Patents by Inventor Raju PILLAI

Raju PILLAI 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).

  • Laser cladding Fe—Cr alloy on downhole tools
    Patent number: 9382596
    Abstract: A hardfacing composition composed of an Fe—Cr alloy. The alloy is comprised of 80 wt % iron, about 2 wt % to about 20 wt % Cr, less than 1 wt % Si and less than 1 wt % C. The alloy's microstructure is at least 80 vol % martensite; and less than 20 vol % austenite.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: July 5, 2016
    Assignee: National Oilwell Varco, L.P.
    Inventors: Raju Pillai, Jiinjen A. Sue, Parul W. Dhall
  • Laser hardened surface for wear and corrosion resistance
    Patent number: 8858733
    Abstract: A method of laser hardening comprises irradiating a surface of a component with a laser beam to form a first band of irradiated material, irradiating the surface of the component with the laser beam to form a second band of irradiated material that overlaps the first band of irradiated material, where the first band and the second band have a pitch to width ratio of between about 0.5 and about 0.78.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: October 14, 2014
    Assignee: National Oilwell Varco, L.P.
    Inventors: Raju Pillai, Jiinjen Albert Sue, Unnikrishnan Vasudevan
  • LASER HARDENED SURFACE FOR WEAR AND CORROSION RESISTANCE
    Publication number: 20130068741
    Abstract: A method of laser hardening comprises irradiating a surface of a component with a laser beam to form a first band of irradiated material, irradiating the surface of the component with the laser beam to form a second band of irradiated material that overlaps the first band of irradiated material, where the first band and the second band have a pitch to width ratio of between about 0.5 and about 0.78.
    Type: Application
    Filed: September 21, 2011
    Publication date: March 21, 2013
    Applicant: NATIONAL OILWELL VARCO, L.P
    Inventors: Raju Pillai, Jiinjen Albert Sue, Unnikrishnan Vasudevan
  • LASER CLADDING FE-CR ALLOY ON DOWNHOLE TOOLS
    Publication number: 20130068449
    Abstract: A hardfacing composition composed of an Fe—Cr alloy. The alloy is comprised of 80 wt % iron, about 2 wt % to about 20 wt % Cr, less than 1 wt % Si and less than 1 wt % C. The alloy's microstructure is at least 80 vol % martensite; and less than 20 vol % austenite.
    Type: Application
    Filed: September 16, 2011
    Publication date: March 21, 2013
    Applicant: NATIONAL OILWELL VARCO,LP.
    Inventors: Raju PILLAI, Jiinjen A. SUE, Parul W. DHALL