Granted Patent
Utility
US 6,024,839 · App. 08/965,661
Hydroquinone to inhibit fouling of epichlorohydrin equipment
Inventor:
Duane Mark Schufeldt
Patented Case
View Patent ↗
Granted: Feb 15, 2000
Filed: Nov 6, 1997
Inventor
Duane Mark Schufeldt
Assignee (at issue)
SHELL OIL 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.