Patents by Inventor Kathleen Kiibler

Kathleen Kiibler 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).

  • Process for increasing the toughness of solid state polymerized poly (trimethylene terephthalate) pellets
    Publication number: 20050075479
    Abstract: This invention is a process for increasing the toughness of solid state polymerized (SSP) poly(trimethylene terephthalate) (PTT) pellets which have an intrinsic viscosity of about 0.7 dl/g or greater prior to extrusion. The process comprises extruding the PTT SSP pellets at a temperature of about 245 to about 280° C for from about 1 minute to about 20 minutes, cutting the PTT into pellets, and crystallizing the PTT pellets to about 10 to about 45 percent crystallinity.
    Type: Application
    Filed: October 1, 2004
    Publication date: April 7, 2005
    Inventors: Robert Blackbourn, Houston Brown, Donald Kelsey, Kathleen Kiibler, Wen-Tzung Tang