Patents by Inventor Jon Bruce Mansfield

Jon Bruce Mansfield 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 controlling the manufacture of polycarbonate and the polycarbonate formed thereby
    Patent number: 6646096
    Abstract: A method for determining the endpoint of an interfacial reaction between a dihydroxy compound and a carbonyl halide comprises determining the characteristic end point of the reaction from a characteristic pH trace over time or ratio between caustic and carbonyl halide trace over time for the reaction; obtaining a pH trace over time or a ratio between caustic and carbonyl halide trace over time during the reaction to be monitored; and identifying the end point of the monitored reaction when the obtained pH or ratio trace resembles the end point determined from the characteristic pH or ratio trace.
    Type: Grant
    Filed: November 8, 2001
    Date of Patent: November 11, 2003
    Assignee: General Electric Company
    Inventors: Gregory Lee Hemmer, Jon Bruce Mansfield
  • Method for controlling the manufacture of polycarbonate and the polycarbonate formed thereby
    Publication number: 20020111455
    Abstract: A method for determining the endpoint of an interfacial reaction between a dihydroxy compound and a carbonyl halide comprises determining the characteristic end point of the reaction from a characteristic pH trace over time or ratio between caustic and carbonyl halide trace over time for the reaction; obtaining a pH trace over time or a ratio between caustic and carbonyl halide trace over time during the reaction to be monitored; and identifying the end point of the monitored reaction when the obtained pH or ratio trace resembles the end point determined from the characteristic pH or ratio trace.
    Type: Application
    Filed: November 8, 2001
    Publication date: August 15, 2002
    Inventors: Gregory Lee Hemmer, Jon Bruce Mansfield