Patents by Inventor Richard R. Hepner

Richard R. Hepner 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 the separation of glycols from dimethyl terephthalate
    Patent number: 5391263
    Abstract: Separation of ethylene glycol and diethylene glycol from dimethyl terephthalate is accomplished by distillation using methyl benzoate or the methyl ester of p-toluic acid as an azeotropic agent.
    Type: Grant
    Filed: January 26, 1994
    Date of Patent: February 21, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Richard R. Hepner, Robert E. Michel, Robert E. Trotter