Granted Patent
Utility
US 5,206,434 · App. 07/615,939
Purification process for methyl acetate
Inventors:
Mark O. Scates, Russell K. Gibbs, Jr., G. Paull Torrence
Patented Case
View Patent ↗
Granted: Apr 27, 1993
Filed: Nov 19, 1990
Inventors
Mark O. Scates
Russell K. Gibbs, Jr.
G. Paull Torrence
Assignee (at issue)
Hoechst Celanese Corporation
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.