Patents by Inventor Vasile Oprea

Vasile Oprea 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).

  • Post weld heat treatment for chemically stabilized austenitic stainless steel
    Patent number: 7837810
    Abstract: Thermo-mechanical properties of welds in stainless steel is substantially improved by the implementation of a post weld heat treatment that illiminates sigma phase in the heat treated zone and favors niobium carbonitride precipitate formation in a desirable size range. In most cases, post weld heat treated material can be employed in pressurized devices at temperatures exceeding 550° C., which is currently regarded the upper safe temperature limit, and material according to the inventive subject matter was tested at temperature of up to 850° C. without reheat cracking.
    Type: Grant
    Filed: June 16, 2004
    Date of Patent: November 23, 2010
    Assignee: Fluor Technologies Corporation
    Inventors: Barry Messer, Terrell T. Phillips, Vasile Oprea
  • Post weld heat treatment for chemically stabilized austenitic stainless steel
    Publication number: 20090020191
    Abstract: Thermo-mechanical properties of welds in stainless steel is substantially improved by the implementation of a post weld heat treatment that iliminates sigma phase in the heat treated zone and favors niobium carbonitride precipitate formation in a desirable size range. In most cases, post weld heat treated material can be employed in pressurized devices at temperatures exceeding 550° C., which is currently regarded the upper safe temperature limit, and material according to the inventive subject matter was tested at temperature of up to 850° C. without reheat cracking.
    Type: Application
    Filed: June 16, 2004
    Publication date: January 22, 2009
    Inventors: Barry Messer, Terrell T. Phillips, Vasile Oprea