Patents by Inventor Sara Caldwell

Sara Caldwell 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).

  • Polyester with high carboxyl end groups and methods for making
    Publication number: 20050176920
    Abstract: The present invention relates to a polyester or copolyester composition containing a substituted cyclic anhydride, having a carboxyl end group of greater or equal to 25 mmol/kg. The present invention also concerns a method of making such a polyester or copolyester by late injection of the substituted cyclic anhydride at the end of polycondensation, or alternatively adding the substituted cyclic anhydride to the preform injection molding machine, prior to stretch blow molding a container.
    Type: Application
    Filed: February 6, 2004
    Publication date: August 11, 2005
    Inventor: Sara Caldwell