Patents by Inventor Tapas K. Mukherji

Tapas K. Mukherji 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).

  • Alpha case removal process for a main rotor blade spar
    Patent number: 10155298
    Abstract: A method of removing an alpha case from a rotor blade by directing a water jet to mill a surface of a rotor blade spar to remove an Alpha-case therefrom.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: December 18, 2018
    Assignee: SIKORSKY AIRCRAFT CORPORATION
    Inventors: Robert J. Araujo, Tapas K. Mukherji
  • COATING AND SURFACE REPAIR METHOD
    Publication number: 20170114439
    Abstract: A coating and surface repair method is provided. The method includes positioning a high velocity air fuel (HVAF) gun proximate to a damaged hardened steel surface and forming a ceramic metallic coating on the damaged hardened steel surface by executing an HVAF thermal spray process using the HVAF gun.
    Type: Application
    Filed: April 16, 2015
    Publication date: April 27, 2017
    Inventors: Ibibia Altraide, Tapas K. Mukherji, Michael F. Mullen
  • Refurbishing method and system for a main rotor blade spar
    Patent number: 8800145
    Abstract: A method of refurbishing a rotor blade utilizing a waterjet and an apparatus therefore.
    Type: Grant
    Filed: December 30, 2008
    Date of Patent: August 12, 2014
    Assignee: Sikorsky Aircraft Corporation
    Inventors: Tapas K. Mukherji, Robert J. Araujo
  • Gear material for an enhanced rotorcraft drive system
    Patent number: 8758527
    Abstract: A surface processing method includes the step of increasing a surface hardness of a metal having a nominal composition that includes about 0.21-0.25 wt % carbon, about 2.9-3.3 wt % chromium, about 11-12 wt % nickel, about 13-14 wt % cobalt, about 1.1-1.3 wt % molybdenum, and a balance of iron from a first hardness to a second hardness. For example, the method is used to produce a surface-hardened component that includes a core section having a first hardness between about 51 HRC and 55 HRC and a case section having a second hardness that is greater than the first hardness.
    Type: Grant
    Filed: December 15, 2006
    Date of Patent: June 24, 2014
    Assignee: Sikorsky Aircraft Corporation
    Inventors: Tapas K. Mukherji, Michael E. Dandorph, Bruce D. Hansen, Edward J. Karedes
  • ALPHA CASE REMOVAL PROCESS FOR A MAIN ROTOR BLADE SPAR
    Publication number: 20130165024
    Abstract: A method of removing an alpha case from a rotor blade by directing a water jet to mill a surface of a rotor blade spar to remove an Alpha-case therefrom.
    Type: Application
    Filed: December 21, 2011
    Publication date: June 27, 2013
    Inventors: Robert J. Araujo, Tapas K. Mukherji
  • REFURBISHING METHOD AND SYSTEM FOR A MAIN ROTOR BLADE SPAR
    Publication number: 20100162565
    Abstract: A method of refurbishing a rotor blade utilizing a waterjet and an apparatus therefore.
    Type: Application
    Filed: December 30, 2008
    Publication date: July 1, 2010
    Inventors: Tapas K. Mukherji, Robert J. Araujo
  • GEAR MATERIAL FOR AN ENHANCED ROTORCRAFT DRIVE SYSTEM
    Publication number: 20080145690
    Abstract: A surface processing method includes the step of increasing a surface hardness of a metal having a nominal composition that includes about 0.21-0.25 wt % carbon, about 2.9-3.3 wt % chromium, about 11-12 wt % nickel, about 13-14 wt % cobalt, about 1.1-1.3 wt % molybdenum, and a balance of iron from a first hardness to a second hardness. For example, the method is used to produce a surface-hardened component that includes a core section having a first hardness between about 51 HRC and 55 HRC and a case section having a second hardness that is greater than the first hardness.
    Type: Application
    Filed: December 15, 2006
    Publication date: June 19, 2008
    Inventors: Tapas K. Mukherji, Michael E. Dandorph, Bruce D. Hansen, Edward J. Karedes