Patents by Inventor Rajiv S. Mishra

Rajiv S. Mishra 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: 10766071
    Abstract: Novel metallic systems and methods for their fabrication provide an extreme creep-resistant nano-crystalline metallic material. The material comprises a matrix formed of a solvent metal with crystalline grains having diameters of no more than about 500 nm, and a plurality of dispersed metallic particles formed on the basis of a solute metal in the solvent metal matrix and having diameters of no more than about 200 nm. The particle density along the grain boundary of the matrix is as high as about 2 nm2 of grain boundary area per particle so as to substantially block grain boundary motion and rotation and limit creep at temperatures above 35% of the melting point of the material.
    Type: Grant
    Filed: February 14, 2018
    Date of Patent: September 8, 2020
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Laszlo J. Kecskes, Kristopher A. Darling, Rajiv S. Mishra, Yuri Mishin, Kiran N. Solanki, Mansa Rajagopalan
  • Publication number: 20180229308
    Abstract: Novel metallic systems and methods for their fabrication provide an extreme creep-resistant nano-crystalline metallic material. The material comprises a matrix formed of a solvent metal with crystalline grains having diameters of no more than about 500 nm, and a plurality of dispersed metallic particles formed on the basis of a solute metal in the solvent metal matrix and having diameters of no more than about 200 nm. The particle density along the grain boundary of the matrix is as high as about 2 nm2 of grain boundary area per particle so as to substantially block grain boundary motion and rotation and limit creep at temperatures above 35% of the melting point of the material.
    Type: Application
    Filed: February 14, 2018
    Publication date: August 16, 2018
    Inventors: Laszlo J. Kecskes, Kristopher A. Darling, Rajiv S. Mishra, Yuri Mishin, Kiran N. Solanki, Mansa Rajagopalan
  • Publication number: 20110204122
    Abstract: A hollow structure, and a method of forming the hollow structure, where the hollow structure includes first and second metal parts, the second metal part having an interior surface and a tapered support member extending from the interior surface. The hollow structure also includes a friction stir welded joint that extends through the first metal part and into the tapered support member.
    Type: Application
    Filed: May 5, 2011
    Publication date: August 25, 2011
    Applicants: UNITED TECHNOLOGIES CORPORATION, THE CURATORS OF THE UNIVERSITY OF MISSOURI
    Inventors: Thomas J. Watson, Rajiv S. Mishra
  • Publication number: 20100068550
    Abstract: A hollow structure, and a method of forming the hollow structure, where the hollow structure includes first and second metal parts, the second metal part having an interior surface and a tapered support member extending from the interior surface. The hollow structure also includes a friction stir welded joint that extends through the first metal part and into the tapered support member.
    Type: Application
    Filed: November 23, 2009
    Publication date: March 18, 2010
    Applicants: UNITED TECHNOLOGIES CORPORATION, THE CURATORS OF THE UNIVERSITY OF MISSOURI
    Inventors: Thomas J. Watson, Rajiv S. Mishra
  • Publication number: 20080308197
    Abstract: A method for processing a metal part includes extruding an Al-RE-TM alloy to form an extruded part, heating the extruded part, and applying a compressive strain greater than about 50% on the heated part.
    Type: Application
    Filed: June 15, 2007
    Publication date: December 18, 2008
    Applicants: United Technologies Corporation, The Curators of the University of Missouri
    Inventors: Thomas J. Watson, Rajiv S. Mishra, Yanwen Wang
  • Publication number: 20080311421
    Abstract: A welded structure that includes first and second metal parts derived from Al-RE-TM alloys, which are secured together at a welded joint by friction stir welding.
    Type: Application
    Filed: June 15, 2007
    Publication date: December 18, 2008
    Applicants: United Technologies Corporation, The Curators of the University of Missouri
    Inventors: Thomas J. Watson, Rajiv S. Mishra
  • Publication number: 20080308610
    Abstract: A hollow structure, and a method of forming the hollow structure, where the hollow structure includes first and second metal parts, the second metal part having an interior surface and a tapered support member extending from the interior surface. The hollow structure also includes a friction stir welded joint that extends through the first metal part and into the tapered support member.
