Granted Patent
Utility
US 5,283,355 · App. 07/780,470
Benzoquinone compounds
Inventor:
William J Norris
Patented Case
View Patent ↗
Granted: Feb 1, 1994
Filed: Oct 22, 1991
Inventor
William J Norris
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.