Patents by Inventor Chester W. Sink

Chester W. Sink 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 separating cyclohexane dimethanol from dimethyl terephthalate
    Patent number: 5498749
    Abstract: Provided is a method useful for separating and removing impurities such as cyclohexane dimethanol (CHDM) and other additives from their mixture with dimethylterehthalate (DMT), formed during a depolymerization process such as methanolysis of poly(ethyene terephthalate) (PET), poly(cyclohexyldimethylene terephthalate) (PCT), or copolyers of PET and PCT. The separation and removal of CHDM is accomplished via either melt or solution crystallization of the DMT following excess methanol removal (via distillation) of the methanolysis reactor products.
    Type: Grant
    Filed: October 22, 1993
    Date of Patent: March 12, 1996
    Assignee: Eastman Chemical Company
    Inventors: William H. Heise, Daniel P. Folk, Cheuk C. Yau, Chester W. Sink