Patents by Inventor Asim Tewari

Asim Tewari 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).

  • Method for in-situ foaming of metal foam in hollow structure
    Publication number: 20080092390
    Abstract: A method is provided for filling a hollow structure with metal foam. A mixture is made of a metal powder and a foaming agent. An electric resistance heating wire is provided and the mixture is consolidated into a solid preformed charge with the wire embedded in the charge and extending from the ends thereof. The preformed charge is placed into the hollow structure and electric current is applied to the resistance heating wire so that the metal powder is melted and the foaming agent foams the melted metal to fill the hollow structure.
    Type: Application
    Filed: October 19, 2006
    Publication date: April 24, 2008
    Applicant: GM Global Technology Operations, Inc.
    Inventors: Asim Tewari, Anil K. Sachdev, Srinivas Subbarao
  • Piston ring assembly including a self accommodating smart piston ring
    Publication number: 20080042368
    Abstract: A piston ring assembly includes a piston ring formed of a shape memory alloy. By using a shape memory alloy material, the piston ring changes its shape during exposure to transient thermal conditions so as to minimize engine wear. The shape memory alloy composition of the piston ring is selected to exhibit a martensite phase during cold start operating conditions and as the temperature increases changes to the austenite phase so as to recover its original shape.
    Type: Application
    Filed: August 7, 2006
    Publication date: February 21, 2008
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventor: Asim Tewari