Patents by Inventor Thomas M. Wardlow

Thomas M. Wardlow 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).

  • Polycarbonate having reduced carbonate byproduct content
    Patent number: 5362839
    Abstract: A process for preparing polycarbonate wherein a chain terminator is added to the reaction mixture after substantial reaction of a carbonate precursor, a coupling catalyst is added to the reaction mixture after substantial reaction of the chain terminator, and base is added to the reaction mixture after reaction mixture after substantial reaction of the chain terminatorin an amount sufficient to give a negative chloroformate test.
    Type: Grant
    Filed: February 16, 1994
    Date of Patent: November 8, 1994
    Assignee: The Dow Chemical Company
    Inventors: Sarat Munjal, Thomas M. Wardlow, Andrew F. Hall
  • Preparation of polycarbonate with subsequent addition of chain terminator and base
    Patent number: 5288837
    Abstract: A process for preparing polycarbonate wherein a chain terminator is added to the reaction mixture after substantial reaction of a carbonate precursor, a coupling catalyst is added to the reaction mixture after substantial reaction of the chain terminator, and base is added to the reaction mixture after reaction mixture after substantial reaction of the chain terminator in an amount sufficient to give a negative chloroformate test.
    Type: Grant
    Filed: April 5, 1993
    Date of Patent: February 22, 1994
    Assignee: The Dow Chemical Company
    Inventors: Sarat Munjal, Thomas M. Wardlow, Andrew F. Hall
  • Process for preparing polycarbonate having reduced carbonate byproduct content
    Patent number: 5200496
    Abstract: A process for preparing polycarbonate wherein a chain terminator is added to the reaction mixture after substantial reaction of a carbonate precursor, a coupling catalyst is added to the reaction mixture after substantial reaction of the chain terminator, and base is added to the reaction mixture after reaction mixture after substantial reaction of the chain terminator in an amount sufficient to give a negative chloroformate test.
    Type: Grant
    Filed: July 2, 1991
    Date of Patent: April 6, 1993
    Assignee: The Dow Chemical Company
    Inventors: Sarat Munjal, Thomas M. Wardlow, Andrew F. Hall