Patents by Inventor Srinivas Subbarao

Srinivas Subbarao 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
    Patent number: 7774925
    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: Grant
    Filed: October 19, 2006
    Date of Patent: August 17, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Asim Tewari, Anil K. Sachdev, Srinivas Subbarao
  • 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