Patents by Inventor Godavarthi Satyanaryana Varadarajan

Godavarthi Satyanaryana Varadarajan 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 of preparing polycarbonates by solid state polymerization
    Patent number: 5905135
    Abstract: Crystallization of precursor polycarbonates prior to solid state polymerization is achieved by contact with a non-solvent comprising, at least in part, a dialkyl carbonate such as dimethyl carbonate. The non-solvent can be a mixture, typically of dimethyl carbonate with water or an alkanol such as methanol.
    Type: Grant
    Filed: December 8, 1997
    Date of Patent: May 18, 1999
    Assignee: General Electric Company
    Inventors: Bhaskar Bhairavnath Idage, Swaminathan Sivaram, Godavarthi Satyanaryana Varadarajan, Joseph Anthony King, Jr.