Patents by Inventor Gajawalli V. Srinivasan

Gajawalli V. Srinivasan 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).

  • Patent number: 10376960
    Abstract: An additively manufactured alloy component has a first portion formed of the alloy and having a first grain size, and a second portion formed of the alloy and having a second grain size smaller than the first grain size. In an embodiment, the alloy component is an alloy turbine disk, the first portion is a rim region of the alloy turbine disk, and the second portion is a hub region of the alloy turbine disk. The first and second grain sizes may be achieved by controllably varying the laser power and/or scan speed during additive manufacturing.
    Type: Grant
    Filed: January 18, 2017
    Date of Patent: August 13, 2019
    Assignee: United Technologies Corporation
    Inventors: John A. Sharon, Daniel V. Viens, Tahany Ibrahim El-Wardany, Gajawalli V. Srinivasan, Joseph J. Sangiovanni, Ranadip Acharya
  • Patent number: 10239156
    Abstract: A method of forming a metal component having different regions containing different grain sizes and in porosities is by additive manufacturing. The method includes spreading a layer of starting powder on a temperature controlled moveable platform in a heated chamber with atmosphere and temperature control. Selected areas of the powder are melted and solidified with a computer controlled focused energy beam. The cooled platform is then indexed down and the process repeated. The grain size of the melted and solidified region can be controlled by the cooling rate during solidification which, in turn is controlled by the temperature of the chamber and the temperature of the cooled moveable platform.
    Type: Grant
    Filed: September 25, 2014
    Date of Patent: March 26, 2019
    Assignee: United Technologies Corporation
    Inventors: Shawn J. Gregg, Alexander Staroselsky, Gajawalli V. Srinivasan
  • Publication number: 20190062913
    Abstract: A method for fabricating a component according to an example of the present disclosure includes the steps of depositing a stoichiometric precursor layer onto a preform, and densifying the preform by depositing a matrix material onto the stoichiometric precursor layer. An alternate method and a component are also disclosed.
    Type: Application
    Filed: August 28, 2017
    Publication date: February 28, 2019
    Inventors: Ying She, Rajiv Ranjan, Zissis A. Dardas, Gajawalli V. Srinivasan, Lesia V. Protsailo
  • Publication number: 20180200798
    Abstract: An additively manufactured alloy component has a first portion formed of the alloy and having a first grain size, and a second portion formed of the alloy and having a second grain size smaller than the first grain size. In an embodiment, the alloy component is an alloy turbine disk, the first portion is a rim region of the alloy turbine disk, and the second portion is a hub region of the alloy turbine disk. The first and second grain sizes may be achieved by controllably varying the laser power and/or scan speed during additive manufacturing.
    Type: Application
    Filed: January 18, 2017
    Publication date: July 19, 2018
    Inventors: John A. Sharon, Daniel V. Viens, Tahany Ibrahim El-Wardany, Gajawalli V. Srinivasan, Joseph J. Sangiovanni, Ranadip Acharya
  • Publication number: 20160214211
    Abstract: A method of forming a metal component having different regions containing different grain sizes and in porosities is by additive manufacturing. The method includes spreading a layer of starting powder on a temperature controlled moveable platform in a heated chamber with atmosphere and temperature control. Selected areas of the powder are melted and solidified with a computer controlled focused energy beam. The cooled platform is then indexed down and the process repeated. The grain size of the melted and solidified region can be controlled by the cooling rate during solidification which, in turn is controlled by the temperature of the chamber and the temperature of the cooled moveable platform.
    Type: Application
    Filed: September 25, 2014
    Publication date: July 28, 2016
    Inventors: Shawn J. Gregg, Alexander Staroselsky, Gajawalli V. Srinivasan
  • Patent number: 8801372
    Abstract: A shroud for a gas turbine engine includes a leading portion having a leading edge and a first set of circumferentially spaced slots at the leading edge that break up the leading portion into circumferentially spaced segments separated by the first set of slots, and a trailing portion adjacent to the leading portion. The trailing portion has a trailing edge.
    Type: Grant
    Filed: November 5, 2012
    Date of Patent: August 12, 2014
    Assignee: United Technologies Corporation
    Inventors: Jun Shi, Kevin E. Green, Shaoluo L. Butler, Gajawalli V. Srinivasan, Glenn N. Levasseur
  • Patent number: 8328505
    Abstract: A shroud suitable for use in combination with an adjacent rotor blade includes a leading portion comprising a first thickness, and a trailing portion adjacent to the leading portion and comprising a second thickness, wherein the second thickness is less than the first thickness so that stiffness in the leading portion is greater than in the trailing portion and radial expansion by thermal growth of the leading portion of the shroud is constrained.
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: December 11, 2012
    Assignee: United Technologies Corporation
    Inventors: Jun Shi, Kevin E. Green, Shaoluo L. Butler, Gajawalli V. Srinivasan, Glenn N. Levasseur
  • Publication number: 20120070276
    Abstract: A shroud suitable for use in combination with an adjacent rotor blade includes a leading portion comprising a first thickness, and a trailing portion adjacent to the leading portion and comprising a second thickness, wherein the second thickness is less than the first thickness so that stiffness in the leading portion is greater than in the trailing portion and radial expansion by thermal growth of the leading portion of the shroud is constrained.
    Type: Application
    Filed: November 30, 2011
    Publication date: March 22, 2012
    Applicant: UNITED TECHNOLOGIES CORPORATION
    Inventors: Jun Shi, Kevin E. Green, Shaoluo L. Butler, Gajawalli V. Srinivasan, Glenn N. Levasseur
  • Patent number: 8092160
    Abstract: A shroud suitable for use in a gas turbine engine exhibits substantially uniform thermal growth.
