Granted Patent
Utility
US 5,081,318 · App. 07/663,527
One step synthesis of methyl t-butyl ether from t-butanol using fluorosulfonic acid-modified zeolite catalysts
Inventor:
John F. Knifton
Patented Case
View Patent ↗
Granted: Jan 14, 1992
Filed: Mar 4, 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.