Patents by Inventor Rajagopala Pillai

Rajagopala 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).

  • High strength corrosion resistant high velocity oxy fuel (HVOF) coating for downhole tools
    Patent number: 10590704
    Abstract: A downhole tool comprises a body made of a metal or metal alloy. In addition, the downhole tool comprises a coating disposed on the body. The coating includes at least 75 vol % tungsten carbide having an average grain size less than 1.0 ?m. The content of tungsten carbide in the coating with a grain size less than 0.5 ?m is between 40 and 64 vol % of the coating.
    Type: Grant
    Filed: June 28, 2012
    Date of Patent: March 17, 2020
    Assignee: NATIONAL OILWELL VARCO, L.P.
    Inventors: Jiinjen Albert Sue, Harold Sreshta, Rajagopala Pillai
  • Anti-Balling Drill Bit and Method of Making Same
    Publication number: 20180016848
    Abstract: A drill bit for drilling a wellbore penetrating a subterranean formation is disclosed. The drill bit includes a bit body having a surface about a working end thereof, ribs extending from the surface of the bit body with channels defined therebetween, cutting elements positionable on the ribs to cuttingly engage the subterranean formation and release cuttings therefrom, and an anti-balling composition. The anti-balling composition includes a hardphase having a chemical potential that is more electronegative than the surface. The anti-balling composition is disposed on a surface of the bit body whereby the cuttings from the wellbore are prevented from collecting on the bit body.
    Type: Application
    Filed: January 26, 2016
    Publication date: January 18, 2018
    Inventors: Anil Kumar, Walter R. Rothrock, Jr., Rajagopala Pillai
  • High Strength Corrosion Resistant High Velocity Oxy Fuel (HVOF) Coating for Downhole Tools
    Publication number: 20150322719
    Abstract: A downhole tool comprises a body made of a metal or metal alloy. In addition, the downhole tool comprises a coating disposed on the body. The coating includes at least 75 vol % tungsten carbide having an average grain size less than 1.0 ?m. The content of tungsten carbide in the coating with a grain size less than 0.5 ?m is between 40 and 64 vol % of the coating.
    Type: Application
    Filed: June 28, 2012
    Publication date: November 12, 2015
    Applicant: NATIONAL OILWELL VARCO, L.P.
    Inventors: Jiinjen Albert Sue, Harold Sreshta, Rajagopala Pillai
  • High thermal conductivity hardfacing
    Patent number: 8535408
    Abstract: A hardmetal composition comprises tungsten carbide in an amount greater than 50 weight percent of the hardmetal composition. In addition, the hardmetal composition comprises a binder material consisting of at least 90 weight percent nickel, a binder flux between 3.5 to 10.0 weight percent chosen from the group consisting of boron and silicon, and less than 1.0 weight percent other components.
    Type: Grant
    Filed: January 24, 2012
    Date of Patent: September 17, 2013
    Assignee: Reedhycalog, L.P.
    Inventors: Jiinjen Albert Sue, Harold Sreshta, Rajagopala Pillai
  • High Thermal Conductivity Hardfacing
    Publication number: 20130020136
    Abstract: A hardmetal composition comprises tungsten carbide in an amount greater than 50 weight percent of the hardmetal composition. In addition, the hardmetal composition comprises a binder material consisting of at least 90 weight percent nickel, a binder flux between 3.5 to 10.0 weight percent chosen from the group consisting of boron and silicon, and less than 1.0 weight percent other components.
    Type: Application
    Filed: January 24, 2012
    Publication date: January 24, 2013
    Applicant: REEDHYCALOG, L.P.
    Inventors: Jiinjen Albert Sue, Harold Sreshta, Rajagopala Pillai