Patents by Inventor Pakming HUNG

Pakming HUNG 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).

  • Preparation of recycled polyethylene terephthalate pellets, and bottles formed therefrom
    Patent number: 12552911
    Abstract: A method for recycling polyethylene terephthalate, including obtaining flakes of polyethylene terephthalate which are re-polymerized using heat and/or a chain extender combined with an anti-yellowing agent to yield an average molecular weight of at least 40,000 Da and a tunable intrinsic viscosity of approximately 0.5 dl/g to 0.8 dl/g. Polyethylene terephthalate pellets are produced having a color deviation of approximately 2.5 or less from the re-polymerized 100 percent post-consumer polyethylene terephthalate flakes as raw material for formation of polyethylene terephthalate products. When compared to available rPET bottles, CIELAB color values show indiscernible color differences with the high quality rPET produced. Consequently, the high-quality rPET pellets produced are capable manufacturing PET bottles with 100% PCR content and a high number of repeated recycling cycles.
    Type: Grant
    Filed: October 13, 2022
    Date of Patent: February 17, 2026
    Assignee: Nano and Advanced Materials Institute Limited
    Inventors: Xianqiao Liu, Wei Kong, Suqing Tan, Pakming Hung
  • PREPARATION OF RECYCLED POLYETHYLENE TEREPHTHALATE PELLETS, AND BOTTLES FORMED THEREFROM
    Publication number: 20240141133
    Abstract: A method for recycling polyethylene terephthalate, including obtaining flakes of polyethylene terephthalate which are re-polymerized using heat and/or a chain extender combined with an anti-yellowing agent to yield an average molecular weight of at least 40,000 Da and a tunable intrinsic viscosity of approximately 0.5 dl/g to 0.8 dl/g. Polyethylene terephthalate pellets are produced having a color deviation of approximately 2.5 or less from the re-polymerized 100 percent post-consumer polyethylene terephthalate flakes as raw material for formation of polyethylene terephthalate products. When compared to available rPET bottles, CIELAB color values show indiscernible color differences with the high quality rPET produced. Consequently, the high-quality rPET pellets produced are capable manufacturing PET bottles with 100% PCR content and a high number of repeated recycling cycles.
    Type: Application
    Filed: October 13, 2022
    Publication date: May 2, 2024
    Inventors: Xianqiao LIU, Wei KONG, Suqing TAN, Pakming HUNG