Granted Patent
Utility
US 4,876,397 · App. 07/261,819
Method for production of phenol/acetone from cumene hydroperoxide
Inventors:
John F. Knifton, Neal J. Grice
Patented Case
View Patent ↗
Granted: Oct 24, 1989
Filed: Oct 24, 1988
Inventors
John F. Knifton
Neal J. Grice
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.