Granted Patent
Utility
US 5,516,406 · App. 08/356,610
Process for purifying acids formed during liquid phase oxidation of butane
Inventors:
Nicole Wallace, Kenneth A. Windhorst
Patented Case
View Patent ↗
Granted: May 14, 1996
Filed: Dec 15, 1994
Inventors
Nicole Wallace
Kenneth A. Windhorst
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.