Granted Patent
Utility
US 5,157,161 · App. 07/803,834
One-step synthesis of methyl t-butyl ether from t-butanol using hydrogen fluoride-modified montmorillonite clays
Inventor:
John F. Knifton
Patented Case
View Patent ↗
Granted: Oct 20, 1992
Filed: Dec 9, 1991
Inventor
John F. Knifton
Assignee (at issue)
Texaco Chemical Inc.
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.