Granted Patent
Utility
US 4,898,995 · App. 07/261,817
Method for production of phenol/acetone from cumene hydroperoxide
Inventors:
John F. Knifton, John R. Sanderson
Patented Case
View Patent ↗
Granted: Feb 6, 1990
Filed: Oct 24, 1988
Inventors
John F. Knifton
John R. Sanderson
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.