Patents by Inventor Ralph D. Gray, Jr.

Ralph D. Gray, Jr. 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).

  • Solvent assisted process for recovery of phthalic anhydride in the liquid phase by distillation
    Patent number: 5718808
    Abstract: A process for recovering phthalic anhydride as a liquid from a vapor phase oxidation product which comprises mixing the vapor phase oxidation product having a temperature of about 130.degree. C. or greater with a first stream comprising a solvent having a boiling point in the range between about 150.degree. to 350.degree. C. and a freezing point of less than 40.degree. C.
    Type: Grant
    Filed: November 29, 1996
    Date of Patent: February 17, 1998
    Assignee: Exxon Chemical Patents Inc.
    Inventors: James J. Baiel, Larry O. Jones, Ralph D. Gray, Jr., Magdiel Agosto