Patents by Inventor John L. Maxam

John L. Maxam 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 extruder devolatilization of spiro(bis)indane polycarbonates
    Patent number: 4980105
    Abstract: Spiro(bis)indane polycarbonates, including homo- and copolycarbonates, are devolatilized by extrusion under conditions of low viscous dissipation and low residence time. By this method, volatile impurities including spiro(bis)indane cyclic dimer may be removed.
    Type: Grant
    Filed: August 28, 1989
    Date of Patent: December 25, 1990
    Assignee: General Electric Company
    Inventors: Lawrence R. Schmidt, Joel M. Caraher, John L. Maxam