Patents by Inventor Buddhadev Chakrabarti

Buddhadev Chakrabarti 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).

  • Composite structure having ceramic truss core and method for making the same
    Patent number: 9782951
    Abstract: A CMC sandwich used to fabricate CMC structures includes facesheets bonded to a core reinforced with a ceramic truss comprising an array of CMC pins. The binder matrix in the ends of the pins is removed, leaving exposed, flexible ceramic fibers. The exposed ceramic fibers are bent so as to extend parallel to the facesheets, and are bonded to one or more plies of the facesheets. The binder matrix in the ends of the ceramic pins may be removed by mechanical or chemical processes.
    Type: Grant
    Filed: July 18, 2007
    Date of Patent: October 10, 2017
    Assignee: THE BOEING COMPANY
    Inventors: William P. Keith, Buddhadev Chakrabarti, Leanne Lehman
  • Method for making hybrid metal-ceramic matrix composite structures and structures made thereby
    Patent number: 8715439
    Abstract: A laminated ceramic matrix composite structure is strengthened with one or more layers of a metal reinforcement. The metal reinforcement is selected to provide optimal strength and thermal compatibility with the ceramic matrix composite. The metal reinforcement includes an outer oxidized layer that bonds to the ceramic matrix composite. It may also include a barrier layer on the surface of the metal that helps prevent further oxidation. The structure is formed using standard composite prepreg layup techniques.
    Type: Grant
    Filed: March 7, 2008
    Date of Patent: May 6, 2014
    Assignee: The Boeing Company
    Inventors: Buddhadev Chakrabarti, Leanne Lehman, Ali Yousefiani, William P. Keith
  • Composite structure having reinforced core and method of making the same
    Patent number: 8642168
    Abstract: A polymer-based composite sandwich includes a reinforced core bonded between a pair of composite facesheets. The core includes a truss formed by groups of composite pins held in place by a layer of structural foam. The pins in the groups are radially arranged around nodes. The ends of the pins are splayed and sandwiched between the foam layer and the facesheets.
    Type: Grant
    Filed: April 19, 2013
    Date of Patent: February 4, 2014
    Assignee: The Boeing Company
    Inventor: Buddhadev Chakrabarti
  • Composite Structure and Method of Making the Same
    Publication number: 20130230690
    Abstract: A polymer-based composite sandwich includes a reinforced core bonded between a pair of composite facesheets. The core includes a truss formed by groups of composite pins held in place by a layer of structural foam. The pins in the groups are radially arranged around nodes. The ends of the pins are splayed and sandwiched between the foam layer and the facesheets.
    Type: Application
    Filed: April 19, 2013
    Publication date: September 5, 2013
    Applicant: The Boeing Company
    Inventor: Buddhadev Chakrabarti
  • Composite structure having reinforced core
    Patent number: 8512853
    Abstract: A polymer-based composite sandwich includes a core bonded between fiber reinforced resin facesheets. The core includes a truss formed by groups of composite pins held in a low density foam. The pins in each group intersect to form nodes adjacent to one of the facesheets. The ends of the pins extend parallel and are bonded to the facesheets.
    Type: Grant
    Filed: July 31, 2007
    Date of Patent: August 20, 2013
    Assignee: The Boeing Company
    Inventor: Buddhadev Chakrabarti
  • Composite structure having reinforced core and method of making same
    Patent number: 8431214
    Abstract: A polymer-based composite sandwich includes a reinforced core bonded between a pair of composite facesheets. The core includes a truss formed by groups of composite pins held in place by a layer of structural foam. The pins in the groups are radially arranged around nodes. The ends of the pins are splayed and sandwiched between the foam layer and the facesheets.
