Patents by Inventor Gary E. Wilkins

Gary E. Wilkins 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).

  • Patent number: 5744503
    Abstract: A process for recovering glycols produced during recycling of polyester comprising the step of extracting aromatic contaminants from the glycols. Extracting the aromatic contaminants is accomplished by: providing a glycol rich stream from a process to recycle polyester. The glycol rich stream comprised glycols, water, and aromatic contaminants. A solvent is added to the glycol rich stream to form a mixture. The mixture is resolved to form a glycol rich component and an aromatic contaminant rich component. The glycols are recovered from the glycol rich component.
    Type: Grant
    Filed: February 1, 1996
    Date of Patent: April 28, 1998
    Assignee: Hoechst Celanese Corporation
    Inventors: Brad L. Smith, Gary E. Wilkins
  • Patent number: 5502239
    Abstract: A process for recovering dimethyl terephthalate (DMT) comprises the steps of: providing a dimethyl terephthalate stream including dimethyl terephthalate, glycols, and coordination compounds; acidifying the coordination compounds to disassociate the ligands from the metalions; separating the ligands from the metalions; separating the dimethyl terephthalate from the glycols; and recovering the dimethyl terephthalate. Additionally, the process may include the step of basifying the metalions to precipitate the metal; and recovering the metal.
    Type: Grant
    Filed: August 7, 1995
    Date of Patent: March 26, 1996
    Assignee: Hoechst Celanese Corporation
    Inventors: Brad L. Smith, Gary E. Wilkins
  • Patent number: 5414106
    Abstract: A process for recovering dimethyl terephthalate (DMT) is disclosed. The process includes the steps of: (a) providing a DMT stream, the DMT stream including DMT, catalyst, and ethylene glycol; (b) adding a solvent to the DMT stream, the solvent being immiscible with water and miscible with DMT; (c) adding water to the DMT stream; and (d) forming two phases, a first phase of the solvent and DMT, and a second phase of water, ethylene glycol, and catalyst.
    Type: Grant
    Filed: February 14, 1994
    Date of Patent: May 9, 1995
    Assignee: Hoechst Celanese Corporation
    Inventors: Brad L. Smith, Gary E. Wilkins