Patents by Inventor David Patrick Phelon

David Patrick Phelon 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).

  • Use of a residual oligomer recyclate in the production of macrocyclic polyester oligomer
    Patent number: 7750109
    Abstract: The invention relates to methods and systems for the use of an oligomer recyclate from a depolymerization product stream. The oligomer byproduct of a polyester depolymerization reaction can be used as a reactant in the formation of a polyester. For example, linear oligomer byproduct can be used as a reactant in a solution polymerization to form a low-acid polyalkylene terephthalate.
    Type: Grant
    Filed: March 24, 2006
    Date of Patent: July 6, 2010
    Assignee: Cyclics Corporation
    Inventors: Peter D. Phelps, Jimmy Lynn Webb, David Patrick Phelon, Paul M. Andrusyszyn, Gary R. Faler
  • Methods for removing catalyst residue from a depolymerization process stream
    Patent number: 7732557
    Abstract: The invention relates to methods and systems for selective removal of catalyst residue from a depolymerization product stream without a water quench, as well as methods and systems for subsequent recovery of residual linear oligomer. The substantially metal-free and substantially water-free residual oligomer byproduct can then be advantageously used as recyclate in a process for preparing MPO. For example, the residual oligomer recyclate can be used as a reactant in the polymerization and subsequent depolymerization (cyclization) of low-acid polyester to form MPO.
    Type: Grant
    Filed: March 24, 2006
    Date of Patent: June 8, 2010
    Assignee: Cyclics Corporation
    Inventors: Peter D. Phelps, Jimmy Lynn Webb, David Patrick Phelon, Paul M. Andrusyszyn