    Type: Grant
    Filed: February 15, 2010
    Date of Patent: April 30, 2013
    Assignee: The Boeing Company
    Inventor: Buddhadev Chakrabarti
  • Exhaust washed structure and associated composite structure and method of fabrication
    Patent number: 8192570
    Abstract: A composite structure and an associated exhaust washed structure are provided which may be formed of ceramic matrix composite (CMC) materials. A method of fabricating a composite structure which may include the CMC material is also provided. A composite structure may include a corrugated septum extending in a lengthwise direction. The composite structure may also include a flute within which the corrugated septum is disposed to form, for example, a partitioned flute assembly.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: June 5, 2012
    Assignee: The Boeing Company
    Inventors: Michael L. Hand, Buddhadev Chakrabarti, Leanne L. Lehman, Gopal P. Mathur
  • EXHAUST WASHED STRUCTURE AND ASSOCIATED COMPOSITE STRUCTURE AND METHOD OF FABRICATION
    Publication number: 20120066882
    Abstract: A composite structure and an associated exhaust washed structure are provided which may be formed of ceramic matrix composite (CMC) materials. A method of fabricating a composite structure which may include the CMC material is also provided. A composite structure may include a corrugated septum extending in a lengthwise direction. The composite structure may also include a flute within which the corrugated septum is disposed to form, for example, a partitioned flute assembly.
    Type: Application
    Filed: September 23, 2011
    Publication date: March 22, 2012
    Applicant: THE BOEING COMPANY
    Inventors: Michael L. Hand, Buddhadev Chakrabarti, Leanne L. Lehman, Gopal P. Mathur
  • Exhaust washed structure and associated composite structure and method of fabrication
    Patent number: 8043690
    Abstract: A composite structure and an associated exhaust washed structure are provided which may be formed of ceramic matrix composite (CMC) materials. A method of fabricating a composite structure which may include the CMC material is also provided. A composite structure may include a corrugated septum extending in a lengthwise direction. The composite structure may also include a flute within which the corrugated septum is disposed to form, for example, a partitioned flute assembly.
    Type: Grant
    Filed: April 21, 2008
    Date of Patent: October 25, 2011
    Assignee: The Boeing Company
    Inventors: Michael L. Hand, Buddhadev Chakrabarti, Leanne L. Lehman, Gopal P. Mathur
  • Composite Structure Having Reinforced Core and Method of Making Same
    Publication number: 20100151189
    Abstract: A polymer-based composite sandwich includes a reinforced core bonded between a pair of composite facesheets. The core includes a truss formed by groups of composite pins held in place by a layer of structural foam. The pins in the groups are radially arranged around nodes. The ends of the pins are splayed and sandwiched between the foam layer and the facesheets.
    Type: Application
    Filed: February 15, 2010
    Publication date: June 17, 2010
    Inventor: Buddhadev Chakrabarti
  • Exhaust Washed Structure And Associated Composite Structure And Method Of Fabrication
    Publication number: 20090263627
    Abstract: A composite structure and an associated exhaust washed structure are provided which may be formed of ceramic matrix composite (CMC) materials. A method of fabricating a composite structure which may include the CMC material is also provided. A composite structure may include a corrugated septum extending in a lengthwise direction. The composite structure may also include a flute within which the corrugated septum is disposed to form, for example, a partitioned flute assembly.
    Type: Application
    Filed: April 21, 2008
    Publication date: October 22, 2009
    Applicant: The Boeing Company
    Inventors: Michael L. Hand, Buddhadev Chakrabarti, Leanne L. Lehman, Gopal P. Mathur
  • Method for Making Hybrid Metal-Ceramic Matrix Composite Structures and Structures Made Thereby
    Publication number: 20090226746
    Abstract: A laminated ceramic matrix composite structure is strengthened with one or more layers of a metal reinforcement. The metal reinforcement is selected to provide optimal strength and thermal compatibility with the ceramic matrix composite. The metal reinforcement includes an outer oxidized layer that bonds to the ceramic matrix composite. It may also include a barrier layer on the surface of the metal that helps prevent further oxidation. The structure is formed using standard composite prepreg layup techniques.
