Patents by Inventor Damon Brian Shackelford

Damon Brian Shackelford 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 recycling polyesters
    Patent number: 6472557
    Abstract: A process for producing high quality TPA suitable for PET feedstock material from recycled polyester. The process includes the steps of depolymerizing the polyester to form DMT; separating the DMT from secondary materials; and hydrolyzing the DMT to form TPA. In a preferred embodiment of the invention the recycled polyester is contacted with a component monomer or oligomer thereof to liquefy the polyester prior to depolymerizing the polyester.
    Type: Grant
    Filed: November 12, 1999
    Date of Patent: October 29, 2002
    Assignee: Eastman Chemical Company
    Inventors: Thomas Michael Pell, Jr., Michael Paul Ekart, David Dunlap Cornell, Damon Brian Shackelford, Donald Lee Carver