    Type: Grant
    Filed: November 12, 2009
    Date of Patent: January 10, 2012
    Assignee: United Technologies Corporation
    Inventors: Jun Shi, Kevin E. Green, Shaoluo L. Butler, Gajawalli V. Srinivasan, Glenn N. Levasseur
  • Publication number: 20100170264
    Abstract: A shroud suitable for use in a gas turbine engine exhibits substantially uniform thermal growth.
    Type: Application
    Filed: November 12, 2009
    Publication date: July 8, 2010
    Applicant: UNITED TECHNOLOGIES CORPORATION
    Inventors: Jun Shi, Kevin E. Green, Shaoluo L. Butler, Gajawalli V. Srinivasan, Glenn N. Levasseur
  • Patent number: 7665960
    Abstract: A shroud suitable for use in a gas turbine engine exhibits substantially uniform thermal growth.
    Type: Grant
    Filed: August 10, 2006
    Date of Patent: February 23, 2010
    Assignee: United Technologies Corporation
    Inventors: Jun Shi, Kevin E. Green, Shaoluo L. Butler, Gajawalli V. Srinivasan, Glenn N. Levasseur
  • Publication number: 20090272122
    Abstract: A shroud suitable for use in a gas turbine engine exhibits substantially uniform thermal growth.
    Type: Application
    Filed: August 10, 2006
    Publication date: November 5, 2009
    Applicant: United Technologies Corporation
    Inventors: Jun Shi, Kevin E. Green, Shaoluo L. Butler, Gajawalli V. Srinivasan, Glenn Levasseur
  • Publication number: 20020181866
    Abstract: A method for attaching a getter to a surface includes applying an adhesive to the surface and applying the getter to the adhesive layer so as to bond the getter to the surface.
    Type: Application
    Filed: April 25, 2001
    Publication date: December 5, 2002
    Inventors: Russell A. Crook, Gajawalli V. Srinivasan, Kim E. Womer
  • Patent number: 5945062
    Abstract: The invention includes a process for producing a reaction bonded silicon carbide composite reinforced with coated silicon carbide fibers which is suitable for high temperature applications. The process includes the steps of coating SiC fibers with AlN, BN or TiB.sub.2 ; treating the coated fibers with a mixture of SiC powder, water and a surfactant; preparing a slurry comprising SiC powder and water; infiltrating the coated fibers with the slurry to form a cast; drying the cast to form a green body; and reaction bonding the green body to form a dense SiC fiber reinforced reaction bonded matrix composite.The invention further includes a SiC fiber reinforced SiC composite comprising a reaction bonded SiC matrix, a SiC fiber reinforcement possessing thermal stability at high temperatures and an interface coating on the fibers having chemical and mechanical compatibility with the SiC matrix and with the SiC fibers.
    Type: Grant
    Filed: February 17, 1998
    Date of Patent: August 31, 1999
    Assignee: The Carborundum Company
    Inventors: Stephen Chwastiak, Sai-Kwing Lau, Carl H. McMurtry, Gajawalli V. Srinivasan
  • Patent number: 5817432
    Abstract: The invention includes a process for producing a reaction bonded silicon carbide composite reinforced with coated silicon carbide fibers which is suitable for high temperature applications. The process includes the steps of coating SiC fibers with AlN, BN or TiB.sub.2 ; treating the coated fibers with a mixture of SiC powder, water and a surfactant; preparing a slurry comprising SiC powder and water; infiltrating the coated fibers with the slurry to form a cast; drying the cast to form a green body; and reaction bonding the green body to form a dense SiC fiber reinforced reaction bonded matrix composite.The invention further includes a SiC fiber reinforced SiC composite comprising a reaction bonded SiC matrix, a SiC fiber reinforcement possessing thermal stability at high temperatures and an interface coating on the fibers having chemical and mechanical compatibility with the SiC matrix and with the SiC fibers.
    Type: Grant
    Filed: August 16, 1996
    Date of Patent: October 6, 1998
    Assignee: The Carborundum Company
    Inventors: Stephen Chwastiak, Sai-Kwing Lau, Carl H. McMurtry, Gajawalli V. Srinivasan
  • Patent number: 5643514
    Abstract: The invention includes a process for producing a reaction bonded silicon carbide composite reinforced with coated silicon carbide fibers which is suitable for high temperature applications. The process includes the steps of coating SiC fibers with AlN, BN or TiB.sub.2 ; treating the coated fibers with a mixture of SiC powder, water and a surfactant; preparing a slurry comprising SiC powder and water; infiltrating the coated fibers with the slurry to form a cast; drying the cast to form a green body; and reaction bonding the green body to form a dense SiC fiber reinforced reaction bonded matrix composite.The invention further includes a SiC fiber reinforced SiC composite comprising a reaction bonded SiC matrix, a SiC fiber reinforcement possessing thermal stability at high temperatures and an interface coating on the fibers having chemical and mechanical compatibility with the SiC matrix and with the SiC fibers.
    Type: Grant
    Filed: May 22, 1995
    Date of Patent: July 1, 1997
    Assignee: The Carborundum Company
    Inventors: Stephen Chwastiak, Sai-Kwing Lau, Carl H. McMurtry, Gajawalli V. Srinivasan
  • Patent number: 5296311
    Abstract: The invention provides silicon carbide fiber-reinforced, reaction-bonded silicon carbide composites suitable for high temperature applications in which the silicon carbide fiber is coated with AlN, BN or TiB.sub.2. The composites offer superior fracture toughness which is ascribed to fiber pullout. The invention also includes a process for making the composites.
    Type: Grant
    Filed: March 17, 1992
    Date of Patent: March 22, 1994
    Assignee: The Carborundum Company
    Inventors: Carl H. McMurtry, Sa-Kwing Lau, Gajawalli V. Srinivasan, Stephen Chwastiak