Granted Patent
Utility
US 5,202,498 · App. 07/874,957
Inhibiting color change in cumene hydroperoxide
Inventor:
Carole L. Elias
Patented Case
View Patent ↗
Granted: Apr 13, 1993
Filed: Apr 20, 1992
Inventor
Carole L. Elias
Assignee (at issue)
Aristech Chemical Company
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.