Patents by Inventor Christopher R. Patriarca

Christopher R. Patriarca 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).

  • Shielding gas to reduce weld hot cracking
    Patent number: 5306358
    Abstract: An inert gas nitrogen mixture is used as a shielding gas to prevent weld hot cracking in superalloys containing zirconium and/or boron. The gas mixture preferably contains argon and about 2 to 8% by volume nitrogen. Test data show excellent results are obtained when gas tungsten arc welding HAYNES 214 alloy which normally contains boron and zirconium and a minimal content of titanium.
    Type: Grant
    Filed: August 20, 1991
    Date of Patent: April 26, 1994
    Assignee: Haynes International, Inc.
    Inventors: George Y. Lai, Robert B. H. Herchenroeder, Christopher R. Patriarca