    Type: Application
    Filed: March 7, 2008
    Publication date: September 10, 2009
    Inventors: Buddhadev Chakrabarti, Leanne Lehman, Ali Yousefiani, William P. Keith
  • COMPOSITE STRUCTURE HAVING REINFORCED CORE AND METHOD OF MAKING SAME
    Publication number: 20090035510
    Abstract: A polymer-based composite sandwich includes a core bonded between fiber reinforced resin facesheets. The core includes a truss formed by groups of composite pins held in a low density foam. The pins in each group intersect to form nodes adjacent to one of the facesheets. The ends of the pins extend parallel and are bonded to the facesheets.
    Type: Application
    Filed: July 31, 2007
    Publication date: February 5, 2009
    Inventor: Buddhadev Chakrabarti
  • Composite Structure having Ceramic Truss Core and Method for Making the Same
    Publication number: 20090019685
    Abstract: A CMC sandwich used to fabricate CMC structures includes facesheets bonded to a core reinforced with a ceramic truss comprising an array of CMC pins. The binder matrix in the ends of the pins is removed, leaving exposed, flexible ceramic fibers. The exposed ceramic fibers are bent so as to extend parallel to the facesheets, and are bonded to one or more plies of the facesheets. The binder matrix in the ends of the ceramic pins may be removed by mechanical or chemical processes.
    Type: Application
    Filed: July 18, 2007
    Publication date: January 22, 2009
    Inventors: William P. Keith, Buddhadev Chakrabarti, Leanne Lehman
  • Method for an integral composite forward flange in a composite
    Patent number: 7338694
    Abstract: The present invention is directed toward a laminate composite structure and a method for fabricating a laminate composite structure, wherein the laminate composite structure comprises a solid laminate and a composite sandwich structure. The solid laminate includes a bend having composite pins inserted there through. The composite sandwich structure is comprised of a core material sandwiched between top and bottom composite face sheets.
    Type: Grant
    Filed: May 21, 2007
    Date of Patent: March 4, 2008
    Assignee: The Boeing Company
    Inventors: William Preston Keith, Joshua Andrew Chua, Buddhadev Chakrabarti
  • METHOD FOR AN INTEGRAL COMPOSITE FORWARD FLANGE IN A COMPOSITE
    Publication number: 20070207300
    Abstract: The present invention is directed toward a laminate composite structure and a method for fabricating a laminate composite structure, wherein the laminate composite structure comprises a solid laminate and a composite sandwich structure. The solid laminate includes a bend having composite pins inserted there through. The composite sandwich structure is comprised of a core material sandwiched between top and bottom composite face sheets.
    Type: Application
    Filed: May 21, 2007
    Publication date: September 6, 2007
    Inventors: William Keith, Joshua Chua, Buddhadev Chakrabarti
  • Method for an integral composite forward flange in a composite
    Patent number: 7229513
    Abstract: The present invention is directed toward a laminate composite structure and a method for fabricating a laminate composite structure, wherein the laminate composite structure comprises a solid laminate and a composite sandwich structure. The solid laminate includes a bend having composite pins inserted there through. The composite sandwich structure is comprised of a core material sandwiched between top and bottom composite face sheets.
    Type: Grant
    Filed: October 31, 2003
    Date of Patent: June 12, 2007
    Assignee: The Boeing Company
    Inventors: William Preston Keith, Joshua Andrew Chua, Buddhadev Chakrabarti
  • Method for an integral composite forward flange in a composite
    Publication number: 20050095394
    Abstract: The present invention is directed toward a laminate composite structure and a method for fabricating a laminate composite structure, wherein the laminate composite structure comprises a solid laminate and a composite sandwich structure. The solid laminate includes a bend having composite pins inserted there through. The composite sandwich structure is comprised of a core material sandwiched between top and bottom composite face sheets.
    Type: Application
    Filed: October 31, 2003
    Publication date: May 5, 2005
    Inventors: William Keith, Joshua Chua, Buddhadev Chakrabarti