gas and reactivating the surfaces to be carburized—is carried out to enhance the overall rate and uniformity of carburization with minimized soot generation, whereby carburization can be completed faster than possible in the past.
    Type: Grant
    Filed: January 28, 2000
    Date of Patent: April 15, 2003
    Assignee: Swagelok Company
    Inventors: Peter C. Williams, Steven V. Marx