Granted Patent
Utility
US 5,980,696 · App. 08/776,979
Dehydration of acetic acid by azeotropic distillation in the production of an aromatic acid
Inventors:
William D. Parten, Alan Macpherson Ure
Patented Case
View Patent ↗
Granted: Nov 9, 1999
Filed: Feb 5, 1997
Inventors
William D. Parten
Alan Macpherson Ure
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.