Granted Patent
Utility
US 4,870,217 · App. 07/261,818
Method for production of phenol/acetone from cumene hydroperoxide
Inventor:
John F. Knifton
Patented Case
View Patent ↗
Granted: Sep 26, 1989
Filed: Oct 24, 1988
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.