Granted Patent
Utility
US 5,691,267 · App. 08/696,413
Two step gold addition method for preparing a vinyl acetate catalyst
Inventors:
Ioan Nicolau, Azael T. Flores
Patented Case
View Patent ↗
Granted: Nov 25, 1997
Filed: Aug 13, 1996
Inventors
Ioan Nicolau
Azael T. Flores
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.