Patents by Inventor K. Sharvan Kumar

K. Sharvan Kumar 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).

  • Aluminum-lithium alloys
    Patent number: 5431876
    Abstract: A group of ternary alloys of aluminum-lithium and magnesium or copper further including at least one additive element such as zirconium, chromium and/or manganese. These alloys have an improved combination of properties such as strength, ductility and weldability and in some cases improved tensile properties at cryogenic temperatures.
    Type: Grant
    Filed: April 26, 1994
    Date of Patent: July 11, 1995
    Assignee: Comalco Aluminium Ltd.
    Inventors: K. Sharvan Kumar, Joseph R. Pickens
  • Ultra high strength weldable aluminum-lithium alloys
    Patent number: 5032359
    Abstract: A family of alloys based upon aluminum-copper-magnesium-silver alloys to which lithium has been added, within specified ranges, exhibits superior ambient- and elevated-temperature strength, superior ductility at ambient and elevated temperatures, extrudability, forgeability, weldability, and an unexpected natural aging response.
    Type: Grant
    Filed: March 23, 1989
    Date of Patent: July 16, 1991
    Assignee: Martin Marietta Corporation
    Inventors: Joseph R. Pickens, Frank H. Heubaum, Lawrence S. Kramer, K. Sharvan Kumar
  • Multicomponent, low density cubic L1.sub.2 aluminides
    Patent number: 4865666
    Abstract: Intermetallics capable of use as structural elements, exhibiting relatively high ductility and low brittleness, comprise ternary and quaternary TiAl.sub.3 alloys of the general formulae Al--Ti--M and Al--Ti--M--M', wherein M is selected from Cu, Ni, and Fe, M' is selected from V, Nb, and Ta. Such materials exhibit cubic, Ll.sub.2 crystal structures.
    Type: Grant
    Filed: October 14, 1987
    Date of Patent: September 12, 1989
    Assignee: Martin Marietta Corporation
    Inventors: K. Sharvan Kumar, Walter Precht
  • In situ process for producing a composite containing refractory material
    Patent number: 4808372
    Abstract: An in situ process is provided for producing a composite comprising a refractory material dispersed in a solid matrix. A molten composition comprising a matrix liquid, and at least one refractory carbide-forming component are provided, and a gas is introduced into the molten composition. A reactive component is also provided for reaction with the refractory material-forming component. The refractory material-forming component and reactive component react to form a refractory material dispersed in the matrix liquid, and the liquid composite is cooled to form a solid composite material. In one embodiment, the reactive component is a carbonaceous component in the form of a component of the gas, a solid in the gas or the molten composition, or both. The carbonaceous component is provided for reaction with a refractory carbide-forming component to yield a refractory carbide. In a preferred embodiment, the matrix liquid is molten aluminum and the refractory carbide-forming component is tantalum.
    Type: Grant
    Filed: January 23, 1986
    Date of Patent: February 28, 1989
    Assignee: Drexel University
    Inventors: Michael J. Koczak, K. Sharvan Kumar