    Type: Application
    Filed: June 15, 2007
    Publication date: December 18, 2008
    Applicants: United Technologies Corporation, The Curators of the University of Missouri
    Inventors: Thomas J. Watson, Rajiv S. Mishra
  • Patent number: 7354657
    Abstract: An internal channel in a metal body for use in applications where internal fluid flow within a metal body is desired, as in a heat exchanger. The internal channel is formed in the metal body by frictionally stirring with a pin plunged into the metal body, and traversing the metal body with the pin.
    Type: Grant
    Filed: June 28, 2005
    Date of Patent: April 8, 2008
    Assignee: The Curators of University of Missouri
    Inventor: Rajiv S. Mishra
  • Patent number: 6923362
    Abstract: An internal channel in a metal body for use in applications where internal fluid flow within a metal body is desired, as in a heat exchanger. The internal channel is formed in the metal body by frictionally stirring with a pin plunged into the metal body, and traversing the metal body with the pin.
    Type: Grant
    Filed: September 30, 2002
    Date of Patent: August 2, 2005
    Assignee: The Curators of University of Missouri
    Inventor: Rajiv S. Mishra
  • Publication number: 20040060965
    Abstract: An internal channel in a metal body for use in applications where internal fluid flow within a metal body is desired, as in a heat exchanger. The internal channel is formed in the metal body by frictionally stirring with a pin plunged into the metal body, and traversing the metal body with the pin.
    Type: Application
    Filed: September 30, 2002
    Publication date: April 1, 2004
    Inventor: Rajiv S. Mishra
  • Patent number: 6712916
    Abstract: A shaped metallic component is formed by friction stirring at least a segment of a single piece of bulk metal to impart superplasticity thereto and thereby yield a single superplastic metal blank from the single piece of bulk metal. The metal blank is then deformed by a metal deformation process such as forging, rolling, drawing, bending, extruding, gas forming, punching, and stamping.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: March 30, 2004
    Assignees: The Curators of the University of Missouri
    Inventors: Rajiv S. Mishra, Murray W. Mahoney
  • Patent number: 6655575
    Abstract: A method for forming a miniaturized shaped component. Bulk superplastic material is contacted with a flat rotating surface of a rotating tool to frictionally heat the bulk superplastic material with the bulk superplastic material positioned between the flat rotating surface of the tool and a microfabricated tool die. The bulk superplastic material is forced into the microfabricated die once the bulk superplastic material is heated to a temperature between a glass transition temperature and a crystallization temperature.
    Type: Grant
    Filed: April 16, 2002
    Date of Patent: December 2, 2003
    Assignee: The Curators of University of Missouri
    Inventor: Rajiv S. Mishra
  • Publication number: 20030192939
    Abstract: A method for forming a miniaturized shaped component. Bulk superplastic material is contacted with a flat rotating surface of a rotating tool to frictionally heat the bulk superplastic material with the bulk superplastic material positioned between the flat rotating surface of the tool and a microfabricated tool die. The bulk superplastic material is forced into the microfabricated die once the bulk superplastic material is heated to a temperature between a glass transition temperature and a crystallization temperature.
    Type: Application
    Filed: April 16, 2002
    Publication date: October 16, 2003
    Inventor: Rajiv S. Mishra
  • Publication number: 20020079351
    Abstract: A shaped metallic component is formed by friction stirring at least a segment of a single piece of bulk metal to impart superplasticity thereto and thereby yield a single superplastic metal blank from the single piece of bulk metal. The metal blank is then deformed by a metal deformation process such as forging, rolling, drawing, bending, extruding, gas forming, punching, and stamping.
    Type: Application
    Filed: December 21, 2001
    Publication date: June 27, 2002
    Inventors: Rajiv S. Mishra, Murray W. Mahoney
  • Patent number: 5728637
    Abstract: Alumina composites of unusually high hardness and toughness are formed by combining alumina and diamond in nanocrystalline form, followed by sintering at high pressure.
    Type: Grant
    Filed: February 1, 1996
    Date of Patent: March 17, 1998
    Assignee: The Regents of the University of California
    Inventors: Rajiv S. Mishra, Amiya K. Mukherjee, Charles E. Lesher